TY  - JOUR
AU  - Prokić-Vidojević, Dragana
AU  - Glišić, Sandra B.
AU  - Pešić, Radojica
AU  - Orlović, Aleksandar M.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5184
AB  - Re/Pd-TiO2/SiO2 aerogel catalysts were synthesized by using a sol-gel method and supercritical drying in excess solvent and investigated in the reaction of hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Both Re/Pd catalysts, obtained with and without the use of mesitylene in the synthesis step, have shown increased conversions of up to 70 % in the desulphurization of 4,6-DMDBT, when compared to conventional Co/Mo hydroprocessing catalysts. This observation is of importance for conversion of highly refractory 4,6-DMDBT and hydroprocessing to produce ultra-low sulphur diesel fuels, ULSD. In order to quantify the extent of desulphurisation, which proceeds via a hydrogenation route, conversions of DBT and 4,6-DMDBT along with evolution of reaction products characteristic for the direct desulphurisation route and the hydrogenation route were monitored by using a gas chromatography–mass spectrometry (GC-MS) analytical technique. The reaction was performed at 630 K and 6 MPa in a batch catalytic reactor. The experimental results were used in the Hougen-Watson kinetic model describing DBT and 4,6-DMDBT desulphurisation on σ and τ active sites. Kinetic parameters of this complex catalytic kinetics were determined by using a Genetic Algorithm method and minimum deviation function. Values of calculated kinetic parameters and values of the ratio of 3-methylcyclohexyltoluene (MCHT and dimethyl biphenyl (DMBPH) expressed as the MCHT/(MCHT+DMBPH) ratio ranging between 0.66 and 0.94, have confirmed that the hydrogenation route is the dominant route for desulphurisation of 4,6-DMDBT.
PB  - Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling
T1  - Desulfurizacija dibenzotiofena i 4,6 – dimetildibenzotiofena procesom hidrogenovanja uz korišćenje RePd–TiO2/SiO2 aerogel katalizatora: proračun kinetičkih parametara i simulacijaprocesa
EP  - 145
IS  - 3
SP  - 135
VL  - 76
DO  - 10.2298/HEMIND220114008P
ER  - 

@article{
author = "Prokić-Vidojević, Dragana and Glišić, Sandra B. and Pešić, Radojica and Orlović, Aleksandar M.",
year = "2022",
abstract = "Re/Pd-TiO2/SiO2 aerogel catalysts were synthesized by using a sol-gel method and supercritical drying in excess solvent and investigated in the reaction of hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Both Re/Pd catalysts, obtained with and without the use of mesitylene in the synthesis step, have shown increased conversions of up to 70 % in the desulphurization of 4,6-DMDBT, when compared to conventional Co/Mo hydroprocessing catalysts. This observation is of importance for conversion of highly refractory 4,6-DMDBT and hydroprocessing to produce ultra-low sulphur diesel fuels, ULSD. In order to quantify the extent of desulphurisation, which proceeds via a hydrogenation route, conversions of DBT and 4,6-DMDBT along with evolution of reaction products characteristic for the direct desulphurisation route and the hydrogenation route were monitored by using a gas chromatography–mass spectrometry (GC-MS) analytical technique. The reaction was performed at 630 K and 6 MPa in a batch catalytic reactor. The experimental results were used in the Hougen-Watson kinetic model describing DBT and 4,6-DMDBT desulphurisation on σ and τ active sites. Kinetic parameters of this complex catalytic kinetics were determined by using a Genetic Algorithm method and minimum deviation function. Values of calculated kinetic parameters and values of the ratio of 3-methylcyclohexyltoluene (MCHT and dimethyl biphenyl (DMBPH) expressed as the MCHT/(MCHT+DMBPH) ratio ranging between 0.66 and 0.94, have confirmed that the hydrogenation route is the dominant route for desulphurisation of 4,6-DMDBT.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling, Desulfurizacija dibenzotiofena i 4,6 – dimetildibenzotiofena procesom hidrogenovanja uz korišćenje RePd–TiO2/SiO2 aerogel katalizatora: proračun kinetičkih parametara i simulacijaprocesa",
pages = "145-135",
number = "3",
volume = "76",
doi = "10.2298/HEMIND220114008P"
}

Prokić-Vidojević, D., Glišić, S. B., Pešić, R.,& Orlović, A. M.. (2022). Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling. in Hemijska industrija
Association of the Chemical Engineers of Serbia., 76(3), 135-145.
https://doi.org/10.2298/HEMIND220114008P

Prokić-Vidojević D, Glišić SB, Pešić R, Orlović AM. Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling. in Hemijska industrija. 2022;76(3):135-145.
doi:10.2298/HEMIND220114008P .

Prokić-Vidojević, Dragana, Glišić, Sandra B., Pešić, Radojica, Orlović, Aleksandar M., "Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling" in Hemijska industrija, 76, no. 3 (2022):135-145,
https://doi.org/10.2298/HEMIND220114008P . .

TY  - JOUR
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4849
AB  - Over the years, the hydrotreating process has been considerably improved in order to facilitate the production of environmentally friendly diesel fuels by reducing sulphur and aromatics concentrations, as mandated by contemporary emissions regulations. In this study, different kinetic models for the hydrodearomatisation reaction and the influence of reaction rate on performance of the industrial trickle bed reactor for hydrotreating of gas oil and light cycle oil fractions were analysed. The impact on reactor temperature, catalyst wetting efficiency, and conversion of sulphur and aromatics were determined. The results of simulations were compared with experimental data from an industrial test run and the best model for the observed process is proposed. Reactor performance and overall efficiency of the process is strongly dependent on the kinetics of hydrodearomatisaton with respect to aromatics conversion but even more so with respect to the temperature increase in the reactor, which affects all key catalytic reaction parameters, catalyst wetting efficiency, and thus the sulphur conversion. Based on the obtained simulation results, it could be concluded that reactor performance is strongly dependent on the hydrodearomatisation reaction. The best predictions of outlet temperature as well as sulphur and aromatic conversion (deviation from the experimental value 0.87 K, 0.01% and 2.57%, respectively) are achieved with the Langmuir-Hinshelwood kinetic model proposed by Owusu-Boakye.
T2  - Energies
T1  - The Influence of Hydrodearomatisation Reaction Kinetics on the Modelling of Sulphur and Aromatics Removal from Diesel Fuel in an Industrial Hydrotreating Process
IS  - 15
VL  - 14
DO  - 10.3390/en14154616
ER  - 

@article{
author = "Glišić, Sandra and Orlović, Aleksandar",
year = "2021",
abstract = "Over the years, the hydrotreating process has been considerably improved in order to facilitate the production of environmentally friendly diesel fuels by reducing sulphur and aromatics concentrations, as mandated by contemporary emissions regulations. In this study, different kinetic models for the hydrodearomatisation reaction and the influence of reaction rate on performance of the industrial trickle bed reactor for hydrotreating of gas oil and light cycle oil fractions were analysed. The impact on reactor temperature, catalyst wetting efficiency, and conversion of sulphur and aromatics were determined. The results of simulations were compared with experimental data from an industrial test run and the best model for the observed process is proposed. Reactor performance and overall efficiency of the process is strongly dependent on the kinetics of hydrodearomatisaton with respect to aromatics conversion but even more so with respect to the temperature increase in the reactor, which affects all key catalytic reaction parameters, catalyst wetting efficiency, and thus the sulphur conversion. Based on the obtained simulation results, it could be concluded that reactor performance is strongly dependent on the hydrodearomatisation reaction. The best predictions of outlet temperature as well as sulphur and aromatic conversion (deviation from the experimental value 0.87 K, 0.01% and 2.57%, respectively) are achieved with the Langmuir-Hinshelwood kinetic model proposed by Owusu-Boakye.",
journal = "Energies",
title = "The Influence of Hydrodearomatisation Reaction Kinetics on the Modelling of Sulphur and Aromatics Removal from Diesel Fuel in an Industrial Hydrotreating Process",
number = "15",
volume = "14",
doi = "10.3390/en14154616"
}

Glišić, S.,& Orlović, A.. (2021). The Influence of Hydrodearomatisation Reaction Kinetics on the Modelling of Sulphur and Aromatics Removal from Diesel Fuel in an Industrial Hydrotreating Process. in Energies, 14(15).
https://doi.org/10.3390/en14154616

Glišić S, Orlović A. The Influence of Hydrodearomatisation Reaction Kinetics on the Modelling of Sulphur and Aromatics Removal from Diesel Fuel in an Industrial Hydrotreating Process. in Energies. 2021;14(15).
doi:10.3390/en14154616 .

Glišić, Sandra, Orlović, Aleksandar, "The Influence of Hydrodearomatisation Reaction Kinetics on the Modelling of Sulphur and Aromatics Removal from Diesel Fuel in an Industrial Hydrotreating Process" in Energies, 14, no. 15 (2021),
https://doi.org/10.3390/en14154616 . .

TY  - JOUR
AU  - Prokić-Vidojević, Dragana
AU  - Glišić, Sandra
AU  - Krstić, Jugoslav B.
AU  - Orlović, Aleksandar
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4860
AB  - Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 aerogel catalysts were synthesized using sol-gel method and super-critical drying in excess solvent, and investigated in the hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). The influence of supercritical drying on the final catalytic properties of the materials was determined by parallel synthesis of aerogels and xerogels for Re/Pd-TiO2/SiO2 catalysts. The sol-gel method and supercritical drying were found to result in amorphous aerogels with relatively high degree of uniformity, of both supports and active phases. Corresponding xerogels were found to be similar to aerogels in terms of composition and structure, but characterized by lower specific surface areas. Catalytic activity of Co/Mo-Al2O3/SiO2 aerogel catalysts in HDS of DBT and 4,6-DMDBT has shown no major improvement in comparison to conventional Co/Mo catalyst. On the other hand, Re/Pd-TiO2/SiO2 aerogels, obtained with the addition of mesitylene or without it, achieved 70 % and 64 % higher conversion of 4,6-DMDBT than conventional Co/Mo catalyst, respectively. Increased catalytic activity can be attributed to well dispersed Re and Pd active phases across the catalyst structure, good incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas.
T2  - Catalysis Today
T1  - Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene
EP  - 23
SP  - 10
VL  - 378
DO  - 10.1016/j.cattod.2020.11.022
ER  - 

@article{
author = "Prokić-Vidojević, Dragana and Glišić, Sandra and Krstić, Jugoslav B. and Orlović, Aleksandar",
year = "2021",
abstract = "Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 aerogel catalysts were synthesized using sol-gel method and super-critical drying in excess solvent, and investigated in the hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). The influence of supercritical drying on the final catalytic properties of the materials was determined by parallel synthesis of aerogels and xerogels for Re/Pd-TiO2/SiO2 catalysts. The sol-gel method and supercritical drying were found to result in amorphous aerogels with relatively high degree of uniformity, of both supports and active phases. Corresponding xerogels were found to be similar to aerogels in terms of composition and structure, but characterized by lower specific surface areas. Catalytic activity of Co/Mo-Al2O3/SiO2 aerogel catalysts in HDS of DBT and 4,6-DMDBT has shown no major improvement in comparison to conventional Co/Mo catalyst. On the other hand, Re/Pd-TiO2/SiO2 aerogels, obtained with the addition of mesitylene or without it, achieved 70 % and 64 % higher conversion of 4,6-DMDBT than conventional Co/Mo catalyst, respectively. Increased catalytic activity can be attributed to well dispersed Re and Pd active phases across the catalyst structure, good incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas.",
journal = "Catalysis Today",
title = "Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene",
pages = "23-10",
volume = "378",
doi = "10.1016/j.cattod.2020.11.022"
}

Prokić-Vidojević, D., Glišić, S., Krstić, J. B.,& Orlović, A.. (2021). Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene. in Catalysis Today, 378, 10-23.
https://doi.org/10.1016/j.cattod.2020.11.022

Prokić-Vidojević D, Glišić S, Krstić JB, Orlović A. Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene. in Catalysis Today. 2021;378:10-23.
doi:10.1016/j.cattod.2020.11.022 .

Prokić-Vidojević, Dragana, Glišić, Sandra, Krstić, Jugoslav B., Orlović, Aleksandar, "Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene" in Catalysis Today, 378 (2021):10-23,
https://doi.org/10.1016/j.cattod.2020.11.022 . .

TY  - JOUR
AU  - Prokić-Vidojević, Dragana
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3533
AB  - Textural characteristics of catalysts and catalysts supports are of a prime importance when it comes to their application in processing of high molecular weight compounds. Drying procedure is a key factor in preservation of wet gel properties. Hexagonal mesoporous silicas (HMS) doped with Ti-ions is finding a promising usage as heterogeneous catalysts support. In this paper, the effect of supercritical drying with excess solvent on the textural characteristics of Ti- HMS is addressed. HMS with Ti ions (Si/Ti atomic ratio of 40) is prepared using the sol-gel method. Dodecylamine is used as the structure directing surfactant (S) and TEOS and Titanium butoxide as the inorganic precursors (I). Specific surface area, mesoporosity and pore volume of the support dried by thermal evaporation of solvent in air and dried in excess of supercritical ethanol are compared. The results indicate that improved specific surface area and almost four times bigger value for mesopore volume are obtained using supercritical drying procedure.
AB  - Teksturalne karakteristike katalizatora i nosača katalizatora su od izuzetne važnosti kad je u pitanju korišćenje katalizatora u procesima u kojima učestvuju jedinjenja velike molekulske mase. Način sušenja vlažnog gela igra značajnu ulogu u očuvanju njegovih karakteristika. Heksagonalna mezoporozna silika (HMS) sa jonima titanijuma sve se vise koristi kao nosač heterogenih katalizatora. U ovom radu je predstavljen uticaj sušenja u višku rastvarača u natkritičnim uslovima na teksturalne karakteristike Ti-HMS. HMS sa jonima Ti (Si/Ti atomskog odnosa 40) sintetisana je primenom sol-gel metode. Kao templejt za formiranje struktura korišćen je dodecilamin (S°), a kao neorganski prekursori (I°) tetraetilortosilikat (TEOS) i titanijum butoksid. Upoređene su specifična površina, mezoporoznost i zapremina pora nosača sušenog termičkom evaporacijom rastvarača u vazduhu i nosača sušenog u višku natkritičnog etanola. Rezultati pokazuju da je korišćenjem natkritičnog sušenja poboljšana vrednost specifične površine nosača i dobijena četiri puta veća vrednost zapremine mezopora.
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support
T1  - Vozdejstvie suški v izbytke sverhkritičeskogo rastvoritelja na teksturnye harakteristiki nositelja katalizatora Ti-HMS / (francuski) Influence du séchage dans l'excès du solvant supercritique sur les caractéristiques texturales du support de catalyseur Ti-HMS)
T1  - Uticaj sušenja u višku natkritičnog rastvarača na teksturalne karakteristike nosača katalizatora Ti-HMS
EP  - 28
IS  - 1
SP  - 21
VL  - 67
DO  - 10.5937/STR1701021P
ER  - 

@article{
author = "Prokić-Vidojević, Dragana and Glišić, Sandra and Orlović, Aleksandar",
year = "2017",
abstract = "Textural characteristics of catalysts and catalysts supports are of a prime importance when it comes to their application in processing of high molecular weight compounds. Drying procedure is a key factor in preservation of wet gel properties. Hexagonal mesoporous silicas (HMS) doped with Ti-ions is finding a promising usage as heterogeneous catalysts support. In this paper, the effect of supercritical drying with excess solvent on the textural characteristics of Ti- HMS is addressed. HMS with Ti ions (Si/Ti atomic ratio of 40) is prepared using the sol-gel method. Dodecylamine is used as the structure directing surfactant (S) and TEOS and Titanium butoxide as the inorganic precursors (I). Specific surface area, mesoporosity and pore volume of the support dried by thermal evaporation of solvent in air and dried in excess of supercritical ethanol are compared. The results indicate that improved specific surface area and almost four times bigger value for mesopore volume are obtained using supercritical drying procedure., Teksturalne karakteristike katalizatora i nosača katalizatora su od izuzetne važnosti kad je u pitanju korišćenje katalizatora u procesima u kojima učestvuju jedinjenja velike molekulske mase. Način sušenja vlažnog gela igra značajnu ulogu u očuvanju njegovih karakteristika. Heksagonalna mezoporozna silika (HMS) sa jonima titanijuma sve se vise koristi kao nosač heterogenih katalizatora. U ovom radu je predstavljen uticaj sušenja u višku rastvarača u natkritičnim uslovima na teksturalne karakteristike Ti-HMS. HMS sa jonima Ti (Si/Ti atomskog odnosa 40) sintetisana je primenom sol-gel metode. Kao templejt za formiranje struktura korišćen je dodecilamin (S°), a kao neorganski prekursori (I°) tetraetilortosilikat (TEOS) i titanijum butoksid. Upoređene su specifična površina, mezoporoznost i zapremina pora nosača sušenog termičkom evaporacijom rastvarača u vazduhu i nosača sušenog u višku natkritičnog etanola. Rezultati pokazuju da je korišćenjem natkritičnog sušenja poboljšana vrednost specifične površine nosača i dobijena četiri puta veća vrednost zapremine mezopora.",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support, Vozdejstvie suški v izbytke sverhkritičeskogo rastvoritelja na teksturnye harakteristiki nositelja katalizatora Ti-HMS / (francuski) Influence du séchage dans l'excès du solvant supercritique sur les caractéristiques texturales du support de catalyseur Ti-HMS), Uticaj sušenja u višku natkritičnog rastvarača na teksturalne karakteristike nosača katalizatora Ti-HMS",
pages = "28-21",
number = "1",
volume = "67",
doi = "10.5937/STR1701021P"
}

Prokić-Vidojević, D., Glišić, S.,& Orlović, A.. (2017). Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support. in Scientific Technical Review
Military Technical Institute, Belgrade., 67(1), 21-28.
https://doi.org/10.5937/STR1701021P

Prokić-Vidojević D, Glišić S, Orlović A. Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support. in Scientific Technical Review. 2017;67(1):21-28.
doi:10.5937/STR1701021P .

Prokić-Vidojević, Dragana, Glišić, Sandra, Orlović, Aleksandar, "Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support" in Scientific Technical Review, 67, no. 1 (2017):21-28,
https://doi.org/10.5937/STR1701021P . .

TY  - JOUR
AU  - Ćosović, Aleksandar
AU  - Žák, Tomáš
AU  - Glišić, Sandra
AU  - Sokić, Miroslav
AU  - Lazarević, Slavica
AU  - Ćosović, Vladan
AU  - Orlović, Aleksandar
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3262
AB  - Nano-crystalline nickel ferrite has a broad range of applications due to its favourable magnetic properties. Those characteristics can be significantly influenced by the synthesis pathway including methods conducted in the presence of supercritical alcohols. Nano-crystalline NiFe2O4 powders were obtained in the reaction under subcritical and supercritical conditions of ethanol. Both high pressure synthesis routes resulted in powders with smaller primary particles and higher mesoporosity than co-precipitation method. Upon the annealing treatment the average crystallite size increased while material structure remained uniform, resulting in significantly enhanced magnetic properties, such as coercivity and remanence. It was found that synthesis under supercritical conditions provides higher conversion but also material with larger average crystallite size upon annealing. The time and temperature of annealing stage significantly influenced the morphology and magnetic properties of the obtained powders.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol
EP  - 105
SP  - 96
VL  - 113
DO  - 10.1016/j.supflu.2016.03.014
ER  - 

@article{
author = "Ćosović, Aleksandar and Žák, Tomáš and Glišić, Sandra and Sokić, Miroslav and Lazarević, Slavica and Ćosović, Vladan and Orlović, Aleksandar",
year = "2016",
abstract = "Nano-crystalline nickel ferrite has a broad range of applications due to its favourable magnetic properties. Those characteristics can be significantly influenced by the synthesis pathway including methods conducted in the presence of supercritical alcohols. Nano-crystalline NiFe2O4 powders were obtained in the reaction under subcritical and supercritical conditions of ethanol. Both high pressure synthesis routes resulted in powders with smaller primary particles and higher mesoporosity than co-precipitation method. Upon the annealing treatment the average crystallite size increased while material structure remained uniform, resulting in significantly enhanced magnetic properties, such as coercivity and remanence. It was found that synthesis under supercritical conditions provides higher conversion but also material with larger average crystallite size upon annealing. The time and temperature of annealing stage significantly influenced the morphology and magnetic properties of the obtained powders.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol",
pages = "105-96",
volume = "113",
doi = "10.1016/j.supflu.2016.03.014"
}

Ćosović, A., Žák, T., Glišić, S., Sokić, M., Lazarević, S., Ćosović, V.,& Orlović, A.. (2016). Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol. in Journal of Supercritical Fluids
Elsevier Science Bv, Amsterdam., 113, 96-105.
https://doi.org/10.1016/j.supflu.2016.03.014

Ćosović A, Žák T, Glišić S, Sokić M, Lazarević S, Ćosović V, Orlović A. Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol. in Journal of Supercritical Fluids. 2016;113:96-105.
doi:10.1016/j.supflu.2016.03.014 .

Ćosović, Aleksandar, Žák, Tomáš, Glišić, Sandra, Sokić, Miroslav, Lazarević, Slavica, Ćosović, Vladan, Orlović, Aleksandar, "Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol" in Journal of Supercritical Fluids, 113 (2016):96-105,
https://doi.org/10.1016/j.supflu.2016.03.014 . .

TY  - JOUR
AU  - Glišić, Sandra
AU  - Pajnik, Jelena
AU  - Orlović, Aleksandar
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3448
AB  - Like ester type biodiesel fuel, green diesel is a next generation transportation fuel emerging due to the need for a renewable replacement of internal combustion engine fuel, which is also fully compatible with existing automotive powertrain systems. Besides other limitations, the main obstacle for wider application of such renewable fuels is their relatively high production cost, depending mainly on the raw material cost and the application of more efficient processing technology. Green diesel and ester type biodiesel can be produced from waste vegetable oil by catalytic hydrogenation, homogeneous alkali catalysed transesterification and supercritical non-catalytic transesterification. Techno-economic analysis and the sensitivity analysis reveal that economics of these production technologies strongly depend on the process unit capacity and the cost of feedstock. Green diesel production by catalytic hydroprocessing located in a petroleum refinery appears to be the most cost effective option for unit capacity close to and above 200,000 tonnes/year. Conventional ester biodiesel process and non-catalytic ester biodiesel process under supercritical conditions are less profitable at specified capacity. Unit capacities of the investigated processes which are below 100,000 tonnes/year are likely to result in negative net present values after 10 years of project lifetime.
PB  - Elsevier Sci Ltd, Oxford
T2  - Applied Energy
T1  - Process and techno-economic analysis of green diesel production from waste vegetable oil and the comparison with ester type biodiesel production
EP  - 185
SP  - 176
VL  - 170
DO  - 10.1016/j.apenergy.2016.02.102
ER  - 

@article{
author = "Glišić, Sandra and Pajnik, Jelena and Orlović, Aleksandar",
year = "2016",
abstract = "Like ester type biodiesel fuel, green diesel is a next generation transportation fuel emerging due to the need for a renewable replacement of internal combustion engine fuel, which is also fully compatible with existing automotive powertrain systems. Besides other limitations, the main obstacle for wider application of such renewable fuels is their relatively high production cost, depending mainly on the raw material cost and the application of more efficient processing technology. Green diesel and ester type biodiesel can be produced from waste vegetable oil by catalytic hydrogenation, homogeneous alkali catalysed transesterification and supercritical non-catalytic transesterification. Techno-economic analysis and the sensitivity analysis reveal that economics of these production technologies strongly depend on the process unit capacity and the cost of feedstock. Green diesel production by catalytic hydroprocessing located in a petroleum refinery appears to be the most cost effective option for unit capacity close to and above 200,000 tonnes/year. Conventional ester biodiesel process and non-catalytic ester biodiesel process under supercritical conditions are less profitable at specified capacity. Unit capacities of the investigated processes which are below 100,000 tonnes/year are likely to result in negative net present values after 10 years of project lifetime.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Applied Energy",
title = "Process and techno-economic analysis of green diesel production from waste vegetable oil and the comparison with ester type biodiesel production",
pages = "185-176",
volume = "170",
doi = "10.1016/j.apenergy.2016.02.102"
}

Glišić, S., Pajnik, J.,& Orlović, A.. (2016). Process and techno-economic analysis of green diesel production from waste vegetable oil and the comparison with ester type biodiesel production. in Applied Energy
Elsevier Sci Ltd, Oxford., 170, 176-185.
https://doi.org/10.1016/j.apenergy.2016.02.102

Glišić S, Pajnik J, Orlović A. Process and techno-economic analysis of green diesel production from waste vegetable oil and the comparison with ester type biodiesel production. in Applied Energy. 2016;170:176-185.
doi:10.1016/j.apenergy.2016.02.102 .

Glišić, Sandra, Pajnik, Jelena, Orlović, Aleksandar, "Process and techno-economic analysis of green diesel production from waste vegetable oil and the comparison with ester type biodiesel production" in Applied Energy, 170 (2016):176-185,
https://doi.org/10.1016/j.apenergy.2016.02.102 . .

TY  - JOUR
AU  - Naziri, Eleni
AU  - Glišić, Sandra
AU  - Mantzouridou, Fani
AU  - Tsimidou, Maria Z.
AU  - Nedović, Viktor
AU  - Bugarski, Branko
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3423
AB  - Utilization of wastes from winery industry seems to be a cost-effective and an environmental friendly investment. A number of valuable components can be recovered from winery wastes and specifically from wine lees like tartaric acid, b-1,3-glucans, squalene. The main goal of this study was to apply supercritical carbon dioxide (SCCO2) extraction for the isolation of squalene from wine lees. The samples were collected during the fractionation at 12-30 MPa under isothermal conditions at 40 degrees C to monitor the changes in the chemical composition and extract yield with respect to pressure and CO2 consumption. Using SCCO2, total squalene content in the extracts was found to be 16.9 g/kg, a value comparable to the one obtained by using ultrasound assisted extraction (20.4 g/kg hexane extract) or a reference method (acid assisted extraction using organic solvents) (17.6 g/kg). Examination of lipid composition by TLC verified the absence of squalene oxidation products in the extracts marked previously as a drawback of the other extraction techniques.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Advantages of supercritical fluid extraction for recovery of squalene from wine lees
EP  - 565
SP  - 560
VL  - 107
DO  - 10.1016/j.supflu.2015.07.014
ER  - 

@article{
author = "Naziri, Eleni and Glišić, Sandra and Mantzouridou, Fani and Tsimidou, Maria Z. and Nedović, Viktor and Bugarski, Branko",
year = "2016",
abstract = "Utilization of wastes from winery industry seems to be a cost-effective and an environmental friendly investment. A number of valuable components can be recovered from winery wastes and specifically from wine lees like tartaric acid, b-1,3-glucans, squalene. The main goal of this study was to apply supercritical carbon dioxide (SCCO2) extraction for the isolation of squalene from wine lees. The samples were collected during the fractionation at 12-30 MPa under isothermal conditions at 40 degrees C to monitor the changes in the chemical composition and extract yield with respect to pressure and CO2 consumption. Using SCCO2, total squalene content in the extracts was found to be 16.9 g/kg, a value comparable to the one obtained by using ultrasound assisted extraction (20.4 g/kg hexane extract) or a reference method (acid assisted extraction using organic solvents) (17.6 g/kg). Examination of lipid composition by TLC verified the absence of squalene oxidation products in the extracts marked previously as a drawback of the other extraction techniques.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Advantages of supercritical fluid extraction for recovery of squalene from wine lees",
pages = "565-560",
volume = "107",
doi = "10.1016/j.supflu.2015.07.014"
}

Naziri, E., Glišić, S., Mantzouridou, F., Tsimidou, M. Z., Nedović, V.,& Bugarski, B.. (2016). Advantages of supercritical fluid extraction for recovery of squalene from wine lees. in Journal of Supercritical Fluids
Elsevier Science Bv, Amsterdam., 107, 560-565.
https://doi.org/10.1016/j.supflu.2015.07.014

Naziri E, Glišić S, Mantzouridou F, Tsimidou MZ, Nedović V, Bugarski B. Advantages of supercritical fluid extraction for recovery of squalene from wine lees. in Journal of Supercritical Fluids. 2016;107:560-565.
doi:10.1016/j.supflu.2015.07.014 .

Naziri, Eleni, Glišić, Sandra, Mantzouridou, Fani, Tsimidou, Maria Z., Nedović, Viktor, Bugarski, Branko, "Advantages of supercritical fluid extraction for recovery of squalene from wine lees" in Journal of Supercritical Fluids, 107 (2016):560-565,
https://doi.org/10.1016/j.supflu.2015.07.014 . .

TY  - JOUR
AU  - Mijatović, Ivana M.
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2905
AB  - Many industrial scale trickle bed reactors (TBR) operate at lower liquid superficial velocities ( lt 0.5 cm/s) at which the catalyst particle are not completely wetted. This phenomenon of incomplete wetting has therefore received significant attention and numerous studies have addressed the influence of wetting on the overall rate, conversion/selectivity behavior, and heat effects in TBR. The incomplete wetting conditions correspond to stagnant liquid pockets due to lower liquid superficial velocity which could cause significant influence on reactor performances. In this paper, several models for wetting efficiency in TBR on industrial level are examined and influence on reaction rate and reactor performance is discussed.
AB  - Mnogi reaktori sa pakovanim slojem katalizatora (TBR) u industrijskim procesima za hidroobradu rade pri malim površinskim brzinama tečne faze ( lt 0,5 cm/s) pri čemu su čestice katalizatora samo delimično ovlažene. Ovaj fenomen delimične ovlaženosti katalizatora detaljno je ispitivan, kao i uticaj stepena ovlaženosti na brzine reakcija koje se odvijaju u procesu, na konverzije, selektivnost, i na porast temperature u reaktoru. U ovom radu upoređeni su rezultati nekoliko različitih modela za izračunavanje ovlaženosti u industrijskom reaktoru sa pakovanim slojem katalizatora, kao i uticaj ovlaženosti na brzine hemijskih reakcija i na rad industrijskog rektora.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Analysis of catalyst wetting efficiency influence on performances of industrial TBR for hydro desulfurization and hydro de aromatization reactions
T1  - Analiza uticaja ovlaženosti katalizatora u industrijskom TBR reaktoru na reakcije hidrodesulfurizacije i hidrodearomatizacije
EP  - 584
IS  - 4
SP  - 581
VL  - 70
DO  - 10.5937/tehnika1504581M
ER  - 

@article{
author = "Mijatović, Ivana M. and Glišić, Sandra and Orlović, Aleksandar",
year = "2015",
abstract = "Many industrial scale trickle bed reactors (TBR) operate at lower liquid superficial velocities ( lt 0.5 cm/s) at which the catalyst particle are not completely wetted. This phenomenon of incomplete wetting has therefore received significant attention and numerous studies have addressed the influence of wetting on the overall rate, conversion/selectivity behavior, and heat effects in TBR. The incomplete wetting conditions correspond to stagnant liquid pockets due to lower liquid superficial velocity which could cause significant influence on reactor performances. In this paper, several models for wetting efficiency in TBR on industrial level are examined and influence on reaction rate and reactor performance is discussed., Mnogi reaktori sa pakovanim slojem katalizatora (TBR) u industrijskim procesima za hidroobradu rade pri malim površinskim brzinama tečne faze ( lt 0,5 cm/s) pri čemu su čestice katalizatora samo delimično ovlažene. Ovaj fenomen delimične ovlaženosti katalizatora detaljno je ispitivan, kao i uticaj stepena ovlaženosti na brzine reakcija koje se odvijaju u procesu, na konverzije, selektivnost, i na porast temperature u reaktoru. U ovom radu upoređeni su rezultati nekoliko različitih modela za izračunavanje ovlaženosti u industrijskom reaktoru sa pakovanim slojem katalizatora, kao i uticaj ovlaženosti na brzine hemijskih reakcija i na rad industrijskog rektora.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Analysis of catalyst wetting efficiency influence on performances of industrial TBR for hydro desulfurization and hydro de aromatization reactions, Analiza uticaja ovlaženosti katalizatora u industrijskom TBR reaktoru na reakcije hidrodesulfurizacije i hidrodearomatizacije",
pages = "584-581",
number = "4",
volume = "70",
doi = "10.5937/tehnika1504581M"
}

Mijatović, I. M., Glišić, S.,& Orlović, A.. (2015). Analysis of catalyst wetting efficiency influence on performances of industrial TBR for hydro desulfurization and hydro de aromatization reactions. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 70(4), 581-584.
https://doi.org/10.5937/tehnika1504581M

Mijatović IM, Glišić S, Orlović A. Analysis of catalyst wetting efficiency influence on performances of industrial TBR for hydro desulfurization and hydro de aromatization reactions. in Tehnika. 2015;70(4):581-584.
doi:10.5937/tehnika1504581M .

Mijatović, Ivana M., Glišić, Sandra, Orlović, Aleksandar, "Analysis of catalyst wetting efficiency influence on performances of industrial TBR for hydro desulfurization and hydro de aromatization reactions" in Tehnika, 70, no. 4 (2015):581-584,
https://doi.org/10.5937/tehnika1504581M . .

TY  - JOUR
AU  - Almagrbi, Abdualnaser Muftah
AU  - Hatami, Tahmasb
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2635
AB  - This paper represents a methodology for kinetic parameter estimation based on standard optimization methods. The parameter estimation procedure is applied to the example of modelling of non-catalytic transesterification reaction, based on laboratory experiments performed under elevated pressure. The kinetic model employed in this study consists of three consecutive and parallel reversible reactions of the second order, with six kinetic constants. The influence of the mass transfer effects was considered as well. The best results were obtained by Genetic Algorithm method. The application of this method resulted in kinetic parameters with improved accuracy in predicting concentrations of important reaction intermediates, i.e., diglycerides and monoglycerides. Activation energies of kinetic parameters obtained by the Genetic Algorithm method are in line with theoretical values determined by molecular orbital calculations.
AB  - U ovom radu je predstavljena metodologija i rezultati određivanja kinetičkih parametara za složenu reakciju transesterifikacije korišćenjem standardnih optimizacionih metoda. Određivanje kinetičkih parametara različitim optimizacionim metodama izvedeno je za nekatalizovane reakcije transesterifikacije suncokretovog ulja sa metanolom. Reakcija je ispitivana eksperimentima u šaržnom reaktoru pod uslovima povišenog pritiska i temperature. Ova reakcija predstavlja jedan složen reakcioni sistem, kako sa aspekta kinetike hemijskih reakcija tako i sa aspekta ravnoteže faza i prenosa mase. Sistem je višekomponentni pri čemu se ukupni sastav znatno menja tokom reakcije, a u zavisnosti od temperature i pritiska, reakcioni sistem menja i broj i sastav faza u ravnoteži. Primenjeni kinetički model čini sistem od tri povratne uporedno-uzastopne reakcije drugogog reda. Pod uslovima pritiska i temperature ispitanim u ovom radu (150 °C i 1,1 MPa; 210 °C i 4,5 MPa), ovaj reakcioni sistem u početnoj fazi čine dve tečne faze u termodinamičkoj ravnoteži. Zbog ove činjenice u početnoj fazi reakcije u obzir je uzet i uticaj prenosa mase na kinetičke parametre. Tokom reakcije koju karakteriše nastajanje međuproizvoda, mono i diglicerida, dolazi do stvaranja mikroemulzije što je potvrđeno prethodnim istraživanjima. Stoga se ovakav sistem u naknadnoj fazi može smatrati uniformnim po celoj zapremini. Optimizacione metode primenjene u ovom radu zasnivaju se na primeni Levenberg-Marquardt logaritma, S/mulated Annel/ng i genetskog algoritma. Najbolji rezultati su dobijeni primenom genetskog algoritma, odnosno kinetički parametri dobijeni tim proračunom pokazuju najmanje odstupanje predviđanja koncentracija svih reaktanata i proizvoda u odnosu na eksperimentalne podatke. Primenom optimizacionih metoda na ovako složen sistem moguće je dobiti bolje predviđanje koncentracija intermedijera u odnosu na druge metode koje se mogu naći u literaturi. Takođe, postoje razlike u kvalitetu rešenja dobijenim različitim optimizacionim metodama. Kinetički parametri dobijeni primenom Levenberg-Marquardt algoritma dobro numerički opisuju realni sistem ali vrednosti kinetičkih parametara ne odgovaraju teoretskim vrednostima koje se očekuju na osnovu mehanizma reakcije. Sa druge strane, vrednosti energija aktivacije ove složene reakcije koje su dobijene primenom genetskog algoritma, u veoma su dobrom slaganju sa vrednostima energija aktivacije koje su dobijene proračunom molekulskih orbitala.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Determination of kinetic parameters for complex transesterification reaction by standard optimisation methods
T1  - Određivanje kinetičkih parametara složene reakcije transesterifikacije primenom standardnih optimizacionih metoda
EP  - 159
IS  - 2
SP  - 149
VL  - 68
DO  - 10.2298/HEMIND130118037A
ER  - 

@article{
author = "Almagrbi, Abdualnaser Muftah and Hatami, Tahmasb and Glišić, Sandra and Orlović, Aleksandar",
year = "2014",
abstract = "This paper represents a methodology for kinetic parameter estimation based on standard optimization methods. The parameter estimation procedure is applied to the example of modelling of non-catalytic transesterification reaction, based on laboratory experiments performed under elevated pressure. The kinetic model employed in this study consists of three consecutive and parallel reversible reactions of the second order, with six kinetic constants. The influence of the mass transfer effects was considered as well. The best results were obtained by Genetic Algorithm method. The application of this method resulted in kinetic parameters with improved accuracy in predicting concentrations of important reaction intermediates, i.e., diglycerides and monoglycerides. Activation energies of kinetic parameters obtained by the Genetic Algorithm method are in line with theoretical values determined by molecular orbital calculations., U ovom radu je predstavljena metodologija i rezultati određivanja kinetičkih parametara za složenu reakciju transesterifikacije korišćenjem standardnih optimizacionih metoda. Određivanje kinetičkih parametara različitim optimizacionim metodama izvedeno je za nekatalizovane reakcije transesterifikacije suncokretovog ulja sa metanolom. Reakcija je ispitivana eksperimentima u šaržnom reaktoru pod uslovima povišenog pritiska i temperature. Ova reakcija predstavlja jedan složen reakcioni sistem, kako sa aspekta kinetike hemijskih reakcija tako i sa aspekta ravnoteže faza i prenosa mase. Sistem je višekomponentni pri čemu se ukupni sastav znatno menja tokom reakcije, a u zavisnosti od temperature i pritiska, reakcioni sistem menja i broj i sastav faza u ravnoteži. Primenjeni kinetički model čini sistem od tri povratne uporedno-uzastopne reakcije drugogog reda. Pod uslovima pritiska i temperature ispitanim u ovom radu (150 °C i 1,1 MPa; 210 °C i 4,5 MPa), ovaj reakcioni sistem u početnoj fazi čine dve tečne faze u termodinamičkoj ravnoteži. Zbog ove činjenice u početnoj fazi reakcije u obzir je uzet i uticaj prenosa mase na kinetičke parametre. Tokom reakcije koju karakteriše nastajanje međuproizvoda, mono i diglicerida, dolazi do stvaranja mikroemulzije što je potvrđeno prethodnim istraživanjima. Stoga se ovakav sistem u naknadnoj fazi može smatrati uniformnim po celoj zapremini. Optimizacione metode primenjene u ovom radu zasnivaju se na primeni Levenberg-Marquardt logaritma, S/mulated Annel/ng i genetskog algoritma. Najbolji rezultati su dobijeni primenom genetskog algoritma, odnosno kinetički parametri dobijeni tim proračunom pokazuju najmanje odstupanje predviđanja koncentracija svih reaktanata i proizvoda u odnosu na eksperimentalne podatke. Primenom optimizacionih metoda na ovako složen sistem moguće je dobiti bolje predviđanje koncentracija intermedijera u odnosu na druge metode koje se mogu naći u literaturi. Takođe, postoje razlike u kvalitetu rešenja dobijenim različitim optimizacionim metodama. Kinetički parametri dobijeni primenom Levenberg-Marquardt algoritma dobro numerički opisuju realni sistem ali vrednosti kinetičkih parametara ne odgovaraju teoretskim vrednostima koje se očekuju na osnovu mehanizma reakcije. Sa druge strane, vrednosti energija aktivacije ove složene reakcije koje su dobijene primenom genetskog algoritma, u veoma su dobrom slaganju sa vrednostima energija aktivacije koje su dobijene proračunom molekulskih orbitala.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Determination of kinetic parameters for complex transesterification reaction by standard optimisation methods, Određivanje kinetičkih parametara složene reakcije transesterifikacije primenom standardnih optimizacionih metoda",
pages = "159-149",
number = "2",
volume = "68",
doi = "10.2298/HEMIND130118037A"
}

Almagrbi, A. M., Hatami, T., Glišić, S.,& Orlović, A.. (2014). Determination of kinetic parameters for complex transesterification reaction by standard optimisation methods. in Hemijska industrija
Association of Chemical Engineers of Serbia., 68(2), 149-159.
https://doi.org/10.2298/HEMIND130118037A

Almagrbi AM, Hatami T, Glišić S, Orlović A. Determination of kinetic parameters for complex transesterification reaction by standard optimisation methods. in Hemijska industrija. 2014;68(2):149-159.
doi:10.2298/HEMIND130118037A .

Almagrbi, Abdualnaser Muftah, Hatami, Tahmasb, Glišić, Sandra, Orlović, Aleksandar, "Determination of kinetic parameters for complex transesterification reaction by standard optimisation methods" in Hemijska industrija, 68, no. 2 (2014):149-159,
https://doi.org/10.2298/HEMIND130118037A . .

TY  - JOUR
AU  - Mijatović, Ivana M.
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2722
AB  - Reducing the sulfur content of diesel fuels may require adjusted operation of low-pressure hydrotreater units. A mathematical model for co-hydrotreating of straight run gas oil blended with fluid catalytic cracking naphtha and light cycle oil was developed using an axial distribution of phase equilibrium and effective wetting in the catalytic reactor. The model assumes that hydrodesulfurization (HDS) and hydrodearomatization reactions occur on the catalyst surface which is in contact with the vapor or liquid phase. Kinetic equations of HougenWatson type were used to describe HDS reactions for different classes of sulfur compounds. Model results were validated using the industrial test run data, and very good predictions of overall sulfur conversion and reactor temperature were obtained. Simulations of reactor operation at different pressures, temperatures, and H-2 purities confirm that reaction pressures of around 100 bar and high-purity hydrogen streams are required for almost complete removal of sulfur compounds.
PB  - Amer Chemical Soc, Washington
T2  - Industrial & Engineering Chemistry Research
T1  - Modeling a Catalytic Reactor for Hydrotreating of Straight-Run Gas Oil Blended with Fluid Catalytic Cracking Naphtha and Light Cycle Oil: Influence of Vapor-Liquid Equilibrium
EP  - 19116
IS  - 49
SP  - 19104
VL  - 53
DO  - 10.1021/ie503188p
ER  - 

@article{
author = "Mijatović, Ivana M. and Glišić, Sandra and Orlović, Aleksandar",
year = "2014",
abstract = "Reducing the sulfur content of diesel fuels may require adjusted operation of low-pressure hydrotreater units. A mathematical model for co-hydrotreating of straight run gas oil blended with fluid catalytic cracking naphtha and light cycle oil was developed using an axial distribution of phase equilibrium and effective wetting in the catalytic reactor. The model assumes that hydrodesulfurization (HDS) and hydrodearomatization reactions occur on the catalyst surface which is in contact with the vapor or liquid phase. Kinetic equations of HougenWatson type were used to describe HDS reactions for different classes of sulfur compounds. Model results were validated using the industrial test run data, and very good predictions of overall sulfur conversion and reactor temperature were obtained. Simulations of reactor operation at different pressures, temperatures, and H-2 purities confirm that reaction pressures of around 100 bar and high-purity hydrogen streams are required for almost complete removal of sulfur compounds.",
publisher = "Amer Chemical Soc, Washington",
journal = "Industrial & Engineering Chemistry Research",
title = "Modeling a Catalytic Reactor for Hydrotreating of Straight-Run Gas Oil Blended with Fluid Catalytic Cracking Naphtha and Light Cycle Oil: Influence of Vapor-Liquid Equilibrium",
pages = "19116-19104",
number = "49",
volume = "53",
doi = "10.1021/ie503188p"
}

Mijatović, I. M., Glišić, S.,& Orlović, A.. (2014). Modeling a Catalytic Reactor for Hydrotreating of Straight-Run Gas Oil Blended with Fluid Catalytic Cracking Naphtha and Light Cycle Oil: Influence of Vapor-Liquid Equilibrium. in Industrial & Engineering Chemistry Research
Amer Chemical Soc, Washington., 53(49), 19104-19116.
https://doi.org/10.1021/ie503188p

Mijatović IM, Glišić S, Orlović A. Modeling a Catalytic Reactor for Hydrotreating of Straight-Run Gas Oil Blended with Fluid Catalytic Cracking Naphtha and Light Cycle Oil: Influence of Vapor-Liquid Equilibrium. in Industrial & Engineering Chemistry Research. 2014;53(49):19104-19116.
doi:10.1021/ie503188p .

Mijatović, Ivana M., Glišić, Sandra, Orlović, Aleksandar, "Modeling a Catalytic Reactor for Hydrotreating of Straight-Run Gas Oil Blended with Fluid Catalytic Cracking Naphtha and Light Cycle Oil: Influence of Vapor-Liquid Equilibrium" in Industrial & Engineering Chemistry Research, 53, no. 49 (2014):19104-19116,
https://doi.org/10.1021/ie503188p . .

TY  - JOUR
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2776
AB  - The synthesis of biodiesel under elevated pressure and temperature could be promising technology which could result in sustainable biodiesel production, from renewable and waste streams like waste oil or used frying oil, thereby having no impact on biodiversity and the environment. This paper is comprehensive review of biodiesel synthesis from waste oil under elevated pressure and temperature: the supercritical or subcritical conditions of alcohol, with or without the use of heterogeneous catalyst. The review compromises the thermodynamic data, phase equilibria, phase composition and distribution during reaction, kinetic parameters and kinetic modeling, are presented. This type of data is necessary for process design and optimization. Process economics is analyzed and the impact of different production parameters (feedstock type, process parameters as temperature, pressure and alcohol to oil ratio, and different technology) is summarized and discussed.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Renewable & Sustainable Energy Reviews
T1  - Review of biodiesel synthesis from waste oil under elevated pressure and temperature: Phase equilibrium, reaction kinetics, process design and techno-economic study
EP  - 725
SP  - 708
VL  - 31
DO  - 10.1016/j.rser.2013.12.003
ER  - 

@article{
author = "Glišić, Sandra and Orlović, Aleksandar",
year = "2014",
abstract = "The synthesis of biodiesel under elevated pressure and temperature could be promising technology which could result in sustainable biodiesel production, from renewable and waste streams like waste oil or used frying oil, thereby having no impact on biodiversity and the environment. This paper is comprehensive review of biodiesel synthesis from waste oil under elevated pressure and temperature: the supercritical or subcritical conditions of alcohol, with or without the use of heterogeneous catalyst. The review compromises the thermodynamic data, phase equilibria, phase composition and distribution during reaction, kinetic parameters and kinetic modeling, are presented. This type of data is necessary for process design and optimization. Process economics is analyzed and the impact of different production parameters (feedstock type, process parameters as temperature, pressure and alcohol to oil ratio, and different technology) is summarized and discussed.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Renewable & Sustainable Energy Reviews",
title = "Review of biodiesel synthesis from waste oil under elevated pressure and temperature: Phase equilibrium, reaction kinetics, process design and techno-economic study",
pages = "725-708",
volume = "31",
doi = "10.1016/j.rser.2013.12.003"
}

Glišić, S.,& Orlović, A.. (2014). Review of biodiesel synthesis from waste oil under elevated pressure and temperature: Phase equilibrium, reaction kinetics, process design and techno-economic study. in Renewable & Sustainable Energy Reviews
Pergamon-Elsevier Science Ltd, Oxford., 31, 708-725.
https://doi.org/10.1016/j.rser.2013.12.003

Glišić S, Orlović A. Review of biodiesel synthesis from waste oil under elevated pressure and temperature: Phase equilibrium, reaction kinetics, process design and techno-economic study. in Renewable & Sustainable Energy Reviews. 2014;31:708-725.
doi:10.1016/j.rser.2013.12.003 .

Glišić, Sandra, Orlović, Aleksandar, "Review of biodiesel synthesis from waste oil under elevated pressure and temperature: Phase equilibrium, reaction kinetics, process design and techno-economic study" in Renewable & Sustainable Energy Reviews, 31 (2014):708-725,
https://doi.org/10.1016/j.rser.2013.12.003 . .

TY  - CHAP
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2271
AB  - St. John's Wort (Hypericum perforatum L.) has been widely used as an anti-inflammatory and healing agent in traditional medicine. Some para-pharmaceutical products, prepared from the extract of St. John's Wort, are frequently used because of their anti-depressive and antiviral properties. Moreover, the extract prepared from St. John's Wort (H. perforatum L.) has been also reported to have an antimicrobial, anti-inflammatory, and healing effect. Thus, extraction of a specific component from St. John's Wort which gives a high yield of total extract and high content of desired pharmacological active compounds is obviously in focus of many research activities today. Despite the evident clinical effects, there is still a controversy regarding the active principle of the extracts. Some authors attribute the antidepressant activity to hypericin and its derivatives, whereas, other studies are in the favor of hyperforin. Hyperforin, as a phloroglucinol derivative is a relatively lipophilic compound which is susceptible to rapid thermal, light-induced and oxidative decomposition. Adhyperforin presents its methyl derivative. The supercritical fluid extraction (SFE) is an outstanding method for the extraction of natural agents and valuable components from plant materials, because heat-sensitive compounds can be extracted without any degradation, and in addition, it is an environmentally acceptable technology. Supercritical carbon dioxide (SCCO2) is the most useful supercritical fluid in the food industry, because it is non-toxic, non-explosive, and available in high (food grade) purity and can be removed from the extracted products without leaving any residue. The main goal of this study was oriented to the investigation of process optimization of the best extraction method applicable to intergradient in food and pharmaceutical industry - supercritical fluid extraction as well as the antimicrobial activity of obtained extracts. The first part of study will represent the literature review of St. John's Wort occurrence in nature, their health effects and medical and pharmaceutical use.
T2  - Phytochemicals: Occurrence in Nature, Health Effects and Antioxidant Properties
T1  - Supercritical extraction of phloroglucinols from St. John's wort (Hypericum Perforatum L.) - Process optimization, mathematical modeling and antimicrobial activity
EP  - 146
SP  - 121
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2271
ER  - 

@inbook{
author = "Glišić, Sandra and Orlović, Aleksandar",
year = "2013",
abstract = "St. John's Wort (Hypericum perforatum L.) has been widely used as an anti-inflammatory and healing agent in traditional medicine. Some para-pharmaceutical products, prepared from the extract of St. John's Wort, are frequently used because of their anti-depressive and antiviral properties. Moreover, the extract prepared from St. John's Wort (H. perforatum L.) has been also reported to have an antimicrobial, anti-inflammatory, and healing effect. Thus, extraction of a specific component from St. John's Wort which gives a high yield of total extract and high content of desired pharmacological active compounds is obviously in focus of many research activities today. Despite the evident clinical effects, there is still a controversy regarding the active principle of the extracts. Some authors attribute the antidepressant activity to hypericin and its derivatives, whereas, other studies are in the favor of hyperforin. Hyperforin, as a phloroglucinol derivative is a relatively lipophilic compound which is susceptible to rapid thermal, light-induced and oxidative decomposition. Adhyperforin presents its methyl derivative. The supercritical fluid extraction (SFE) is an outstanding method for the extraction of natural agents and valuable components from plant materials, because heat-sensitive compounds can be extracted without any degradation, and in addition, it is an environmentally acceptable technology. Supercritical carbon dioxide (SCCO2) is the most useful supercritical fluid in the food industry, because it is non-toxic, non-explosive, and available in high (food grade) purity and can be removed from the extracted products without leaving any residue. The main goal of this study was oriented to the investigation of process optimization of the best extraction method applicable to intergradient in food and pharmaceutical industry - supercritical fluid extraction as well as the antimicrobial activity of obtained extracts. The first part of study will represent the literature review of St. John's Wort occurrence in nature, their health effects and medical and pharmaceutical use.",
journal = "Phytochemicals: Occurrence in Nature, Health Effects and Antioxidant Properties",
booktitle = "Supercritical extraction of phloroglucinols from St. John's wort (Hypericum Perforatum L.) - Process optimization, mathematical modeling and antimicrobial activity",
pages = "146-121",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2271"
}

Glišić, S.,& Orlović, A.. (2013). Supercritical extraction of phloroglucinols from St. John's wort (Hypericum Perforatum L.) - Process optimization, mathematical modeling and antimicrobial activity. in Phytochemicals: Occurrence in Nature, Health Effects and Antioxidant Properties, 121-146.
https://hdl.handle.net/21.15107/rcub_technorep_2271

Glišić S, Orlović A. Supercritical extraction of phloroglucinols from St. John's wort (Hypericum Perforatum L.) - Process optimization, mathematical modeling and antimicrobial activity. in Phytochemicals: Occurrence in Nature, Health Effects and Antioxidant Properties. 2013;:121-146.
https://hdl.handle.net/21.15107/rcub_technorep_2271 .

Glišić, Sandra, Orlović, Aleksandar, "Supercritical extraction of phloroglucinols from St. John's wort (Hypericum Perforatum L.) - Process optimization, mathematical modeling and antimicrobial activity" in Phytochemicals: Occurrence in Nature, Health Effects and Antioxidant Properties (2013):121-146,
https://hdl.handle.net/21.15107/rcub_technorep_2271 .

TY  - JOUR
AU  - Dukanović, Zoran
AU  - Glišić, Sandra
AU  - Jancić-Cobanin, Vesna
AU  - Niciforović, Miroslav
AU  - Georgiou, Constantinos A.
AU  - Orlović, Aleksandar
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2486
AB  - In order to expand diesel fuel processing capacity an option to co-hydrotreat straight run gas oil blended with fraction containing FCC naphtha and light cycle oil was investigated. Industrial test run was performed under pressure of 40 bar in the catalytic reactor with two layers of conventional Co-Mo/gamma-Al2O3 catalyst, by increasing volume content of FCC naphtha and light cycle oil fraction in the reactor inlet to 20%vol. Reactor inlet temperature was also increased during the test run from 327 to 334 degrees C. Liquid hourly space velocities between 1.05 and 1.32 h(-1) have been used with H-2/oil ratios of 908-1135 Nm(3) hydrogen/m(3) oil. Sulphur inlet concentrations of 6500-8200 ppm were reduced to 36-72 ppm in the hydrotreated oil. GC-MS analysis of the sulphur compound's sub-families has shown that most of the sulphur was present in more reactive classes like alkyl substituted benzothiophenes. High conversion of sulphur was achieved by a combination of the following process parameters: high reaction temperature, low space velocity, presence of FCC naphtha in the feed and distribution of inlet sulphur dominantly concentrated in more reactive benzothiophenes. The activation energy of 33.2 kcal/mol was determined for this type of feedstock using power law kinetic expression.
PB  - Elsevier Science Bv, Amsterdam
T2  - Fuel Processing Technology
T1  - Hydrotreating of straight-run gas oil blended with FCC naphtha and light cycle oil
EP  - 165
SP  - 160
VL  - 106
DO  - 10.1016/j.fuproc.2012.07.018
ER  - 

@article{
author = "Dukanović, Zoran and Glišić, Sandra and Jancić-Cobanin, Vesna and Niciforović, Miroslav and Georgiou, Constantinos A. and Orlović, Aleksandar",
year = "2013",
abstract = "In order to expand diesel fuel processing capacity an option to co-hydrotreat straight run gas oil blended with fraction containing FCC naphtha and light cycle oil was investigated. Industrial test run was performed under pressure of 40 bar in the catalytic reactor with two layers of conventional Co-Mo/gamma-Al2O3 catalyst, by increasing volume content of FCC naphtha and light cycle oil fraction in the reactor inlet to 20%vol. Reactor inlet temperature was also increased during the test run from 327 to 334 degrees C. Liquid hourly space velocities between 1.05 and 1.32 h(-1) have been used with H-2/oil ratios of 908-1135 Nm(3) hydrogen/m(3) oil. Sulphur inlet concentrations of 6500-8200 ppm were reduced to 36-72 ppm in the hydrotreated oil. GC-MS analysis of the sulphur compound's sub-families has shown that most of the sulphur was present in more reactive classes like alkyl substituted benzothiophenes. High conversion of sulphur was achieved by a combination of the following process parameters: high reaction temperature, low space velocity, presence of FCC naphtha in the feed and distribution of inlet sulphur dominantly concentrated in more reactive benzothiophenes. The activation energy of 33.2 kcal/mol was determined for this type of feedstock using power law kinetic expression.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Fuel Processing Technology",
title = "Hydrotreating of straight-run gas oil blended with FCC naphtha and light cycle oil",
pages = "165-160",
volume = "106",
doi = "10.1016/j.fuproc.2012.07.018"
}

Dukanović, Z., Glišić, S., Jancić-Cobanin, V., Niciforović, M., Georgiou, C. A.,& Orlović, A.. (2013). Hydrotreating of straight-run gas oil blended with FCC naphtha and light cycle oil. in Fuel Processing Technology
Elsevier Science Bv, Amsterdam., 106, 160-165.
https://doi.org/10.1016/j.fuproc.2012.07.018

Dukanović Z, Glišić S, Jancić-Cobanin V, Niciforović M, Georgiou CA, Orlović A. Hydrotreating of straight-run gas oil blended with FCC naphtha and light cycle oil. in Fuel Processing Technology. 2013;106:160-165.
doi:10.1016/j.fuproc.2012.07.018 .

Dukanović, Zoran, Glišić, Sandra, Jancić-Cobanin, Vesna, Niciforović, Miroslav, Georgiou, Constantinos A., Orlović, Aleksandar, "Hydrotreating of straight-run gas oil blended with FCC naphtha and light cycle oil" in Fuel Processing Technology, 106 (2013):160-165,
https://doi.org/10.1016/j.fuproc.2012.07.018 . .

TY  - JOUR
AU  - Lukić, Jelena M.
AU  - Nikolić, Draginja
AU  - Mandić, Valentina
AU  - Glišić, Sandra
AU  - Antonović, Dušan
AU  - Orlović, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2205
AB  - Copper sulfide deposits in the insulation systems of power transformers decrease the dielectric properties of the insulation and therefore constitute a significant risk for the operation of power transformers. Disulfides, oxidized sulfur compounds, thiols, and elemental sulfur, which could be present in insulating oil, have been recognized as the sources of reactive sulfur responsible for copper sulfide formation. Selective liquid liquid extraction using N-methyl-2-pyrrolidone solvent was investigated for the purification of mineral insulating oils through the removal of compounds and precursors responsible for copper sulfide formation. The efficiency of the extraction process was evaluated using corrosive sulfur test IEC 62535, SEM/EDX measurements of paper before and after the IEC 62535 test, and measurements of the dibenzyl disulfide concentration in the oil using GC-ECD method. The oxidation stability of refined oils was evaluated using the IEC 61125 method. Precursors of copper sulfide deposits were completely removed from different mineral oils as a result of purification by extraction with N-methyl-2-pyrrolidone and 1.0 wt % water as a cosolvent.
PB  - Amer Chemical Soc, Washington
T2  - Industrial & Engineering Chemistry Research
T1  - Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone
EP  - 4477
IS  - 12
SP  - 4472
VL  - 51
DO  - 10.1021/ie300450e
ER  - 

@article{
author = "Lukić, Jelena M. and Nikolić, Draginja and Mandić, Valentina and Glišić, Sandra and Antonović, Dušan and Orlović, Aleksandar",
year = "2012",
abstract = "Copper sulfide deposits in the insulation systems of power transformers decrease the dielectric properties of the insulation and therefore constitute a significant risk for the operation of power transformers. Disulfides, oxidized sulfur compounds, thiols, and elemental sulfur, which could be present in insulating oil, have been recognized as the sources of reactive sulfur responsible for copper sulfide formation. Selective liquid liquid extraction using N-methyl-2-pyrrolidone solvent was investigated for the purification of mineral insulating oils through the removal of compounds and precursors responsible for copper sulfide formation. The efficiency of the extraction process was evaluated using corrosive sulfur test IEC 62535, SEM/EDX measurements of paper before and after the IEC 62535 test, and measurements of the dibenzyl disulfide concentration in the oil using GC-ECD method. The oxidation stability of refined oils was evaluated using the IEC 61125 method. Precursors of copper sulfide deposits were completely removed from different mineral oils as a result of purification by extraction with N-methyl-2-pyrrolidone and 1.0 wt % water as a cosolvent.",
publisher = "Amer Chemical Soc, Washington",
journal = "Industrial & Engineering Chemistry Research",
title = "Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone",
pages = "4477-4472",
number = "12",
volume = "51",
doi = "10.1021/ie300450e"
}

Lukić, J. M., Nikolić, D., Mandić, V., Glišić, S., Antonović, D.,& Orlović, A.. (2012). Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone. in Industrial & Engineering Chemistry Research
Amer Chemical Soc, Washington., 51(12), 4472-4477.
https://doi.org/10.1021/ie300450e

Lukić JM, Nikolić D, Mandić V, Glišić S, Antonović D, Orlović A. Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone. in Industrial & Engineering Chemistry Research. 2012;51(12):4472-4477.
doi:10.1021/ie300450e .

Lukić, Jelena M., Nikolić, Draginja, Mandić, Valentina, Glišić, Sandra, Antonović, Dušan, Orlović, Aleksandar, "Removal of Sulfur Compounds from Mineral Insulating Oils by Extractive Refining with N-Methyl-2-pyrrolidone" in Industrial & Engineering Chemistry Research, 51, no. 12 (2012):4472-4477,
https://doi.org/10.1021/ie300450e . .

TY  - JOUR
AU  - Almagrbi, Abdualnaser Muftah
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2233
AB  - Biodiesel synthesis by ethanolysis of triglycerides conducted under high pressure and at elevated temperature can lead to high levels of conversion and biodiesel yield over short reaction time. The vapour-liquid or vapour-liquid-liquid equilibrium and phase distribution of ethanol and triolein were investigated in order to determine the range of pressure and temperature required for high oil conversion. The phase equilibrium of the triolein and ethanol mixture (1:40 and 1:26 molar ratio of triolein to ethanol) was monitored in a view cell in order to determine the phase transition during heating of mixture up to 195 degrees C (the corresponding pressure was 25 and 26 bar). The experimental data were simulated using ASPENplus (R) and UniSim (R) software and results obtained using RK-Aspen EOS were found to correlate well with the experimental data. Simulation results show the important influence of the phase equilibrium on the reaction mechanism and overall kinetics under subcritical conditions (T lt  270 degrees C at 200 bar) since the two liquid phases exist at the beginning of reaction, thereby limiting the contact between the reactants. In case of single reaction phase (T gt  270 degrees C at 200 bar) the initially high reaction rate is limited at high conversion levels due to increasing extent of reversible reaction.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - The phase equilibrium of triglycerides and ethanol at high pressure and temperature: The influence on kinetics of ethanolysis
EP  - 8
SP  - 2
VL  - 61
DO  - 10.1016/j.supflu.2011.10.002
ER  - 

@article{
author = "Almagrbi, Abdualnaser Muftah and Glišić, Sandra and Orlović, Aleksandar",
year = "2012",
abstract = "Biodiesel synthesis by ethanolysis of triglycerides conducted under high pressure and at elevated temperature can lead to high levels of conversion and biodiesel yield over short reaction time. The vapour-liquid or vapour-liquid-liquid equilibrium and phase distribution of ethanol and triolein were investigated in order to determine the range of pressure and temperature required for high oil conversion. The phase equilibrium of the triolein and ethanol mixture (1:40 and 1:26 molar ratio of triolein to ethanol) was monitored in a view cell in order to determine the phase transition during heating of mixture up to 195 degrees C (the corresponding pressure was 25 and 26 bar). The experimental data were simulated using ASPENplus (R) and UniSim (R) software and results obtained using RK-Aspen EOS were found to correlate well with the experimental data. Simulation results show the important influence of the phase equilibrium on the reaction mechanism and overall kinetics under subcritical conditions (T lt  270 degrees C at 200 bar) since the two liquid phases exist at the beginning of reaction, thereby limiting the contact between the reactants. In case of single reaction phase (T gt  270 degrees C at 200 bar) the initially high reaction rate is limited at high conversion levels due to increasing extent of reversible reaction.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "The phase equilibrium of triglycerides and ethanol at high pressure and temperature: The influence on kinetics of ethanolysis",
pages = "8-2",
volume = "61",
doi = "10.1016/j.supflu.2011.10.002"
}

Almagrbi, A. M., Glišić, S.,& Orlović, A.. (2012). The phase equilibrium of triglycerides and ethanol at high pressure and temperature: The influence on kinetics of ethanolysis. in Journal of Supercritical Fluids
Elsevier Science Bv, Amsterdam., 61, 2-8.
https://doi.org/10.1016/j.supflu.2011.10.002

Almagrbi AM, Glišić S, Orlović A. The phase equilibrium of triglycerides and ethanol at high pressure and temperature: The influence on kinetics of ethanolysis. in Journal of Supercritical Fluids. 2012;61:2-8.
doi:10.1016/j.supflu.2011.10.002 .

Almagrbi, Abdualnaser Muftah, Glišić, Sandra, Orlović, Aleksandar, "The phase equilibrium of triglycerides and ethanol at high pressure and temperature: The influence on kinetics of ethanolysis" in Journal of Supercritical Fluids, 61 (2012):2-8,
https://doi.org/10.1016/j.supflu.2011.10.002 . .

TY  - JOUR
AU  - Hatami, Tahmasb
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2195
AB  - Modelling and optimization of the extraction of St. John's Wort using supercritical fluid is the subject of this study. Applying conservation of mass, two partial differential equations were written for solute concentration in both solvent and solid phase. The equilibrium constant of St. John's Wort extract between solid and solvent phase was determined using genetic algorithm optimization technique. The differential equations were solved using numerical techniques simultaneously and were compared with experimental data. The results showed a good agreement between model results and experimental data. Simulation and optimization according to genetic algorithm have shown that 313 K and 20 MPa were the optimum temperature and pressure for supercritical carbon dioxide extraction of St. John's Wort.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Modelling and optimization of supercritical CO2 extraction of St. John's Wort (Hypericum perforatum L.) using genetic algorithm
EP  - 108
SP  - 102
VL  - 62
DO  - 10.1016/j.supflu.2011.12.001
ER  - 

@article{
author = "Hatami, Tahmasb and Glišić, Sandra and Orlović, Aleksandar",
year = "2012",
abstract = "Modelling and optimization of the extraction of St. John's Wort using supercritical fluid is the subject of this study. Applying conservation of mass, two partial differential equations were written for solute concentration in both solvent and solid phase. The equilibrium constant of St. John's Wort extract between solid and solvent phase was determined using genetic algorithm optimization technique. The differential equations were solved using numerical techniques simultaneously and were compared with experimental data. The results showed a good agreement between model results and experimental data. Simulation and optimization according to genetic algorithm have shown that 313 K and 20 MPa were the optimum temperature and pressure for supercritical carbon dioxide extraction of St. John's Wort.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Modelling and optimization of supercritical CO2 extraction of St. John's Wort (Hypericum perforatum L.) using genetic algorithm",
pages = "108-102",
volume = "62",
doi = "10.1016/j.supflu.2011.12.001"
}

Hatami, T., Glišić, S.,& Orlović, A.. (2012). Modelling and optimization of supercritical CO2 extraction of St. John's Wort (Hypericum perforatum L.) using genetic algorithm. in Journal of Supercritical Fluids
Elsevier Science Bv, Amsterdam., 62, 102-108.
https://doi.org/10.1016/j.supflu.2011.12.001

Hatami T, Glišić S, Orlović A. Modelling and optimization of supercritical CO2 extraction of St. John's Wort (Hypericum perforatum L.) using genetic algorithm. in Journal of Supercritical Fluids. 2012;62:102-108.
doi:10.1016/j.supflu.2011.12.001 .

Hatami, Tahmasb, Glišić, Sandra, Orlović, Aleksandar, "Modelling and optimization of supercritical CO2 extraction of St. John's Wort (Hypericum perforatum L.) using genetic algorithm" in Journal of Supercritical Fluids, 62 (2012):102-108,
https://doi.org/10.1016/j.supflu.2011.12.001 . .

TY  - JOUR
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2215
AB  - Biodiesel, a mixture of fatty acid methyl esters, is widely used as renewable bio-based alternative fuel for internal combustion engines. Kinetic model of non-catalytic biodiesel synthesis at elevated temperature and pressure, based on triglycerides conversion, is presented in this study. The model was developed using experimental reaction data of non-catalytic biodiesel synthesis at 150 and 210 degrees C, and under pressures of 1.0 and 4.5 MPa, respectively. The phase transition during transesterification at different conditions (subcritical and supercritical) and limitations of mass transfer between two liquid phases were included in the model. This complex reaction was represented by kinetic model with three consecutive and parallel reversible reactions, while kinetic parameters were calculated using simplified procedure based on triglycerides conversion as the only variable. The developed model was found to fit the experimental data for triglyceride conversion with high accuracy.
PB  - Elsevier, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Modelling of non-catalytic biodiesel synthesis under sub and supercritical conditions: The influence of phase distribution
EP  - 70
SP  - 61
VL  - 65
DO  - 10.1016/j.supflu.2012.02.025
ER  - 

@article{
author = "Glišić, Sandra and Orlović, Aleksandar",
year = "2012",
abstract = "Biodiesel, a mixture of fatty acid methyl esters, is widely used as renewable bio-based alternative fuel for internal combustion engines. Kinetic model of non-catalytic biodiesel synthesis at elevated temperature and pressure, based on triglycerides conversion, is presented in this study. The model was developed using experimental reaction data of non-catalytic biodiesel synthesis at 150 and 210 degrees C, and under pressures of 1.0 and 4.5 MPa, respectively. The phase transition during transesterification at different conditions (subcritical and supercritical) and limitations of mass transfer between two liquid phases were included in the model. This complex reaction was represented by kinetic model with three consecutive and parallel reversible reactions, while kinetic parameters were calculated using simplified procedure based on triglycerides conversion as the only variable. The developed model was found to fit the experimental data for triglyceride conversion with high accuracy.",
publisher = "Elsevier, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Modelling of non-catalytic biodiesel synthesis under sub and supercritical conditions: The influence of phase distribution",
pages = "70-61",
volume = "65",
doi = "10.1016/j.supflu.2012.02.025"
}

Glišić, S.,& Orlović, A.. (2012). Modelling of non-catalytic biodiesel synthesis under sub and supercritical conditions: The influence of phase distribution. in Journal of Supercritical Fluids
Elsevier, Amsterdam., 65, 61-70.
https://doi.org/10.1016/j.supflu.2012.02.025

Glišić S, Orlović A. Modelling of non-catalytic biodiesel synthesis under sub and supercritical conditions: The influence of phase distribution. in Journal of Supercritical Fluids. 2012;65:61-70.
doi:10.1016/j.supflu.2012.02.025 .

Glišić, Sandra, Orlović, Aleksandar, "Modelling of non-catalytic biodiesel synthesis under sub and supercritical conditions: The influence of phase distribution" in Journal of Supercritical Fluids, 65 (2012):61-70,
https://doi.org/10.1016/j.supflu.2012.02.025 . .

TY  - CHAP
AU  - Glišić, Sandra
AU  - Skala, Dejan
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1761
AB  - A large interest in research as well as dramatically increased number of scientific papers covering this topic evidently exists. This chapter covers the literature review of biodiesel production under specific conditions (high pressure and high temperature) indicating the permanent trend in the field of biodiesel technology development. It will focus on the following: 1. The problems in design and detailed analyses of energy consumption Until now there have been several papers with the same topic "design of biodiesel production". The first part of this chapter will focus on "design problems" which have not been well explained or analyzed in recently published papers. They will be summarized indicating the best solution for solving specific design problems (application of EOS, thermodynamic properties under high pressure and temperature, degree of conversion, products purity). 2. The best route for reducing the energy consumption On the basis of a realistic approach and performed analyses of energy consumption necessary for methanolysis of vegetable oil performed under different conditions, the best solution will be recommended in the second part of this chapter. 3. Techno-economical analysis of supercritical synthesis On the basis of techno-economical analysis, we will show that biodiesel production at supercritical condition of methanol represents the competitive technology to the homogeneous alkali catalysed alcoholysis today widely used in many industrial plants. Moreover, we will point out that biodiesel production at supercritical alcoholysis has significant advantages regarding impact to the environment because there is no formation of side products (salts, waste water). Furthermore, application of supercritical alcoholysis gives almost the pure products (biodiesel and glycerol) which can be easily separated in the final stage of synthesis which has the main influence on the techno-economical aspect of biodiesel production.
T2  - Supercritical Fluids
T1  - Biodiesel production: The problems in software design at supercritical and subcritical conditions
EP  - 557
SP  - 525
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1761
ER  - 

@inbook{
author = "Glišić, Sandra and Skala, Dejan",
year = "2011",
abstract = "A large interest in research as well as dramatically increased number of scientific papers covering this topic evidently exists. This chapter covers the literature review of biodiesel production under specific conditions (high pressure and high temperature) indicating the permanent trend in the field of biodiesel technology development. It will focus on the following: 1. The problems in design and detailed analyses of energy consumption Until now there have been several papers with the same topic "design of biodiesel production". The first part of this chapter will focus on "design problems" which have not been well explained or analyzed in recently published papers. They will be summarized indicating the best solution for solving specific design problems (application of EOS, thermodynamic properties under high pressure and temperature, degree of conversion, products purity). 2. The best route for reducing the energy consumption On the basis of a realistic approach and performed analyses of energy consumption necessary for methanolysis of vegetable oil performed under different conditions, the best solution will be recommended in the second part of this chapter. 3. Techno-economical analysis of supercritical synthesis On the basis of techno-economical analysis, we will show that biodiesel production at supercritical condition of methanol represents the competitive technology to the homogeneous alkali catalysed alcoholysis today widely used in many industrial plants. Moreover, we will point out that biodiesel production at supercritical alcoholysis has significant advantages regarding impact to the environment because there is no formation of side products (salts, waste water). Furthermore, application of supercritical alcoholysis gives almost the pure products (biodiesel and glycerol) which can be easily separated in the final stage of synthesis which has the main influence on the techno-economical aspect of biodiesel production.",
journal = "Supercritical Fluids",
booktitle = "Biodiesel production: The problems in software design at supercritical and subcritical conditions",
pages = "557-525",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1761"
}

Glišić, S.,& Skala, D.. (2011). Biodiesel production: The problems in software design at supercritical and subcritical conditions. in Supercritical Fluids, 525-557.
https://hdl.handle.net/21.15107/rcub_technorep_1761

Glišić S, Skala D. Biodiesel production: The problems in software design at supercritical and subcritical conditions. in Supercritical Fluids. 2011;:525-557.
https://hdl.handle.net/21.15107/rcub_technorep_1761 .

Glišić, Sandra, Skala, Dejan, "Biodiesel production: The problems in software design at supercritical and subcritical conditions" in Supercritical Fluids (2011):525-557,
https://hdl.handle.net/21.15107/rcub_technorep_1761 .

TY  - JOUR
AU  - Glišić, Sandra
AU  - Ristić, Mihailo S.
AU  - Skala, Dejan
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1933
AB  - A wide spectrum of phytochemicals could be isolated from sage (Salvia officinalis L) using different extraction or distillation technique: the supercritical fluid extraction (SFE), the volatiles compounds (monoterpenes and sesquiterpenes) isolation using hydrodistillation or higher molecular compounds with Soxhlet extraction or ultrasound-assisted extraction. The combination of ultrasound-assisted extraction followed by re-extraction of obtained extract with supercritical CO2 was performed in this study. The goal of performed investigation was to concentrate diterpenes present in sage extract which are generally considered to be responsible for antioxidant activity of extracted compounds. The fractionation using the supercritical CO2, and different combination of the ultrasound-assisted solvent extractions (water-ethanol mixture or only water) followed by supercritical CO2 re-extraction of obtained extract or treated plant material were analyzed and compared. Based on the results of these investigations it could be proposed the best extraction procedure: the ultrasound pretreatment of plant material with distilled water and re-extraction of plant material (residue) using supercritical CO2. That procedure gives two valuable products: the ultrasound extract which is rich in sugars and possess the immunomodulatory activity and supercritical extract which is rich in diterpenes and sesquiterpenes.
PB  - Elsevier Science Bv, Amsterdam
T2  - Ultrasonics Sonochemistry
T1  - The combined extraction of sage (Salvia officinalis L.): Ultrasound followed by supercritical CO2 extraction
EP  - 326
IS  - 1
SP  - 318
VL  - 18
DO  - 10.1016/j.ultsonch.2010.06.011
ER  - 

@article{
author = "Glišić, Sandra and Ristić, Mihailo S. and Skala, Dejan",
year = "2011",
abstract = "A wide spectrum of phytochemicals could be isolated from sage (Salvia officinalis L) using different extraction or distillation technique: the supercritical fluid extraction (SFE), the volatiles compounds (monoterpenes and sesquiterpenes) isolation using hydrodistillation or higher molecular compounds with Soxhlet extraction or ultrasound-assisted extraction. The combination of ultrasound-assisted extraction followed by re-extraction of obtained extract with supercritical CO2 was performed in this study. The goal of performed investigation was to concentrate diterpenes present in sage extract which are generally considered to be responsible for antioxidant activity of extracted compounds. The fractionation using the supercritical CO2, and different combination of the ultrasound-assisted solvent extractions (water-ethanol mixture or only water) followed by supercritical CO2 re-extraction of obtained extract or treated plant material were analyzed and compared. Based on the results of these investigations it could be proposed the best extraction procedure: the ultrasound pretreatment of plant material with distilled water and re-extraction of plant material (residue) using supercritical CO2. That procedure gives two valuable products: the ultrasound extract which is rich in sugars and possess the immunomodulatory activity and supercritical extract which is rich in diterpenes and sesquiterpenes.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Ultrasonics Sonochemistry",
title = "The combined extraction of sage (Salvia officinalis L.): Ultrasound followed by supercritical CO2 extraction",
pages = "326-318",
number = "1",
volume = "18",
doi = "10.1016/j.ultsonch.2010.06.011"
}

Glišić, S., Ristić, M. S.,& Skala, D.. (2011). The combined extraction of sage (Salvia officinalis L.): Ultrasound followed by supercritical CO2 extraction. in Ultrasonics Sonochemistry
Elsevier Science Bv, Amsterdam., 18(1), 318-326.
https://doi.org/10.1016/j.ultsonch.2010.06.011

Glišić S, Ristić MS, Skala D. The combined extraction of sage (Salvia officinalis L.): Ultrasound followed by supercritical CO2 extraction. in Ultrasonics Sonochemistry. 2011;18(1):318-326.
doi:10.1016/j.ultsonch.2010.06.011 .

Glišić, Sandra, Ristić, Mihailo S., Skala, Dejan, "The combined extraction of sage (Salvia officinalis L.): Ultrasound followed by supercritical CO2 extraction" in Ultrasonics Sonochemistry, 18, no. 1 (2011):318-326,
https://doi.org/10.1016/j.ultsonch.2010.06.011 . .

TY  - JOUR
AU  - Glišić, Sandra
AU  - Skala, Dejan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1592
AB  - The analysis of phase equilibrium between methanol and glycerides during methyl esters of fatty acids (FAME or biodiesel) synthesis at high pressure and temperature is very important for describing the kinetic and process design. It was studied at pressure between 1.1 and 28.0 MPa and temperature from 150 to 270 degrees C. The transition of phases and composition of identified phases was calculated using RK-Aspen EOS and obtained values were also compared to experimentally determined data at subcritical condition (1.1-4.5 MPa and 150-210 degrees C). Results of experimental investigation, as well as performed simulation of some specified composition of reaction mixture, showed that system of triglycerides and methanol, at the beginning of reaction (at all analysed conditions except for supercritical state of mixture) is in equilibrium between two liquid phases. During the methanolysis of triglycerides, the phase's distribution was changed accordingly and it highly depends on actual composition of reaction mixture, temperature and pressure. Calculated and measured values indicated that distribution of methanol between the oil phase, the methyl esters, and the glycerol rich phase exists and depends of working condition. As a consequence of fact, that the methanolysis of triglycerides (oil) is mainly realized in the oil-rich phase, at the end of reaction, after all triglycerides are converted into FAME and glycerol, the oil phase disappears. Furthermore, according to the results of phase composition calculation, it was shown that from the beginning to the end of reaction one phase only exists, for methanolysis performed at 270 degrees C and 20.0 MPa.
PB  - Elsevier, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Phase transition at subcritical and supercritical conditions of triglycerides methanolysis
EP  - 80
IS  - 1
SP  - 71
VL  - 54
DO  - 10.1016/j.supflu.2010.03.005
ER  - 

@article{
author = "Glišić, Sandra and Skala, Dejan",
year = "2010",
abstract = "The analysis of phase equilibrium between methanol and glycerides during methyl esters of fatty acids (FAME or biodiesel) synthesis at high pressure and temperature is very important for describing the kinetic and process design. It was studied at pressure between 1.1 and 28.0 MPa and temperature from 150 to 270 degrees C. The transition of phases and composition of identified phases was calculated using RK-Aspen EOS and obtained values were also compared to experimentally determined data at subcritical condition (1.1-4.5 MPa and 150-210 degrees C). Results of experimental investigation, as well as performed simulation of some specified composition of reaction mixture, showed that system of triglycerides and methanol, at the beginning of reaction (at all analysed conditions except for supercritical state of mixture) is in equilibrium between two liquid phases. During the methanolysis of triglycerides, the phase's distribution was changed accordingly and it highly depends on actual composition of reaction mixture, temperature and pressure. Calculated and measured values indicated that distribution of methanol between the oil phase, the methyl esters, and the glycerol rich phase exists and depends of working condition. As a consequence of fact, that the methanolysis of triglycerides (oil) is mainly realized in the oil-rich phase, at the end of reaction, after all triglycerides are converted into FAME and glycerol, the oil phase disappears. Furthermore, according to the results of phase composition calculation, it was shown that from the beginning to the end of reaction one phase only exists, for methanolysis performed at 270 degrees C and 20.0 MPa.",
publisher = "Elsevier, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Phase transition at subcritical and supercritical conditions of triglycerides methanolysis",
pages = "80-71",
number = "1",
volume = "54",
doi = "10.1016/j.supflu.2010.03.005"
}

Glišić, S.,& Skala, D.. (2010). Phase transition at subcritical and supercritical conditions of triglycerides methanolysis. in Journal of Supercritical Fluids
Elsevier, Amsterdam., 54(1), 71-80.
https://doi.org/10.1016/j.supflu.2010.03.005

Glišić S, Skala D. Phase transition at subcritical and supercritical conditions of triglycerides methanolysis. in Journal of Supercritical Fluids. 2010;54(1):71-80.
doi:10.1016/j.supflu.2010.03.005 .

Glišić, Sandra, Skala, Dejan, "Phase transition at subcritical and supercritical conditions of triglycerides methanolysis" in Journal of Supercritical Fluids, 54, no. 1 (2010):71-80,
https://doi.org/10.1016/j.supflu.2010.03.005 . .

TY  - CONF
AU  - Dukanović, Z.
AU  - Duričković, I.
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1552
AB  - Hydrotreating of middle distillates is one of the key processes in modern refining technology. Results of hydrotreating of gas oil and LCO blends, obtained in an industrial hydrotreater, are presented. Increasing temperature differences in the reactor with increasing content of LCO in the blend were observed along with substantial decrease of total sulfur in the product. A mathematical model of the industrial hydrotreater was developed to simulate the reactor behavior under different operating conditions. Cubic EOS were applied to model VLE of the reacting fluid for the ternary mixture composed of hydrogen, methane, and n-hexadecane. Validation of the model was performed using the available data obtained during the industrial test run. This is an abstract of a paper presented at the 7th European Congress of Chemical Engineering-7 and the 19th International Congress of Chemical and Process Engineering CHISA (Prague, Czech Republic 8/28/2010-9/1/2010).
PB  - 19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7
C3  - 19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congres
T1  - Modelling of industrial trickle-bed reactor for hydrotreating of gas oil and light cycle oil blends
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1552
ER  - 

@conference{
author = "Dukanović, Z. and Duričković, I. and Glišić, Sandra and Orlović, Aleksandar",
year = "2010",
abstract = "Hydrotreating of middle distillates is one of the key processes in modern refining technology. Results of hydrotreating of gas oil and LCO blends, obtained in an industrial hydrotreater, are presented. Increasing temperature differences in the reactor with increasing content of LCO in the blend were observed along with substantial decrease of total sulfur in the product. A mathematical model of the industrial hydrotreater was developed to simulate the reactor behavior under different operating conditions. Cubic EOS were applied to model VLE of the reacting fluid for the ternary mixture composed of hydrogen, methane, and n-hexadecane. Validation of the model was performed using the available data obtained during the industrial test run. This is an abstract of a paper presented at the 7th European Congress of Chemical Engineering-7 and the 19th International Congress of Chemical and Process Engineering CHISA (Prague, Czech Republic 8/28/2010-9/1/2010).",
publisher = "19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7",
journal = "19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congres",
title = "Modelling of industrial trickle-bed reactor for hydrotreating of gas oil and light cycle oil blends",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1552"
}

Dukanović, Z., Duričković, I., Glišić, S.,& Orlović, A.. (2010). Modelling of industrial trickle-bed reactor for hydrotreating of gas oil and light cycle oil blends. in 19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congres
19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7..
https://hdl.handle.net/21.15107/rcub_technorep_1552

Dukanović Z, Duričković I, Glišić S, Orlović A. Modelling of industrial trickle-bed reactor for hydrotreating of gas oil and light cycle oil blends. in 19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congres. 2010;.
https://hdl.handle.net/21.15107/rcub_technorep_1552 .

Dukanović, Z., Duričković, I., Glišić, Sandra, Orlović, Aleksandar, "Modelling of industrial trickle-bed reactor for hydrotreating of gas oil and light cycle oil blends" in 19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congres (2010),
https://hdl.handle.net/21.15107/rcub_technorep_1552 .

TY  - JOUR
AU  - Stojanović, Dušica
AU  - Orlović, Aleksandar
AU  - Glišić, Sandra
AU  - Marković, Smilja
AU  - Radmilović, Velimir R.
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1701
AB  - The objective of this study is to investigate and compare methods of nanosilica coating with gamma-methacryloxypropyltrimethoxy (MEMO) silane using supercritical carbon dioxide and carbon dioxide-ethanol mixture. Characterization of grafted silane coupling agent on the nanosilica surface was performed by the infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The d(50) value and particle size distribution were determined by laser particle size analyzer (PSA). The operating parameters of silanization process at 40 degrees C, such as the silica/silane weight ratio, the presence of ethanol, and the pressure, were found to be important for the successful coating of silica particles with minimum agglomeration. The results indicate that presence of ethanol in high-pressure carbon dioxide plays an important role in achieving successful deagglomeration of coated nanoparticles. Dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM) revealed that dispersion of the silica particles in the PMMA matrix and interfacial adhesion between silica particles and polymer matrix were enhanced, when silica nanoparticles treated with silane under high pressure of carbon dioxide and ethanol were used for the nanocomposite preparation.
PB  - Elsevier, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol
EP  - 284
IS  - 3
SP  - 276
VL  - 52
DO  - 10.1016/j.supflu.2010.02.004
ER  - 

@article{
author = "Stojanović, Dušica and Orlović, Aleksandar and Glišić, Sandra and Marković, Smilja and Radmilović, Velimir R. and Uskoković, Petar and Aleksić, Radoslav",
year = "2010",
abstract = "The objective of this study is to investigate and compare methods of nanosilica coating with gamma-methacryloxypropyltrimethoxy (MEMO) silane using supercritical carbon dioxide and carbon dioxide-ethanol mixture. Characterization of grafted silane coupling agent on the nanosilica surface was performed by the infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The d(50) value and particle size distribution were determined by laser particle size analyzer (PSA). The operating parameters of silanization process at 40 degrees C, such as the silica/silane weight ratio, the presence of ethanol, and the pressure, were found to be important for the successful coating of silica particles with minimum agglomeration. The results indicate that presence of ethanol in high-pressure carbon dioxide plays an important role in achieving successful deagglomeration of coated nanoparticles. Dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM) revealed that dispersion of the silica particles in the PMMA matrix and interfacial adhesion between silica particles and polymer matrix were enhanced, when silica nanoparticles treated with silane under high pressure of carbon dioxide and ethanol were used for the nanocomposite preparation.",
publisher = "Elsevier, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol",
pages = "284-276",
number = "3",
volume = "52",
doi = "10.1016/j.supflu.2010.02.004"
}

Stojanović, D., Orlović, A., Glišić, S., Marković, S., Radmilović, V. R., Uskoković, P.,& Aleksić, R.. (2010). Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol. in Journal of Supercritical Fluids
Elsevier, Amsterdam., 52(3), 276-284.
https://doi.org/10.1016/j.supflu.2010.02.004

Stojanović D, Orlović A, Glišić S, Marković S, Radmilović VR, Uskoković P, Aleksić R. Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol. in Journal of Supercritical Fluids. 2010;52(3):276-284.
doi:10.1016/j.supflu.2010.02.004 .

Stojanović, Dušica, Orlović, Aleksandar, Glišić, Sandra, Marković, Smilja, Radmilović, Velimir R., Uskoković, Petar, Aleksić, Radoslav, "Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure of carbon dioxide and ethanol" in Journal of Supercritical Fluids, 52, no. 3 (2010):276-284,
https://doi.org/10.1016/j.supflu.2010.02.004 . .

TY  - JOUR
AU  - Glišić, Sandra
AU  - Ivanović, Jasna
AU  - Ristić, Mihailo S.
AU  - Skala, Dejan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1676
AB  - The supercritical carbon dioxide (SFE) extraction of Dalmatian sage (Salvia officinalis L) was investigated and compared to extraction performed by Soxhlet ethanol-water (70:30) mixture extraction (SE) and hydrodistillation (HD). The supercritical extraction allowed isolation of wide spectrum of phytochemicals, while other applied methods were limited to either volatiles (HD) or high molecular compounds isolation (SE). The kinetics of the supercritical extraction and fractionation within the pressure range of 10-30 MPa at 50 degrees C were also analyzed as well as the chemical compositions of total extract and partial or differential fractions isolated at different CO2. consumption. Volatile fraction could be isolated at low pressure and low CO2 consumption, whereby the pressures between 10 and 15 MPa followed by increased CO2 consumption were favourable for obtaining desired selectivity of diterpenes which contain compounds with expressed antioxidative characteristics.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Extraction of sage (Salvia officinalis L.) by supercritical CO2: Kinetic data, chemical composition and selectivity of diterpenes
EP  - 70
IS  - 1
SP  - 62
VL  - 52
DO  - 10.1016/j.supflu.2009.11.009
ER  - 

@article{
author = "Glišić, Sandra and Ivanović, Jasna and Ristić, Mihailo S. and Skala, Dejan",
year = "2010",
abstract = "The supercritical carbon dioxide (SFE) extraction of Dalmatian sage (Salvia officinalis L) was investigated and compared to extraction performed by Soxhlet ethanol-water (70:30) mixture extraction (SE) and hydrodistillation (HD). The supercritical extraction allowed isolation of wide spectrum of phytochemicals, while other applied methods were limited to either volatiles (HD) or high molecular compounds isolation (SE). The kinetics of the supercritical extraction and fractionation within the pressure range of 10-30 MPa at 50 degrees C were also analyzed as well as the chemical compositions of total extract and partial or differential fractions isolated at different CO2. consumption. Volatile fraction could be isolated at low pressure and low CO2 consumption, whereby the pressures between 10 and 15 MPa followed by increased CO2 consumption were favourable for obtaining desired selectivity of diterpenes which contain compounds with expressed antioxidative characteristics.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Extraction of sage (Salvia officinalis L.) by supercritical CO2: Kinetic data, chemical composition and selectivity of diterpenes",
pages = "70-62",
number = "1",
volume = "52",
doi = "10.1016/j.supflu.2009.11.009"
}

Glišić, S., Ivanović, J., Ristić, M. S.,& Skala, D.. (2010). Extraction of sage (Salvia officinalis L.) by supercritical CO2: Kinetic data, chemical composition and selectivity of diterpenes. in Journal of Supercritical Fluids
Elsevier Science Bv, Amsterdam., 52(1), 62-70.
https://doi.org/10.1016/j.supflu.2009.11.009

Glišić S, Ivanović J, Ristić MS, Skala D. Extraction of sage (Salvia officinalis L.) by supercritical CO2: Kinetic data, chemical composition and selectivity of diterpenes. in Journal of Supercritical Fluids. 2010;52(1):62-70.
doi:10.1016/j.supflu.2009.11.009 .

Glišić, Sandra, Ivanović, Jasna, Ristić, Mihailo S., Skala, Dejan, "Extraction of sage (Salvia officinalis L.) by supercritical CO2: Kinetic data, chemical composition and selectivity of diterpenes" in Journal of Supercritical Fluids, 52, no. 1 (2010):62-70,
https://doi.org/10.1016/j.supflu.2009.11.009 . .

TY  - JOUR
AU  - Lukić, Ivana
AU  - Krstić, Jugoslav
AU  - Glišić, Sandra
AU  - Jovanović, Dušan
AU  - Skala, Dejan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1600
AB  - In this study, catalysts for fatty acid methyl esters (FAME or biodiesel) synthesis with K2CO3 as the active component on an alumina/silica support were synthesized using the sol-gel method, which was followed by drying the 'dense' wet gels with supercritical carbon dioxide to obtain the aerogels. The prepared catalysts were characterized by XRD analysis, FTIR spectroscopy and N2 physisorption at 77 K, and tested in the methanolysis of sunflower oil. The effects of reaction variables, such as reaction time, temperature and methanol to oil molar ratio, on the yield of FAME were investigated. The aerogel catalysts with K2CO3 as the active component on an alumina/silica support exhibited good activity in the methanolysis of sunflower oil. The leaching of potassium when the catalyst was in contact with pure methanol under the working conditions of methanolysis was also tested in this study, indicating that it occurred only at higher temperatures, while at lower ones, it was negligible.
AB  - U ovom radu katalizator za sintezu metil estara masnih kiselina (MEMK ili biodizel) sa K2CO3 kao aktivnom komponentom na alumosilikatnom nosaču sintetizovan je sol-gel metodom nakon čega je dobijeni gel sušen uz prisustvo natkritičnog ugljen dioksida da bi se dobio aerogel. Za karakterizaciju sintetizovanih katalizatora korišćene su metode XRD, FTIR i N2 fizisorpcija na 77 K i katalizatori su testirani u reakciji metanolize suncokretovog ulja. Katalizator je testiran u reakciji metanolize suncekrotovog ulja i sintezi MEMK. Ispitan je uticaj različitih parametara kao što su vreme, temperatura i molarni odnos metanol : ulje na prinos MEMK. Aerogel katalizator sa K2CO3 kao aktivnom komponentom na alumosilikatnom nosaču pokazao je dobru katalitičku aktivnost u reakciji metanolize suncokretovog ulja. Izluživanje kalijuma u kontaktu sa metanolom na radnim uslovima metanolize takođe je testirano u ovom radu, pokazujući da ono postoji na višim temperaturama, dok je na nižim zanemarljivo.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Biodiesel synthesis using K2CO3/Al-O-Si aerogel catalysts
T1  - Sinteza biodizela katalizovana alumosilikatnim aerogelom sa K2Co3
EP  - 801
IS  - 6
SP  - 789
VL  - 75
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1600
ER  - 

@article{
author = "Lukić, Ivana and Krstić, Jugoslav and Glišić, Sandra and Jovanović, Dušan and Skala, Dejan",
year = "2010",
abstract = "In this study, catalysts for fatty acid methyl esters (FAME or biodiesel) synthesis with K2CO3 as the active component on an alumina/silica support were synthesized using the sol-gel method, which was followed by drying the 'dense' wet gels with supercritical carbon dioxide to obtain the aerogels. The prepared catalysts were characterized by XRD analysis, FTIR spectroscopy and N2 physisorption at 77 K, and tested in the methanolysis of sunflower oil. The effects of reaction variables, such as reaction time, temperature and methanol to oil molar ratio, on the yield of FAME were investigated. The aerogel catalysts with K2CO3 as the active component on an alumina/silica support exhibited good activity in the methanolysis of sunflower oil. The leaching of potassium when the catalyst was in contact with pure methanol under the working conditions of methanolysis was also tested in this study, indicating that it occurred only at higher temperatures, while at lower ones, it was negligible., U ovom radu katalizator za sintezu metil estara masnih kiselina (MEMK ili biodizel) sa K2CO3 kao aktivnom komponentom na alumosilikatnom nosaču sintetizovan je sol-gel metodom nakon čega je dobijeni gel sušen uz prisustvo natkritičnog ugljen dioksida da bi se dobio aerogel. Za karakterizaciju sintetizovanih katalizatora korišćene su metode XRD, FTIR i N2 fizisorpcija na 77 K i katalizatori su testirani u reakciji metanolize suncokretovog ulja. Katalizator je testiran u reakciji metanolize suncekrotovog ulja i sintezi MEMK. Ispitan je uticaj različitih parametara kao što su vreme, temperatura i molarni odnos metanol : ulje na prinos MEMK. Aerogel katalizator sa K2CO3 kao aktivnom komponentom na alumosilikatnom nosaču pokazao je dobru katalitičku aktivnost u reakciji metanolize suncokretovog ulja. Izluživanje kalijuma u kontaktu sa metanolom na radnim uslovima metanolize takođe je testirano u ovom radu, pokazujući da ono postoji na višim temperaturama, dok je na nižim zanemarljivo.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Biodiesel synthesis using K2CO3/Al-O-Si aerogel catalysts, Sinteza biodizela katalizovana alumosilikatnim aerogelom sa K2Co3",
pages = "801-789",
number = "6",
volume = "75",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1600"
}

Lukić, I., Krstić, J., Glišić, S., Jovanović, D.,& Skala, D.. (2010). Biodiesel synthesis using K2CO3/Al-O-Si aerogel catalysts. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 75(6), 789-801.
https://hdl.handle.net/21.15107/rcub_technorep_1600

Lukić I, Krstić J, Glišić S, Jovanović D, Skala D. Biodiesel synthesis using K2CO3/Al-O-Si aerogel catalysts. in Journal of the Serbian Chemical Society. 2010;75(6):789-801.
https://hdl.handle.net/21.15107/rcub_technorep_1600 .

Lukić, Ivana, Krstić, Jugoslav, Glišić, Sandra, Jovanović, Dušan, Skala, Dejan, "Biodiesel synthesis using K2CO3/Al-O-Si aerogel catalysts" in Journal of the Serbian Chemical Society, 75, no. 6 (2010):789-801,
https://hdl.handle.net/21.15107/rcub_technorep_1600 .

TY  - JOUR
AU  - Milojević, Svetomir
AU  - Glišić, Sandra
AU  - Skala, Dejan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1663
AB  - The separation in a batch vacuum column of the essential oil of common juniper berries (Juniperus communis L., from the southern part of Serbia) was analyzed. The main goal of the analyzed separation process was to isolate several fractions from the essential oil which mainly contained á-pinene, sabinene and myrcene. These compounds contain about 65 mass% of the essential oil produced by hydrodistillation from the juniper berries originated from the southern part of Serbia. The results of experimental work in a laboratory column with 36 theoretical stages under vacuum (8.0-3.35 kPa) was simulated using Aspen software, and a proposed mathematical model was used to analyze some other operating conditions for fractionation of juniper berry's oil (number of plates: 25, 36 and 45 and reflux ratio: 2-10). According to the results of performed simulations, the most acceptable separation procedure which takes into account the prices of raw materials and distillate (á-pinene) as well as consumed energy was proposed.
AB  - U ovom radu je ispitivana separacija etarskog ulja iz bobica kleke (Juniperus communis L. sa podneblja južne Srbije) postupkom šaržne vakuum destilacije. Glavni cilj laboratorijskih ispitivanja je usmeren ka izdvajanju pojedinih frakcija iz etarskog ulja kleke koje sadrže u većem procentu á-pinen, sabinen i mircen, a čine 65 mas% etarskog ulja dobijenog hidrodestilacijom bobica kleke. Rezultati eksperimentalnih ispitivanja sprovedenih šaržnom destilacijom pod vakuumom (8,0-3,35 kPa) u koloni sa 36 teorijskih podova su bili osnova za definisanje odgovarajućeg matematičkog modela i njegovog rešavanja primenom softverskog paketa Aspen. Dobijeno je dobro slaganje između eksperimentalnih vrednosti i vrednosti izračunatih na osnovu ovog modela. Potvrđena korektnost modela iskorišćena je za analizu uticaja različitih operativnih parametara (refluksni odnos od 2 do 10) i konstrukcionih karakteristika kolone (broj podova: 25, 36 i 45) na efekte separacije etarskog ulja kleke. Rezultati su pokazali, na osnovu analize uticaja cene ulazne sirovine, cene izdvojenih frakcija (á-pinen; smeše á-pinena sabinena, mircena) i ukupno utrošene energije za separaciju, da je u laboratorijskim uslovima izvedeno frakcionisanje etarskog ulja kleke najprihvatljivije.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - The batch fractionation of Juniperus communis L. essential oil: Experimental study, mathematical simulation and process economy
T1  - Frakciona destilacija etarskog ulja Juniperus communis L. - laboratorijska ispitivanja, matematička simulacija i ekonomika procesa
EP  - 191
IS  - 2
SP  - 183
VL  - 16
DO  - 10.2298/CICEQ100317026M
ER  - 

@article{
author = "Milojević, Svetomir and Glišić, Sandra and Skala, Dejan",
year = "2010",
abstract = "The separation in a batch vacuum column of the essential oil of common juniper berries (Juniperus communis L., from the southern part of Serbia) was analyzed. The main goal of the analyzed separation process was to isolate several fractions from the essential oil which mainly contained á-pinene, sabinene and myrcene. These compounds contain about 65 mass% of the essential oil produced by hydrodistillation from the juniper berries originated from the southern part of Serbia. The results of experimental work in a laboratory column with 36 theoretical stages under vacuum (8.0-3.35 kPa) was simulated using Aspen software, and a proposed mathematical model was used to analyze some other operating conditions for fractionation of juniper berry's oil (number of plates: 25, 36 and 45 and reflux ratio: 2-10). According to the results of performed simulations, the most acceptable separation procedure which takes into account the prices of raw materials and distillate (á-pinene) as well as consumed energy was proposed., U ovom radu je ispitivana separacija etarskog ulja iz bobica kleke (Juniperus communis L. sa podneblja južne Srbije) postupkom šaržne vakuum destilacije. Glavni cilj laboratorijskih ispitivanja je usmeren ka izdvajanju pojedinih frakcija iz etarskog ulja kleke koje sadrže u većem procentu á-pinen, sabinen i mircen, a čine 65 mas% etarskog ulja dobijenog hidrodestilacijom bobica kleke. Rezultati eksperimentalnih ispitivanja sprovedenih šaržnom destilacijom pod vakuumom (8,0-3,35 kPa) u koloni sa 36 teorijskih podova su bili osnova za definisanje odgovarajućeg matematičkog modela i njegovog rešavanja primenom softverskog paketa Aspen. Dobijeno je dobro slaganje između eksperimentalnih vrednosti i vrednosti izračunatih na osnovu ovog modela. Potvrđena korektnost modela iskorišćena je za analizu uticaja različitih operativnih parametara (refluksni odnos od 2 do 10) i konstrukcionih karakteristika kolone (broj podova: 25, 36 i 45) na efekte separacije etarskog ulja kleke. Rezultati su pokazali, na osnovu analize uticaja cene ulazne sirovine, cene izdvojenih frakcija (á-pinen; smeše á-pinena sabinena, mircena) i ukupno utrošene energije za separaciju, da je u laboratorijskim uslovima izvedeno frakcionisanje etarskog ulja kleke najprihvatljivije.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "The batch fractionation of Juniperus communis L. essential oil: Experimental study, mathematical simulation and process economy, Frakciona destilacija etarskog ulja Juniperus communis L. - laboratorijska ispitivanja, matematička simulacija i ekonomika procesa",
pages = "191-183",
number = "2",
volume = "16",
doi = "10.2298/CICEQ100317026M"
}

Milojević, S., Glišić, S.,& Skala, D.. (2010). The batch fractionation of Juniperus communis L. essential oil: Experimental study, mathematical simulation and process economy. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 16(2), 183-191.
https://doi.org/10.2298/CICEQ100317026M

Milojević S, Glišić S, Skala D. The batch fractionation of Juniperus communis L. essential oil: Experimental study, mathematical simulation and process economy. in Chemical Industry & Chemical Engineering Quarterly. 2010;16(2):183-191.
doi:10.2298/CICEQ100317026M .

Milojević, Svetomir, Glišić, Sandra, Skala, Dejan, "The batch fractionation of Juniperus communis L. essential oil: Experimental study, mathematical simulation and process economy" in Chemical Industry & Chemical Engineering Quarterly, 16, no. 2 (2010):183-191,
https://doi.org/10.2298/CICEQ100317026M . .