TY  - JOUR
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Kostić, Milan
AU  - Lončarević, Davor
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
AU  - Veljković, Vlada B.
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4586
AB  - Lignite coal fly ash (FA) from a domestic thermal power plant was converted into a pure cancrinite zeolitic material (ZMFA) using a novel, custom-made, rotating autoclave reactor system by a short-term alkali activation process. The obtained ZMFA was used as catalyst support of calcium oxide as an active component derived from waste chicken eggshells (ES). The ZMFA supported calcium oxide catalyst (xCaO/ZMFA) was synthesized by means of the ultrasound-assisted method. The influence of different concentrations of dispersed calcium oxide (x = 5–20 wt%) over ZMFA and thermal treatment at different temperatures (450–600 °C) were studied. The structural and morphological characterization showed that the original cancrinite structure was preserved. The basicity and textural properties indicated the presence of strong active sites in a well-defined pore network suitable for the reactions of bulky organic compounds such as triacylglycerols (TAGs). The highest activity (96.5% of fatty acid methyl esters) in the methanolysis of sunflower oil was achieved with the 20CaO/ZMFA catalyst under reaction conditions: temperature of 60 °C, methanol/oil molar ratio of 12:1, catalyst concentration of 4 wt%, and reaction time of 2 h. It was found that the optimal calcination temperature of the catalyst precursor was 550 °C. At calcination temperatures above 550 °C, the melting of the glassy phase became more intense whereby the molten phase partially reacted with calcium oxide forming the catalytically inactive calcium silicate compounds (wollastonite, larnite, etc.). The rate constants of the two tested kinetic models were correlated with the concentrations of active calcium oxide. The MRPD of both models was low indicating their reliability.
PB  - Elsevier
T2  - Fuel
T1  - The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production
SP  - 119912
VL  - 289
DO  - 10.1016/j.fuel.2020.119912
ER  - 

@article{
author = "Pavlović, Stefan and Marinković, Dalibor and Kostić, Milan and Lončarević, Davor and Mojović, Ljiljana and Stanković, Miroslav and Veljković, Vlada B.",
year = "2021",
abstract = "Lignite coal fly ash (FA) from a domestic thermal power plant was converted into a pure cancrinite zeolitic material (ZMFA) using a novel, custom-made, rotating autoclave reactor system by a short-term alkali activation process. The obtained ZMFA was used as catalyst support of calcium oxide as an active component derived from waste chicken eggshells (ES). The ZMFA supported calcium oxide catalyst (xCaO/ZMFA) was synthesized by means of the ultrasound-assisted method. The influence of different concentrations of dispersed calcium oxide (x = 5–20 wt%) over ZMFA and thermal treatment at different temperatures (450–600 °C) were studied. The structural and morphological characterization showed that the original cancrinite structure was preserved. The basicity and textural properties indicated the presence of strong active sites in a well-defined pore network suitable for the reactions of bulky organic compounds such as triacylglycerols (TAGs). The highest activity (96.5% of fatty acid methyl esters) in the methanolysis of sunflower oil was achieved with the 20CaO/ZMFA catalyst under reaction conditions: temperature of 60 °C, methanol/oil molar ratio of 12:1, catalyst concentration of 4 wt%, and reaction time of 2 h. It was found that the optimal calcination temperature of the catalyst precursor was 550 °C. At calcination temperatures above 550 °C, the melting of the glassy phase became more intense whereby the molten phase partially reacted with calcium oxide forming the catalytically inactive calcium silicate compounds (wollastonite, larnite, etc.). The rate constants of the two tested kinetic models were correlated with the concentrations of active calcium oxide. The MRPD of both models was low indicating their reliability.",
publisher = "Elsevier",
journal = "Fuel",
title = "The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production",
pages = "119912",
volume = "289",
doi = "10.1016/j.fuel.2020.119912"
}

Pavlović, S., Marinković, D., Kostić, M., Lončarević, D., Mojović, L., Stanković, M.,& Veljković, V. B.. (2021). The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production. in Fuel
Elsevier., 289, 119912.
https://doi.org/10.1016/j.fuel.2020.119912

Pavlović S, Marinković D, Kostić M, Lončarević D, Mojović L, Stanković M, Veljković VB. The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production. in Fuel. 2021;289:119912.
doi:10.1016/j.fuel.2020.119912 .

Pavlović, Stefan, Marinković, Dalibor, Kostić, Milan, Lončarević, Davor, Mojović, Ljiljana, Stanković, Miroslav, Veljković, Vlada B., "The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production" in Fuel, 289 (2021):119912,
https://doi.org/10.1016/j.fuel.2020.119912 . .

TY  - JOUR
AU  - Đorđević, Biljana S.
AU  - Troter, Dragan Z.
AU  - Veljković, Vlada B.
AU  - Kijevčanin, Mirjana
AU  - Radović, Ivona
AU  - Todorović, Zoran B.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4427
AB  - Different deep eutectic solvents (DESs) of triethanolamine (TEOA) and oxalic acid (OA), glacial acetic acid (AA), L-(+)-lactic acid (LA), oleic acid (OLA), glycerol (G), ethylene glycol (EG), propylene glycol (PEG), choline chloride (ChCl) or 1,3-dimethylurea (DMU) were prepared and characterized regarding their physicochemical (density, viscosity, electrical conductivity, refractive index, coefficient of volume expansion, molecular volume, lattice energy and heat capacity) properties over the temperature range of 293.15-363.15 K at 101.325 kPa. For all tested DESs, the density, viscosity and refractive index decreased with rising temperature, while the electrical conductivity increased. The temperature dependence of viscosity and electrical conductivity are described by the Vogel-Tamman-Fulcher equations. The viscosity and molar conductivity, which exhibited a linear behaviour, were correlated by the fractional Walden rule. Besides, the Fourier transform infrared spectroscopy (FTIR) was used to study the functional groups of these DESs while thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) provided the information about their stability. The tested DESs of TEOA possess desirable properties for use in various industrial processes, such as extractions, separations, chemical technology and biotechnology.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component
EP  - 1315
IS  - 10
SP  - 1303
VL  - 85
DO  - 10.2298/JSC200425050D
ER  - 

@article{
author = "Đorđević, Biljana S. and Troter, Dragan Z. and Veljković, Vlada B. and Kijevčanin, Mirjana and Radović, Ivona and Todorović, Zoran B.",
year = "2020",
abstract = "Different deep eutectic solvents (DESs) of triethanolamine (TEOA) and oxalic acid (OA), glacial acetic acid (AA), L-(+)-lactic acid (LA), oleic acid (OLA), glycerol (G), ethylene glycol (EG), propylene glycol (PEG), choline chloride (ChCl) or 1,3-dimethylurea (DMU) were prepared and characterized regarding their physicochemical (density, viscosity, electrical conductivity, refractive index, coefficient of volume expansion, molecular volume, lattice energy and heat capacity) properties over the temperature range of 293.15-363.15 K at 101.325 kPa. For all tested DESs, the density, viscosity and refractive index decreased with rising temperature, while the electrical conductivity increased. The temperature dependence of viscosity and electrical conductivity are described by the Vogel-Tamman-Fulcher equations. The viscosity and molar conductivity, which exhibited a linear behaviour, were correlated by the fractional Walden rule. Besides, the Fourier transform infrared spectroscopy (FTIR) was used to study the functional groups of these DESs while thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) provided the information about their stability. The tested DESs of TEOA possess desirable properties for use in various industrial processes, such as extractions, separations, chemical technology and biotechnology.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component",
pages = "1315-1303",
number = "10",
volume = "85",
doi = "10.2298/JSC200425050D"
}

Đorđević, B. S., Troter, D. Z., Veljković, V. B., Kijevčanin, M., Radović, I.,& Todorović, Z. B.. (2020). The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 85(10), 1303-1315.
https://doi.org/10.2298/JSC200425050D

Đorđević BS, Troter DZ, Veljković VB, Kijevčanin M, Radović I, Todorović ZB. The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component. in Journal of the Serbian Chemical Society. 2020;85(10):1303-1315.
doi:10.2298/JSC200425050D .

Đorđević, Biljana S., Troter, Dragan Z., Veljković, Vlada B., Kijevčanin, Mirjana, Radović, Ivona, Todorović, Zoran B., "The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component" in Journal of the Serbian Chemical Society, 85, no. 10 (2020):1303-1315,
https://doi.org/10.2298/JSC200425050D . .

TY  - JOUR
AU  - Pavlović, Stefan M.
AU  - Marinković, Dalibor
AU  - Kostić, Milan D.
AU  - Janković-Častvan, Ivona
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
AU  - Veljković, Vlada B.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4481
AB  - The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gis-mondine and the crystallographic modification of calcium silicate (alpha'-dicalcium silicate) with deposited CaO. The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry, N-2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity (97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the methanolysis reaction under the optimal reaction conditions (temperature of 60 degrees C, methanol/oil molar ratio of 6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory agreement between the experimental and predicted values of conversion degree (R-2  gt  0.93), confirming their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation energy calculated for both mechanisms were 67.17 and 58.03 kJ mol(-1), respectively.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production
VL  - 267
DO  - 10.1016/j.fuel.2020.117171
ER  - 

@article{
author = "Pavlović, Stefan M. and Marinković, Dalibor and Kostić, Milan D. and Janković-Častvan, Ivona and Mojović, Ljiljana and Stanković, Miroslav and Veljković, Vlada B.",
year = "2020",
abstract = "The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gis-mondine and the crystallographic modification of calcium silicate (alpha'-dicalcium silicate) with deposited CaO. The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry, N-2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity (97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the methanolysis reaction under the optimal reaction conditions (temperature of 60 degrees C, methanol/oil molar ratio of 6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory agreement between the experimental and predicted values of conversion degree (R-2  gt  0.93), confirming their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation energy calculated for both mechanisms were 67.17 and 58.03 kJ mol(-1), respectively.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production",
volume = "267",
doi = "10.1016/j.fuel.2020.117171"
}

Pavlović, S. M., Marinković, D., Kostić, M. D., Janković-Častvan, I., Mojović, L., Stanković, M.,& Veljković, V. B.. (2020). A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel
Elsevier Sci Ltd, Oxford., 267.
https://doi.org/10.1016/j.fuel.2020.117171

Pavlović SM, Marinković D, Kostić MD, Janković-Častvan I, Mojović L, Stanković M, Veljković VB. A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel. 2020;267.
doi:10.1016/j.fuel.2020.117171 .

Pavlović, Stefan M., Marinković, Dalibor, Kostić, Milan D., Janković-Častvan, Ivona, Mojović, Ljiljana, Stanković, Miroslav, Veljković, Vlada B., "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production" in Fuel, 267 (2020),
https://doi.org/10.1016/j.fuel.2020.117171 . .

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Zdujić, Miodrag
AU  - Veljović, Đorđe
AU  - Krstić, Jugoslav
AU  - Banković-Ilić, Ivana B.
AU  - Veljković, Vlada B.
AU  - Stamenković, Olivera S.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4350
AB  - The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, Ny physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanolto-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 degrees C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 degrees C.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Renewable Energy
T1  - Valorization of walnut shell ash as a catalyst for biodiesel production
EP  - 1043
SP  - 1033
VL  - 147
DO  - 10.1016/j.renene.2019.09.056
ER  - 

@article{
author = "Miladinović, Marija R. and Zdujić, Miodrag and Veljović, Đorđe and Krstić, Jugoslav and Banković-Ilić, Ivana B. and Veljković, Vlada B. and Stamenković, Olivera S.",
year = "2020",
abstract = "The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, Ny physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanolto-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 degrees C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 degrees C.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Renewable Energy",
title = "Valorization of walnut shell ash as a catalyst for biodiesel production",
pages = "1043-1033",
volume = "147",
doi = "10.1016/j.renene.2019.09.056"
}

Miladinović, M. R., Zdujić, M., Veljović, Đ., Krstić, J., Banković-Ilić, I. B., Veljković, V. B.,& Stamenković, O. S.. (2020). Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy
Pergamon-Elsevier Science Ltd, Oxford., 147, 1033-1043.
https://doi.org/10.1016/j.renene.2019.09.056

Miladinović MR, Zdujić M, Veljović Đ, Krstić J, Banković-Ilić IB, Veljković VB, Stamenković OS. Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy. 2020;147:1033-1043.
doi:10.1016/j.renene.2019.09.056 .

Miladinović, Marija R., Zdujić, Miodrag, Veljović, Đorđe, Krstić, Jugoslav, Banković-Ilić, Ivana B., Veljković, Vlada B., Stamenković, Olivera S., "Valorization of walnut shell ash as a catalyst for biodiesel production" in Renewable Energy, 147 (2020):1033-1043,
https://doi.org/10.1016/j.renene.2019.09.056 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Milojević, Svetomir
AU  - Bošković-Vragolović, Nevenka
AU  - Pavićević, Vladimir
AU  - Babincev, Ljiljana M.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4252
AB  - The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.
PB  - Chemical Industry Press, Beijing
T2  - Chinese Journal of Chemical Engineering
T1  - A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation
EP  - 612
IS  - 3
SP  - 605
VL  - 27
DO  - 10.1016/j.cjche.2018.06.022
ER  - 

@article{
author = "Marković, Miljana S. and Milojević, Svetomir and Bošković-Vragolović, Nevenka and Pavićević, Vladimir and Babincev, Ljiljana M. and Veljković, Vlada B.",
year = "2019",
abstract = "The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.",
publisher = "Chemical Industry Press, Beijing",
journal = "Chinese Journal of Chemical Engineering",
title = "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation",
pages = "612-605",
number = "3",
volume = "27",
doi = "10.1016/j.cjche.2018.06.022"
}

Marković, M. S., Milojević, S., Bošković-Vragolović, N., Pavićević, V., Babincev, L. M.,& Veljković, V. B.. (2019). A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering
Chemical Industry Press, Beijing., 27(3), 605-612.
https://doi.org/10.1016/j.cjche.2018.06.022

Marković MS, Milojević S, Bošković-Vragolović N, Pavićević V, Babincev LM, Veljković VB. A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering. 2019;27(3):605-612.
doi:10.1016/j.cjche.2018.06.022 .

Marković, Miljana S., Milojević, Svetomir, Bošković-Vragolović, Nevenka, Pavićević, Vladimir, Babincev, Ljiljana M., Veljković, Vlada B., "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation" in Chinese Journal of Chemical Engineering, 27, no. 3 (2019):605-612,
https://doi.org/10.1016/j.cjche.2018.06.022 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Milojević, Svetomir Ž.
AU  - Bošković-Vragolović, Nevenka
AU  - Pavićević, Vladimir P.
AU  - Babincev, Ljiljana М.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5031
AB  - The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.
PB  - Chemical Industry Press
T2  - Chinese Journal of Chemical Engineering
T1  - A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation
EP  - 612
IS  - 3
SP  - 605
VL  - 27
DO  - 10.1016/j.cjche.2018.06.022
ER  - 

@article{
author = "Marković, Miljana S. and Milojević, Svetomir Ž. and Bošković-Vragolović, Nevenka and Pavićević, Vladimir P. and Babincev, Ljiljana М. and Veljković, Vlada B.",
year = "2019",
abstract = "The main objective of the present study was to model the kinetics of essential oil extraction from swelled ground juniper berries by classic hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD). A new phenomenological kinetic model was developed on the basis of the juniper essential oil extraction mechanism that assumed three mass transfer processes occurring simultaneously: washing, unhindered diffusion and hindered diffusion. The new model was compared to the existing kinetic models. Among the tested models, the new model had the smallest mean relative percentage deviation and the highest corrected Akaike information criterion value. In addition, that, the new model was verified for HD and MAHD of essential oils from some other plant materials. On the basis of the above-mentioned facts, the new model can be recommended for modeling the kinetics of essential oil extraction by both HD and MAHD.",
publisher = "Chemical Industry Press",
journal = "Chinese Journal of Chemical Engineering",
title = "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation",
pages = "612-605",
number = "3",
volume = "27",
doi = "10.1016/j.cjche.2018.06.022"
}

Marković, M. S., Milojević, S. Ž., Bošković-Vragolović, N., Pavićević, V. P., Babincev, L. М.,& Veljković, V. B.. (2019). A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering
Chemical Industry Press., 27(3), 605-612.
https://doi.org/10.1016/j.cjche.2018.06.022

Marković MS, Milojević SŽ, Bošković-Vragolović N, Pavićević VP, Babincev LМ, Veljković VB. A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation. in Chinese Journal of Chemical Engineering. 2019;27(3):605-612.
doi:10.1016/j.cjche.2018.06.022 .

Marković, Miljana S., Milojević, Svetomir Ž., Bošković-Vragolović, Nevenka, Pavićević, Vladimir P., Babincev, Ljiljana М., Veljković, Vlada B., "A new kinetic model for the common juniper essenstial oil extraction by microwave hydrodistillation" in Chinese Journal of Chemical Engineering, 27, no. 3 (2019):605-612,
https://doi.org/10.1016/j.cjche.2018.06.022 . .

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Stojković, Ivan
AU  - Velicković, Ana V.
AU  - Stamenković, Olivera S.
AU  - Banković-Ilić, Ivana B.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4067
AB  - Continuous biodiesel production from a waste pig-roasting lard, methanol and KOH was carried out in a reciprocating plate reactor (RPR) using a factorial design containing three process factors, namely methanol/lard molar ratio, catalyst loading, and normalized height of the reactor. The main goals were to optimize the influential process factors with respect to biodiesel purity using the response surface methodology and to model the kinetics of the transesterification reaction in order to describe the change of triacylglycerols (TAG) and fatty acid methyl esters (FAME) concentrations along the RPR height. The first-order rate law was proved for both the reaction and the mass transfer. The model of the changing reaction mechanism and mass transfer of TAG was also applicable. Both kinetic models agreed with the experimental concentrations of TAG and FAME determined along the RPR height.
PB  - Chemical Industry Press Co Ltd, Beijing
T2  - Chinese Journal of Chemical Engineering
T1  - Optimization and kinetic modeling of waste lard methanolysis in a continuous reciprocating plate reactor
EP  - 2490
IS  - 10
SP  - 2481
VL  - 27
DO  - 10.1016/j.cjche.2019.02.019
ER  - 

@article{
author = "Miladinović, Marija R. and Stojković, Ivan and Velicković, Ana V. and Stamenković, Olivera S. and Banković-Ilić, Ivana B. and Veljković, Vlada B.",
year = "2019",
abstract = "Continuous biodiesel production from a waste pig-roasting lard, methanol and KOH was carried out in a reciprocating plate reactor (RPR) using a factorial design containing three process factors, namely methanol/lard molar ratio, catalyst loading, and normalized height of the reactor. The main goals were to optimize the influential process factors with respect to biodiesel purity using the response surface methodology and to model the kinetics of the transesterification reaction in order to describe the change of triacylglycerols (TAG) and fatty acid methyl esters (FAME) concentrations along the RPR height. The first-order rate law was proved for both the reaction and the mass transfer. The model of the changing reaction mechanism and mass transfer of TAG was also applicable. Both kinetic models agreed with the experimental concentrations of TAG and FAME determined along the RPR height.",
publisher = "Chemical Industry Press Co Ltd, Beijing",
journal = "Chinese Journal of Chemical Engineering",
title = "Optimization and kinetic modeling of waste lard methanolysis in a continuous reciprocating plate reactor",
pages = "2490-2481",
number = "10",
volume = "27",
doi = "10.1016/j.cjche.2019.02.019"
}

Miladinović, M. R., Stojković, I., Velicković, A. V., Stamenković, O. S., Banković-Ilić, I. B.,& Veljković, V. B.. (2019). Optimization and kinetic modeling of waste lard methanolysis in a continuous reciprocating plate reactor. in Chinese Journal of Chemical Engineering
Chemical Industry Press Co Ltd, Beijing., 27(10), 2481-2490.
https://doi.org/10.1016/j.cjche.2019.02.019

Miladinović MR, Stojković I, Velicković AV, Stamenković OS, Banković-Ilić IB, Veljković VB. Optimization and kinetic modeling of waste lard methanolysis in a continuous reciprocating plate reactor. in Chinese Journal of Chemical Engineering. 2019;27(10):2481-2490.
doi:10.1016/j.cjche.2019.02.019 .

Miladinović, Marija R., Stojković, Ivan, Velicković, Ana V., Stamenković, Olivera S., Banković-Ilić, Ivana B., Veljković, Vlada B., "Optimization and kinetic modeling of waste lard methanolysis in a continuous reciprocating plate reactor" in Chinese Journal of Chemical Engineering, 27, no. 10 (2019):2481-2490,
https://doi.org/10.1016/j.cjche.2019.02.019 . .

TY  - JOUR
AU  - Avramović, Jelena M.
AU  - Radosavljević, Dragana B.
AU  - Veličković, Ana V.
AU  - Stojković, Ivan
AU  - Stamenković, Olivera S.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4282
AB  - The present study compares the performances of the regression models developed by the response surface methodology combined with the full factorial, Box-Behnken or face central composite designs applied for the ultrasound-assisted KOH-catalyzed methanolysis of sunflower oil. While all models led to similar optimal reaction conditions, the models based on the simpler designs had the smaller corrected Akaike information criterion values, the insignificant lack of fit and the more favorable statistical criteria than the model based on the full factorial design. Including fewer experiments, the Box-Behnken design can be recommended for the optimization of ultrasound-assisted biodiesel production processes.
AB  - U radu se porede performanse regresionih modela razvijenih na osnovu kombinovanja metodologije površine odziva sa punim faktorijelnim, Boks-Benken-ovim ili centralnim kompozitnim planom kada se primene na ultrazvukom podržanu bazno-katalizovanu metanolizu suncokretovog ulja. Iako su svi modeli dali slične optimalne uslove reakcije, modeli zasnovani na jednostavnijim planovima imali su manje vrednosti Akaike-ovog informacionog kriterijuma, neznačajnu vrednost odstupanja od modela i povoljnije statističke kriterijume u odnosu na model zasnovan na punom faktorijelnim planu. Boks-Benken-ov plan, koji zahteva manji broj eksperimenata, može da se preporuči za optimizaciju proizvodnje biodizela u ultrazvučnom reaktoru.
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Statistical modeling and optimization of ultrasound-assisted biodiesel production using various experimental designs
T1  - Statističko modelovanje i optimizacija proizvodnje biodizela u prisustvu ultrazvuka primenom različitih eksperimentalnih planova
EP  - 80
IS  - 1
SP  - 70
VL  - 60
DO  - 10.5937/zasmat1901070A
ER  - 

@article{
author = "Avramović, Jelena M. and Radosavljević, Dragana B. and Veličković, Ana V. and Stojković, Ivan and Stamenković, Olivera S. and Veljković, Vlada B.",
year = "2019",
abstract = "The present study compares the performances of the regression models developed by the response surface methodology combined with the full factorial, Box-Behnken or face central composite designs applied for the ultrasound-assisted KOH-catalyzed methanolysis of sunflower oil. While all models led to similar optimal reaction conditions, the models based on the simpler designs had the smaller corrected Akaike information criterion values, the insignificant lack of fit and the more favorable statistical criteria than the model based on the full factorial design. Including fewer experiments, the Box-Behnken design can be recommended for the optimization of ultrasound-assisted biodiesel production processes., U radu se porede performanse regresionih modela razvijenih na osnovu kombinovanja metodologije površine odziva sa punim faktorijelnim, Boks-Benken-ovim ili centralnim kompozitnim planom kada se primene na ultrazvukom podržanu bazno-katalizovanu metanolizu suncokretovog ulja. Iako su svi modeli dali slične optimalne uslove reakcije, modeli zasnovani na jednostavnijim planovima imali su manje vrednosti Akaike-ovog informacionog kriterijuma, neznačajnu vrednost odstupanja od modela i povoljnije statističke kriterijume u odnosu na model zasnovan na punom faktorijelnim planu. Boks-Benken-ov plan, koji zahteva manji broj eksperimenata, može da se preporuči za optimizaciju proizvodnje biodizela u ultrazvučnom reaktoru.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Statistical modeling and optimization of ultrasound-assisted biodiesel production using various experimental designs, Statističko modelovanje i optimizacija proizvodnje biodizela u prisustvu ultrazvuka primenom različitih eksperimentalnih planova",
pages = "80-70",
number = "1",
volume = "60",
doi = "10.5937/zasmat1901070A"
}

Avramović, J. M., Radosavljević, D. B., Veličković, A. V., Stojković, I., Stamenković, O. S.,& Veljković, V. B.. (2019). Statistical modeling and optimization of ultrasound-assisted biodiesel production using various experimental designs. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 60(1), 70-80.
https://doi.org/10.5937/zasmat1901070A

Avramović JM, Radosavljević DB, Veličković AV, Stojković I, Stamenković OS, Veljković VB. Statistical modeling and optimization of ultrasound-assisted biodiesel production using various experimental designs. in Zaštita materijala. 2019;60(1):70-80.
doi:10.5937/zasmat1901070A .

Avramović, Jelena M., Radosavljević, Dragana B., Veličković, Ana V., Stojković, Ivan, Stamenković, Olivera S., Veljković, Vlada B., "Statistical modeling and optimization of ultrasound-assisted biodiesel production using various experimental designs" in Zaštita materijala, 60, no. 1 (2019):70-80,
https://doi.org/10.5937/zasmat1901070A . .

TY  - JOUR
AU  - Liu, Hui
AU  - Lukić, Ivana
AU  - Miladinović, Marija R.
AU  - Veljković, Vlada B.
AU  - Zdujić, Miodrag
AU  - Zhu, Xiaosun
AU  - Zhang, Yanan
AU  - Skala, Dejan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4016
AB  - The continuous biodiesel production from soybean oil was carried out under the subcritical condition of methanol with MnCO3/Na-silicate as a heterogeneous catalyst. The transesterification rate was first investigated in a set of experiments performed in a batch autoclave at 448 K using methanol-to-oil molar ratio of 18:1 and various catalyst loadings (5, 10 and 20 wt% based on the oil mass). The results from these experiments, as well as the experimental data and the appropriate kinetic model recently reported in the literature were used for designing a packed bed tubular reactor (PBTR), a main unit of the pilot plant with the capacity of 100 L of biodiesel per day. The pilot plant was constructed and tested under various operating conditions. The first 11 h of the pilot-plant operation was realized in the tubular reactor packed with inert glass beads (i.e. without the catalyst) in order to analyze the effect of the non-catalyzed subcritical biodiesel (fatty acid methyl esters, FAME) production. Then, glass beads were replaced with a mix of MnCO3/Na-silicate catalyst particles and glass beads, and the catalytic biodiesel production was continuously run under the subcritical methanol condition for 85 h. Two mass balance tests during the continuous pilot plant operation were performed.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy Conversion and Management
T1  - Continuous biodiesel production under subcritical condition of methanol - Design of pilot plant and packed bed reactor with MnCO3/Na-silicate catalyst
EP  - 504
SP  - 494
VL  - 168
DO  - 10.1016/j.enconman.2018.05.028
ER  - 

@article{
author = "Liu, Hui and Lukić, Ivana and Miladinović, Marija R. and Veljković, Vlada B. and Zdujić, Miodrag and Zhu, Xiaosun and Zhang, Yanan and Skala, Dejan",
year = "2018",
abstract = "The continuous biodiesel production from soybean oil was carried out under the subcritical condition of methanol with MnCO3/Na-silicate as a heterogeneous catalyst. The transesterification rate was first investigated in a set of experiments performed in a batch autoclave at 448 K using methanol-to-oil molar ratio of 18:1 and various catalyst loadings (5, 10 and 20 wt% based on the oil mass). The results from these experiments, as well as the experimental data and the appropriate kinetic model recently reported in the literature were used for designing a packed bed tubular reactor (PBTR), a main unit of the pilot plant with the capacity of 100 L of biodiesel per day. The pilot plant was constructed and tested under various operating conditions. The first 11 h of the pilot-plant operation was realized in the tubular reactor packed with inert glass beads (i.e. without the catalyst) in order to analyze the effect of the non-catalyzed subcritical biodiesel (fatty acid methyl esters, FAME) production. Then, glass beads were replaced with a mix of MnCO3/Na-silicate catalyst particles and glass beads, and the catalytic biodiesel production was continuously run under the subcritical methanol condition for 85 h. Two mass balance tests during the continuous pilot plant operation were performed.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy Conversion and Management",
title = "Continuous biodiesel production under subcritical condition of methanol - Design of pilot plant and packed bed reactor with MnCO3/Na-silicate catalyst",
pages = "504-494",
volume = "168",
doi = "10.1016/j.enconman.2018.05.028"
}

Liu, H., Lukić, I., Miladinović, M. R., Veljković, V. B., Zdujić, M., Zhu, X., Zhang, Y.,& Skala, D.. (2018). Continuous biodiesel production under subcritical condition of methanol - Design of pilot plant and packed bed reactor with MnCO3/Na-silicate catalyst. in Energy Conversion and Management
Pergamon-Elsevier Science Ltd, Oxford., 168, 494-504.
https://doi.org/10.1016/j.enconman.2018.05.028

Liu H, Lukić I, Miladinović MR, Veljković VB, Zdujić M, Zhu X, Zhang Y, Skala D. Continuous biodiesel production under subcritical condition of methanol - Design of pilot plant and packed bed reactor with MnCO3/Na-silicate catalyst. in Energy Conversion and Management. 2018;168:494-504.
doi:10.1016/j.enconman.2018.05.028 .

Liu, Hui, Lukić, Ivana, Miladinović, Marija R., Veljković, Vlada B., Zdujić, Miodrag, Zhu, Xiaosun, Zhang, Yanan, Skala, Dejan, "Continuous biodiesel production under subcritical condition of methanol - Design of pilot plant and packed bed reactor with MnCO3/Na-silicate catalyst" in Energy Conversion and Management, 168 (2018):494-504,
https://doi.org/10.1016/j.enconman.2018.05.028 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Radosavljević, Dragana B.
AU  - Pavićević, Vladimir
AU  - Ristić, Mihailo S.
AU  - Milojević, Svetomir
AU  - Bošković-Vragolović, Nevenka
AU  - Veljković, Vlada B.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3845
AB  - The present paper dealt with the influence of the common juniper berries pretreatment on the yield, chemical composition and extraction kinetics of juniper essential oil (JEO) obtained by classical (HD) and microwave assisted hydrodistillation (MAHD). The highest JEO yield was obtained by HD from one-minute dry-ground juniper berries (2.23 +/- 0.00 g/100 g). No statistically significant influence of swelling and distillation technique on JEO yield was observed. Therefore, the optimal pretreatment process involved no swelling and one-minute grinding. However, no significant difference in the chemical composition of the JEOs obtained by the two techniques was observed. A new phenomenological kinetic model was developed on the basis of the mechanism of JEO extraction by both HD MAHD, which assumed three simultaneously-occurring stages: washing, unhindered diffusion and hindered diffusion. The main advantage of developed model was its ability to describe the variations of JEO yield and distillation rates with time. Furthermore, it had the smallest mean relative percentage deviation compared to the well-known kinetics models and the parameters that all were statistically significant, so it was recommended for modeling the kinetics of JEO extraction by HD and especially MAHD.
PB  - Elsevier Science Bv, Amsterdam
T2  - Industrial Crops and Products
T1  - Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation
EP  - 413
SP  - 402
VL  - 122
DO  - 10.1016/j.indcrop.2018.06.018
ER  - 

@article{
author = "Marković, Miljana S. and Radosavljević, Dragana B. and Pavićević, Vladimir and Ristić, Mihailo S. and Milojević, Svetomir and Bošković-Vragolović, Nevenka and Veljković, Vlada B.",
year = "2018",
abstract = "The present paper dealt with the influence of the common juniper berries pretreatment on the yield, chemical composition and extraction kinetics of juniper essential oil (JEO) obtained by classical (HD) and microwave assisted hydrodistillation (MAHD). The highest JEO yield was obtained by HD from one-minute dry-ground juniper berries (2.23 +/- 0.00 g/100 g). No statistically significant influence of swelling and distillation technique on JEO yield was observed. Therefore, the optimal pretreatment process involved no swelling and one-minute grinding. However, no significant difference in the chemical composition of the JEOs obtained by the two techniques was observed. A new phenomenological kinetic model was developed on the basis of the mechanism of JEO extraction by both HD MAHD, which assumed three simultaneously-occurring stages: washing, unhindered diffusion and hindered diffusion. The main advantage of developed model was its ability to describe the variations of JEO yield and distillation rates with time. Furthermore, it had the smallest mean relative percentage deviation compared to the well-known kinetics models and the parameters that all were statistically significant, so it was recommended for modeling the kinetics of JEO extraction by HD and especially MAHD.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Industrial Crops and Products",
title = "Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation",
pages = "413-402",
volume = "122",
doi = "10.1016/j.indcrop.2018.06.018"
}

Marković, M. S., Radosavljević, D. B., Pavićević, V., Ristić, M. S., Milojević, S., Bošković-Vragolović, N.,& Veljković, V. B.. (2018). Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation. in Industrial Crops and Products
Elsevier Science Bv, Amsterdam., 122, 402-413.
https://doi.org/10.1016/j.indcrop.2018.06.018

Marković MS, Radosavljević DB, Pavićević V, Ristić MS, Milojević S, Bošković-Vragolović N, Veljković VB. Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation. in Industrial Crops and Products. 2018;122:402-413.
doi:10.1016/j.indcrop.2018.06.018 .

Marković, Miljana S., Radosavljević, Dragana B., Pavićević, Vladimir, Ristić, Mihailo S., Milojević, Svetomir, Bošković-Vragolović, Nevenka, Veljković, Vlada B., "Influence of common juniper berries pretreatment on the essential oil yield, chemical composition and extraction kinetics of classical and microwave assisted hydrodistillation" in Industrial Crops and Products, 122 (2018):402-413,
https://doi.org/10.1016/j.indcrop.2018.06.018 . .

TY  - JOUR
AU  - Marković, Miljana S.
AU  - Bošković-Vragolović, Nevenka
AU  - Ristić, Mihailo S.
AU  - Pavićević, Vladimir
AU  - Veljković, Vlada B.
AU  - Milojević, Svetomir
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3646
AB  - This paper deals with fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation (HD) and simultaneous hydrodistillation and rectification (SHDR) at atmospheric pressure. A rectification column was filled with the NORMAG packing A type and had 36 theoretical stages. In the present study, higher essential oil yield was obtained by HD (1.34 mass %) than by SHDR (1.17 mass %). However, mass fraction distributions of monoterpene hydrocarbons (MHs), oxygenated monoterpenes (OMs) and sesquiterpene hydrocarbons (SHs), observed for the two separation methods, differed from each other. In the SHDR process increased contents of high volatile components (predominantly MHs) were obtained in the initial fractions as well as increased contents of low volatile components (dominantly SHs) in the last fractions. Also, this method increased the separation degree of OMs.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification
EP  - 477
IS  - 6
SP  - 471
VL  - 71
DO  - 10.2298/HEMIND161204009M
ER  - 

@article{
author = "Marković, Miljana S. and Bošković-Vragolović, Nevenka and Ristić, Mihailo S. and Pavićević, Vladimir and Veljković, Vlada B. and Milojević, Svetomir",
year = "2017",
abstract = "This paper deals with fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation (HD) and simultaneous hydrodistillation and rectification (SHDR) at atmospheric pressure. A rectification column was filled with the NORMAG packing A type and had 36 theoretical stages. In the present study, higher essential oil yield was obtained by HD (1.34 mass %) than by SHDR (1.17 mass %). However, mass fraction distributions of monoterpene hydrocarbons (MHs), oxygenated monoterpenes (OMs) and sesquiterpene hydrocarbons (SHs), observed for the two separation methods, differed from each other. In the SHDR process increased contents of high volatile components (predominantly MHs) were obtained in the initial fractions as well as increased contents of low volatile components (dominantly SHs) in the last fractions. Also, this method increased the separation degree of OMs.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification",
pages = "477-471",
number = "6",
volume = "71",
doi = "10.2298/HEMIND161204009M"
}

Marković, M. S., Bošković-Vragolović, N., Ristić, M. S., Pavićević, V., Veljković, V. B.,& Milojević, S.. (2017). Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 71(6), 471-477.
https://doi.org/10.2298/HEMIND161204009M

Marković MS, Bošković-Vragolović N, Ristić MS, Pavićević V, Veljković VB, Milojević S. Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification. in Hemijska industrija. 2017;71(6):471-477.
doi:10.2298/HEMIND161204009M .

Marković, Miljana S., Bošković-Vragolović, Nevenka, Ristić, Mihailo S., Pavićević, Vladimir, Veljković, Vlada B., Milojević, Svetomir, "Fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation and rectification" in Hemijska industrija, 71, no. 6 (2017):471-477,
https://doi.org/10.2298/HEMIND161204009M . .

TY  - JOUR
AU  - Kesić, Željka
AU  - Lukić, Ivana
AU  - Zdujić, Miodrag
AU  - Jovalekić, Čedomir
AU  - Veljković, Vlada B.
AU  - Skala, Dejan
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3383
AB  - Calcium-containing perovskites CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 were synthesized by calcination of mechanochemically treated stoichiometric mixtures of CaCO3 and either TiO2, MnO2, ZrO2 or Fe2O3 powders. X-ray diffraction analysis revealed a pure single perovskite phase for all four samples after calcination. This study proved that the pure perovskite phase exhibited low or no catalytic activity at 60 degrees C for the methanolysis of sunflower oil. However, at 165 degrees C FAME yield of more than 90% was reached after 2 h using CaTiO3, CaMnO3 and CaZrO3 as catalyst. Contrary to inactive pure perovskites at 60 degrees C, the CaTiO3 and Ca2Fe2O5 samples containing a very small amount of "free" CaO also showed methanolysis activity at 60 degrees C. This fact can be used to explain some contradictory statements reported in literature related to the perovskites as catalyst for biodiesel synthesis at mild temperatures.
PB  - Elsevier Science Bv, Amsterdam
T2  - Fuel Processing Technology
T1  - Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis
EP  - 168
SP  - 162
VL  - 143
DO  - 10.1016/j.fuproc.2015.11.018
ER  - 

@article{
author = "Kesić, Željka and Lukić, Ivana and Zdujić, Miodrag and Jovalekić, Čedomir and Veljković, Vlada B. and Skala, Dejan",
year = "2016",
abstract = "Calcium-containing perovskites CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 were synthesized by calcination of mechanochemically treated stoichiometric mixtures of CaCO3 and either TiO2, MnO2, ZrO2 or Fe2O3 powders. X-ray diffraction analysis revealed a pure single perovskite phase for all four samples after calcination. This study proved that the pure perovskite phase exhibited low or no catalytic activity at 60 degrees C for the methanolysis of sunflower oil. However, at 165 degrees C FAME yield of more than 90% was reached after 2 h using CaTiO3, CaMnO3 and CaZrO3 as catalyst. Contrary to inactive pure perovskites at 60 degrees C, the CaTiO3 and Ca2Fe2O5 samples containing a very small amount of "free" CaO also showed methanolysis activity at 60 degrees C. This fact can be used to explain some contradictory statements reported in literature related to the perovskites as catalyst for biodiesel synthesis at mild temperatures.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Fuel Processing Technology",
title = "Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis",
pages = "168-162",
volume = "143",
doi = "10.1016/j.fuproc.2015.11.018"
}

Kesić, Ž., Lukić, I., Zdujić, M., Jovalekić, Č., Veljković, V. B.,& Skala, D.. (2016). Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis. in Fuel Processing Technology
Elsevier Science Bv, Amsterdam., 143, 162-168.
https://doi.org/10.1016/j.fuproc.2015.11.018

Kesić Ž, Lukić I, Zdujić M, Jovalekić Č, Veljković VB, Skala D. Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis. in Fuel Processing Technology. 2016;143:162-168.
doi:10.1016/j.fuproc.2015.11.018 .

Kesić, Željka, Lukić, Ivana, Zdujić, Miodrag, Jovalekić, Čedomir, Veljković, Vlada B., Skala, Dejan, "Assessment of CaTiO3, CaMnO3, CaZrO3 and Ca2Fe2O5 perovskites as heterogeneous base catalysts for biodiesel synthesis" in Fuel Processing Technology, 143 (2016):162-168,
https://doi.org/10.1016/j.fuproc.2015.11.018 . .

TY  - JOUR
AU  - Stojković, Ivan
AU  - Miladinović, Marija R.
AU  - Stamenković, Olivera S.
AU  - Banković-Ilić, Ivana B.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3289
AB  - Waste lard from piglet roasting and quicklime (basically CaO) as a priceless fatty feedstock and a cheap solid catalyst, respectively were tested for the biodiesel production by methanolysis in a batch stirred reactor at moderate reaction temperatures (40-60 degrees C) for the kinetic study. For comparison, unheated and heated pork lards, as well as pure CaO, were also included in this study. The mass transfer limitation was observed in the initial period of all methanolysis reactions. The kinetic model combining the changing-and first-order reaction rate laws with respect to triacylglycerols and fatty acid methyl esters (FAMEs), respectively was verified for all three lardy feedstocks and both catalysts. The catalytic activity of quicklime was the same as that of pure CaO. The activation energy was demonstrated to be independent of the feedstock and the catalyst (59.1 +/- 0.6 kJ/mol) but the waste lard reacted faster than the unheated and heated pork lards. At the methanol-to-lard molar ratio of 6:1, the catalyst amount of 5% (based on the lard weight) and the reaction temperature of 60 degrees C, a high FAME concentration in the final ester products (97.5%) within 60 min were achieved with the waste lard and quicklime in two consecutive batches. The same kinetic model was applicable in a continuous packed-bed tubular reactor filled with quicklime bits (2.0-3.15 mm) at the methanol-to-waste lard molar ratio of 6:1, the reaction temperature of 60 degrees C and the residence time of 1 h. Under these conditions, the biodiesel yield was 97.6%, while the FAME concentration in the biodiesel product was 96.5%.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime
EP  - 466
SP  - 454
VL  - 182
DO  - 10.1016/j.fuel.2016.06.014
ER  - 

@article{
author = "Stojković, Ivan and Miladinović, Marija R. and Stamenković, Olivera S. and Banković-Ilić, Ivana B. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2016",
abstract = "Waste lard from piglet roasting and quicklime (basically CaO) as a priceless fatty feedstock and a cheap solid catalyst, respectively were tested for the biodiesel production by methanolysis in a batch stirred reactor at moderate reaction temperatures (40-60 degrees C) for the kinetic study. For comparison, unheated and heated pork lards, as well as pure CaO, were also included in this study. The mass transfer limitation was observed in the initial period of all methanolysis reactions. The kinetic model combining the changing-and first-order reaction rate laws with respect to triacylglycerols and fatty acid methyl esters (FAMEs), respectively was verified for all three lardy feedstocks and both catalysts. The catalytic activity of quicklime was the same as that of pure CaO. The activation energy was demonstrated to be independent of the feedstock and the catalyst (59.1 +/- 0.6 kJ/mol) but the waste lard reacted faster than the unheated and heated pork lards. At the methanol-to-lard molar ratio of 6:1, the catalyst amount of 5% (based on the lard weight) and the reaction temperature of 60 degrees C, a high FAME concentration in the final ester products (97.5%) within 60 min were achieved with the waste lard and quicklime in two consecutive batches. The same kinetic model was applicable in a continuous packed-bed tubular reactor filled with quicklime bits (2.0-3.15 mm) at the methanol-to-waste lard molar ratio of 6:1, the reaction temperature of 60 degrees C and the residence time of 1 h. Under these conditions, the biodiesel yield was 97.6%, while the FAME concentration in the biodiesel product was 96.5%.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime",
pages = "466-454",
volume = "182",
doi = "10.1016/j.fuel.2016.06.014"
}

Stojković, I., Miladinović, M. R., Stamenković, O. S., Banković-Ilić, I. B., Povrenović, D.,& Veljković, V. B.. (2016). Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime. in Fuel
Elsevier Sci Ltd, Oxford., 182, 454-466.
https://doi.org/10.1016/j.fuel.2016.06.014

Stojković I, Miladinović MR, Stamenković OS, Banković-Ilić IB, Povrenović D, Veljković VB. Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime. in Fuel. 2016;182:454-466.
doi:10.1016/j.fuel.2016.06.014 .

Stojković, Ivan, Miladinović, Marija R., Stamenković, Olivera S., Banković-Ilić, Ivana B., Povrenović, Dragan, Veljković, Vlada B., "Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime" in Fuel, 182 (2016):454-466,
https://doi.org/10.1016/j.fuel.2016.06.014 . .

TY  - JOUR
AU  - Stojković, Ivan
AU  - Banković-Ilić, Ivana B.
AU  - Velicković, Ana V.
AU  - Avramović, Jelena M.
AU  - Stamenković, Olivera S.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3424
AB  - The KOH-catalyzed methanolysis of waste lard from piglet roasting in a moderate temperature range was investigated in order to establish the reaction kinetics. For comparison, lard and thermally treated lard were also included in the study. All three reactions occurred via a pseudo-homogeneous regime where the chemical reaction controlled the overall process kinetics. A simple kinetic model comprising the irreversible pseudo-first-order reaction was demonstrated for all three fatty feedstocks. The reaction rate constant increases with raising the fatty acid unsaturation degree. The final products satisfied the EN 14214 biodiesel standard specifications.
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Chemical Engineering & Technology
T1  - Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures
EP  - 750
IS  - 4
SP  - 741
VL  - 39
DO  - 10.1002/ceat.201400705
ER  - 

@article{
author = "Stojković, Ivan and Banković-Ilić, Ivana B. and Velicković, Ana V. and Avramović, Jelena M. and Stamenković, Olivera S. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2016",
abstract = "The KOH-catalyzed methanolysis of waste lard from piglet roasting in a moderate temperature range was investigated in order to establish the reaction kinetics. For comparison, lard and thermally treated lard were also included in the study. All three reactions occurred via a pseudo-homogeneous regime where the chemical reaction controlled the overall process kinetics. A simple kinetic model comprising the irreversible pseudo-first-order reaction was demonstrated for all three fatty feedstocks. The reaction rate constant increases with raising the fatty acid unsaturation degree. The final products satisfied the EN 14214 biodiesel standard specifications.",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Chemical Engineering & Technology",
title = "Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures",
pages = "750-741",
number = "4",
volume = "39",
doi = "10.1002/ceat.201400705"
}

Stojković, I., Banković-Ilić, I. B., Velicković, A. V., Avramović, J. M., Stamenković, O. S., Povrenović, D.,& Veljković, V. B.. (2016). Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures. in Chemical Engineering & Technology
Wiley-VCH Verlag Gmbh, Weinheim., 39(4), 741-750.
https://doi.org/10.1002/ceat.201400705

Stojković I, Banković-Ilić IB, Velicković AV, Avramović JM, Stamenković OS, Povrenović D, Veljković VB. Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures. in Chemical Engineering & Technology. 2016;39(4):741-750.
doi:10.1002/ceat.201400705 .

Stojković, Ivan, Banković-Ilić, Ivana B., Velicković, Ana V., Avramović, Jelena M., Stamenković, Olivera S., Povrenović, Dragan, Veljković, Vlada B., "Waste Lard Methanolysis Catalyzed by KOH at Moderate Temperatures" in Chemical Engineering & Technology, 39, no. 4 (2016):741-750,
https://doi.org/10.1002/ceat.201400705 . .

TY  - JOUR
AU  - Pavićević, Vladimir
AU  - Marković, Miljana S.
AU  - Milojević, Svetomir
AU  - Ristić, Mihailo S.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3460
AB  - BACKGROUNDMicrowave-assisted hydrodistillation (MAHD) has widely been used to isolate essential oil from various plant materials, but it has not been applied yet to extract essential oil from juniper berries. The main goals of the present work were to establish a model describing the extraction kinetics and the chemical composition of the essential oil obtained. RESULTSA lower final essential oil yield from juniper berries was obtained by MAHD than by conventional hydrodistillation (HD). No significant differences in chemical compositions of the essential oils extracted by the two techniques were observed. The mechanism of both processes was the same and included fast (washing) and slow (diffusion) distillation of essential oil that occurred simultaneously. CONCLUSIONThe kinetic model involving simultaneous washing and diffusion of essential oil was verified for various plant materials (areal parts of savory and thyme, fennel seeds and juniper berries) for both MAHD and HD that indicated its general importance. For the first time, the kinetic models of MAHD and HD were compared. Knowledge of the juniper berry essential oil yield and the extraction kinetics is of importance from the technological and economics points of view, while the chemical composition determines its use.
PB  - Wiley, Hoboken
T2  - Journal of Chemical Technology and Biotechnology
T1  - Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition
EP  - 891
IS  - 4
SP  - 883
VL  - 91
DO  - 10.1002/jctb.4653
ER  - 

@article{
author = "Pavićević, Vladimir and Marković, Miljana S. and Milojević, Svetomir and Ristić, Mihailo S. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2016",
abstract = "BACKGROUNDMicrowave-assisted hydrodistillation (MAHD) has widely been used to isolate essential oil from various plant materials, but it has not been applied yet to extract essential oil from juniper berries. The main goals of the present work were to establish a model describing the extraction kinetics and the chemical composition of the essential oil obtained. RESULTSA lower final essential oil yield from juniper berries was obtained by MAHD than by conventional hydrodistillation (HD). No significant differences in chemical compositions of the essential oils extracted by the two techniques were observed. The mechanism of both processes was the same and included fast (washing) and slow (diffusion) distillation of essential oil that occurred simultaneously. CONCLUSIONThe kinetic model involving simultaneous washing and diffusion of essential oil was verified for various plant materials (areal parts of savory and thyme, fennel seeds and juniper berries) for both MAHD and HD that indicated its general importance. For the first time, the kinetic models of MAHD and HD were compared. Knowledge of the juniper berry essential oil yield and the extraction kinetics is of importance from the technological and economics points of view, while the chemical composition determines its use.",
publisher = "Wiley, Hoboken",
journal = "Journal of Chemical Technology and Biotechnology",
title = "Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition",
pages = "891-883",
number = "4",
volume = "91",
doi = "10.1002/jctb.4653"
}

Pavićević, V., Marković, M. S., Milojević, S., Ristić, M. S., Povrenović, D.,& Veljković, V. B.. (2016). Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition. in Journal of Chemical Technology and Biotechnology
Wiley, Hoboken., 91(4), 883-891.
https://doi.org/10.1002/jctb.4653

Pavićević V, Marković MS, Milojević S, Ristić MS, Povrenović D, Veljković VB. Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition. in Journal of Chemical Technology and Biotechnology. 2016;91(4):883-891.
doi:10.1002/jctb.4653 .

Pavićević, Vladimir, Marković, Miljana S., Milojević, Svetomir, Ristić, Mihailo S., Povrenović, Dragan, Veljković, Vlada B., "Microwave-assisted hydrodistillation of juniper berry essential oil: kinetic modeling and chemical composition" in Journal of Chemical Technology and Biotechnology, 91, no. 4 (2016):883-891,
https://doi.org/10.1002/jctb.4653 . .

TY  - JOUR
AU  - Ivaniš, Gorica
AU  - Radović, Ivona
AU  - Veljković, Vlada B.
AU  - Kijevčanin, Mirjana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3401
AB  - Knowledge of the basic thermodynamic properties of biodiesel under different conditions is necessary because of its wide use as a substitute for fossil fuels. The viscosities and refractive indices of the methyl and ethyl esters of the fatty acids from sunflower oil were measured at atmospheric pressure and at temperatures 288.15-373.15 K and 288.15-343.15 K, respectively. The same properties were measured also for the methyl esters of the fatty acids from lard at atmospheric pressure and at temperatures 298.15-373.15 K and 298.15-343.15 K, respectively. The densities of the mentioned biodiesel samples were measured at temperatures up to 413.15 K and at pressures 0.1-60 MPa. The experimental density values were correlated using the modified Tammann-Tait equation. Based on the obtained results, thermodynamic behavior, such as the isothermal compressibility, the isobaric thermal expansivity, the internal pressure and the difference between the specific heat capacity at constant pressure and at constant volume, were calculated. The absolute average deviations between measured densities and those calculated using the modified Tammann-Tait equation of about 0.006% for all of the three examined samples confirm the accuracy of the modeling and reliability of the calculated derived properties.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Biodiesel density and derived thermodynamic properties at high pressures and moderate temperatures
EP  - 251
SP  - 244
VL  - 165
DO  - 10.1016/j.fuel.2015.10.050
ER  - 

@article{
author = "Ivaniš, Gorica and Radović, Ivona and Veljković, Vlada B. and Kijevčanin, Mirjana",
year = "2016",
abstract = "Knowledge of the basic thermodynamic properties of biodiesel under different conditions is necessary because of its wide use as a substitute for fossil fuels. The viscosities and refractive indices of the methyl and ethyl esters of the fatty acids from sunflower oil were measured at atmospheric pressure and at temperatures 288.15-373.15 K and 288.15-343.15 K, respectively. The same properties were measured also for the methyl esters of the fatty acids from lard at atmospheric pressure and at temperatures 298.15-373.15 K and 298.15-343.15 K, respectively. The densities of the mentioned biodiesel samples were measured at temperatures up to 413.15 K and at pressures 0.1-60 MPa. The experimental density values were correlated using the modified Tammann-Tait equation. Based on the obtained results, thermodynamic behavior, such as the isothermal compressibility, the isobaric thermal expansivity, the internal pressure and the difference between the specific heat capacity at constant pressure and at constant volume, were calculated. The absolute average deviations between measured densities and those calculated using the modified Tammann-Tait equation of about 0.006% for all of the three examined samples confirm the accuracy of the modeling and reliability of the calculated derived properties.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Biodiesel density and derived thermodynamic properties at high pressures and moderate temperatures",
pages = "251-244",
volume = "165",
doi = "10.1016/j.fuel.2015.10.050"
}

Ivaniš, G., Radović, I., Veljković, V. B.,& Kijevčanin, M.. (2016). Biodiesel density and derived thermodynamic properties at high pressures and moderate temperatures. in Fuel
Elsevier Sci Ltd, Oxford., 165, 244-251.
https://doi.org/10.1016/j.fuel.2015.10.050

Ivaniš G, Radović I, Veljković VB, Kijevčanin M. Biodiesel density and derived thermodynamic properties at high pressures and moderate temperatures. in Fuel. 2016;165:244-251.
doi:10.1016/j.fuel.2015.10.050 .

Ivaniš, Gorica, Radović, Ivona, Veljković, Vlada B., Kijevčanin, Mirjana, "Biodiesel density and derived thermodynamic properties at high pressures and moderate temperatures" in Fuel, 165 (2016):244-251,
https://doi.org/10.1016/j.fuel.2015.10.050 . .

TY  - JOUR
AU  - Ivaniš, Gorica
AU  - Radović, Ivona
AU  - Veljković, Vlada B.
AU  - Kijevčanin, Mirjana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3232
AB  - One of the solutions to greenhouse gases emission is the use of biodiesels, since their mixtures with petro-diesel can be used as fuel in existing diesel engines without additional corrections in engines' design. In order to estimate engine performance and increase its efficiency, it is necessary to know the basic properties of fuels under different operating conditions, and among the most important ones are density and viscosity. Therefore, the densities of pure petro-diesel, as well as densities of its blends with sunflower oil methyl and ethyl esters, in the ratio of 10 vol% and 20 vol% of the biodiesel, at temperatures 293.15-413.15 K and at pressures of 0.1-60 MPa, are presented here. Measurements were taken at an Anton Paar DMA HP densimeter. For the device calibration the classical calibration method with one reference fluid was applied. Also, for the same samples, the viscosities at 288.15-373.15 K and the refractive indices at 288.15-343.15 K at atmospheric pressure were measured. Measured densities decrease linearly as temperature rises along isobars and increase with pressure rise at a constant temperature for all examined samples. Refractive index, also, decreases linearly with temperature rise, while viscosity decreases exponentially with increase in temperature. Densities and refractive indices are higher for blends with sunflower oil methyl esters than with its ethyl esters, opposite to viscosity. Densities of blends increase linearly with rise in biodiesel share, while the increase of viscosity is exponential. Density data were fitted to the modified Tammann-Tait equation and the obtained results were used for calculation of derived thermodynamic properties such as the isothermal compressibility, the isobaric thermal expansivity, the internal pressure and the difference between specific heat capacity at constant pressure and the specific heat capacity at constant volume. The absolute average percentage deviations of the measured densities from those calculated using the modified Tammann-Tait equation were about 0.01%, for all studied samples, assessing positively the correlation procedure. The dependence of the measured and calculated properties of the blends on biodiesel amount was also examined.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Thermodynamic properties of biodiesel and petro-diesel blends at high pressures and temperatures. Experimental and modeling
EP  - 288
SP  - 277
VL  - 184
DO  - 10.1016/j.fuel.2016.07.023
ER  - 

@article{
author = "Ivaniš, Gorica and Radović, Ivona and Veljković, Vlada B. and Kijevčanin, Mirjana",
year = "2016",
abstract = "One of the solutions to greenhouse gases emission is the use of biodiesels, since their mixtures with petro-diesel can be used as fuel in existing diesel engines without additional corrections in engines' design. In order to estimate engine performance and increase its efficiency, it is necessary to know the basic properties of fuels under different operating conditions, and among the most important ones are density and viscosity. Therefore, the densities of pure petro-diesel, as well as densities of its blends with sunflower oil methyl and ethyl esters, in the ratio of 10 vol% and 20 vol% of the biodiesel, at temperatures 293.15-413.15 K and at pressures of 0.1-60 MPa, are presented here. Measurements were taken at an Anton Paar DMA HP densimeter. For the device calibration the classical calibration method with one reference fluid was applied. Also, for the same samples, the viscosities at 288.15-373.15 K and the refractive indices at 288.15-343.15 K at atmospheric pressure were measured. Measured densities decrease linearly as temperature rises along isobars and increase with pressure rise at a constant temperature for all examined samples. Refractive index, also, decreases linearly with temperature rise, while viscosity decreases exponentially with increase in temperature. Densities and refractive indices are higher for blends with sunflower oil methyl esters than with its ethyl esters, opposite to viscosity. Densities of blends increase linearly with rise in biodiesel share, while the increase of viscosity is exponential. Density data were fitted to the modified Tammann-Tait equation and the obtained results were used for calculation of derived thermodynamic properties such as the isothermal compressibility, the isobaric thermal expansivity, the internal pressure and the difference between specific heat capacity at constant pressure and the specific heat capacity at constant volume. The absolute average percentage deviations of the measured densities from those calculated using the modified Tammann-Tait equation were about 0.01%, for all studied samples, assessing positively the correlation procedure. The dependence of the measured and calculated properties of the blends on biodiesel amount was also examined.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Thermodynamic properties of biodiesel and petro-diesel blends at high pressures and temperatures. Experimental and modeling",
pages = "288-277",
volume = "184",
doi = "10.1016/j.fuel.2016.07.023"
}

Ivaniš, G., Radović, I., Veljković, V. B.,& Kijevčanin, M.. (2016). Thermodynamic properties of biodiesel and petro-diesel blends at high pressures and temperatures. Experimental and modeling. in Fuel
Elsevier Sci Ltd, Oxford., 184, 277-288.
https://doi.org/10.1016/j.fuel.2016.07.023

Ivaniš G, Radović I, Veljković VB, Kijevčanin M. Thermodynamic properties of biodiesel and petro-diesel blends at high pressures and temperatures. Experimental and modeling. in Fuel. 2016;184:277-288.
doi:10.1016/j.fuel.2016.07.023 .

Ivaniš, Gorica, Radović, Ivona, Veljković, Vlada B., Kijevčanin, Mirjana, "Thermodynamic properties of biodiesel and petro-diesel blends at high pressures and temperatures. Experimental and modeling" in Fuel, 184 (2016):277-288,
https://doi.org/10.1016/j.fuel.2016.07.023 . .

TY  - JOUR
AU  - Tasić, Marija B.
AU  - Miladinović, Marija R.
AU  - Stamenković, Olivera S.
AU  - Veljković, Vlada B.
AU  - Skala, Dejan U.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5763
AB  - The kinetic model originally developed for quicklime-catalyzed methanolysis of sunflower oil was tested for another three calcium-based catalysts, namely, neat CaO, Ca(OH)2, and CaO·ZnO. This model includes the changing reaction mechanism and the triacylglycerol (TAG) mass transfer. The applicability and generalization capability of this model for heterogeneous methanolysis reaction catalyzed by calcium-based catalysts was evaluated. As indicated by the high coefficient of determination and the relatively small mean relative percentage deviation, the model was a reliable predictor of the time variation of TAG conversion degree in the sunflower oil methanolysis over all four calcium-based catalysts within the ranges of the reaction conditions applied. This model is recommended in general for describing the kinetics of sunflower oil methanolysis over calcium-based catalysts.The kinetic model originally developed for quicklime-catalyzed methanolysis of sunflower oil was tested for another three calcium-based catalysts, namely, neat CaO, Ca(OH)2, and CaO·ZnO. This model includes the changing reaction mechanism and the triacylglycerol (TAG) mass transfer. The applicability and generalization capability of this model for heterogeneous methanolysis reaction catalyzed by calcium-based catalysts was evaluated. As indicated by the high coefficient of determination and the relatively small mean relative percentage deviation, the model was a reliable predictor of the time variation of TAG conversion degree in the sunflower oil methanolysis over all four calcium-based catalysts within the ranges of the reaction conditions applied. This model is recommended in general for describing the kinetics of sunflower oil methanolysis over calcium-based catalysts.
PB  - Wiley-VCH Verlag
T2  - Chemical Engineering and Technology
T1  - Kinetic Modeling of Sunflower Oil Methanolysis Catalyzed by Calcium-Based Catalysts
EP  - 1556
IS  - 9
SP  - 1550
VL  - 38
DO  - 10.1002/ceat.201500076
ER  - 

@article{
author = "Tasić, Marija B. and Miladinović, Marija R. and Stamenković, Olivera S. and Veljković, Vlada B. and Skala, Dejan U.",
year = "2015",
abstract = "The kinetic model originally developed for quicklime-catalyzed methanolysis of sunflower oil was tested for another three calcium-based catalysts, namely, neat CaO, Ca(OH)2, and CaO·ZnO. This model includes the changing reaction mechanism and the triacylglycerol (TAG) mass transfer. The applicability and generalization capability of this model for heterogeneous methanolysis reaction catalyzed by calcium-based catalysts was evaluated. As indicated by the high coefficient of determination and the relatively small mean relative percentage deviation, the model was a reliable predictor of the time variation of TAG conversion degree in the sunflower oil methanolysis over all four calcium-based catalysts within the ranges of the reaction conditions applied. This model is recommended in general for describing the kinetics of sunflower oil methanolysis over calcium-based catalysts.The kinetic model originally developed for quicklime-catalyzed methanolysis of sunflower oil was tested for another three calcium-based catalysts, namely, neat CaO, Ca(OH)2, and CaO·ZnO. This model includes the changing reaction mechanism and the triacylglycerol (TAG) mass transfer. The applicability and generalization capability of this model for heterogeneous methanolysis reaction catalyzed by calcium-based catalysts was evaluated. As indicated by the high coefficient of determination and the relatively small mean relative percentage deviation, the model was a reliable predictor of the time variation of TAG conversion degree in the sunflower oil methanolysis over all four calcium-based catalysts within the ranges of the reaction conditions applied. This model is recommended in general for describing the kinetics of sunflower oil methanolysis over calcium-based catalysts.",
publisher = "Wiley-VCH Verlag",
journal = "Chemical Engineering and Technology",
title = "Kinetic Modeling of Sunflower Oil Methanolysis Catalyzed by Calcium-Based Catalysts",
pages = "1556-1550",
number = "9",
volume = "38",
doi = "10.1002/ceat.201500076"
}

Tasić, M. B., Miladinović, M. R., Stamenković, O. S., Veljković, V. B.,& Skala, D. U.. (2015). Kinetic Modeling of Sunflower Oil Methanolysis Catalyzed by Calcium-Based Catalysts. in Chemical Engineering and Technology
Wiley-VCH Verlag., 38(9), 1550-1556.
https://doi.org/10.1002/ceat.201500076

Tasić MB, Miladinović MR, Stamenković OS, Veljković VB, Skala DU. Kinetic Modeling of Sunflower Oil Methanolysis Catalyzed by Calcium-Based Catalysts. in Chemical Engineering and Technology. 2015;38(9):1550-1556.
doi:10.1002/ceat.201500076 .

Tasić, Marija B., Miladinović, Marija R., Stamenković, Olivera S., Veljković, Vlada B., Skala, Dejan U., "Kinetic Modeling of Sunflower Oil Methanolysis Catalyzed by Calcium-Based Catalysts" in Chemical Engineering and Technology, 38, no. 9 (2015):1550-1556,
https://doi.org/10.1002/ceat.201500076 . .

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Stamenković, Olivera S.
AU  - Veljković, Vlada B.
AU  - Skala, Dejan U.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5762
AB  - The continuous sunflower oil methanolysis catalyzed by quicklime in a packed-bed tubular reactor of 60 cm height was studied at 60 °C using methanol-to-oil molar ratios from 6:1 to 18:1 and weight hourly space velocities from 0.188 to 0.376 (kg/kgcat h). The main goal was to establish the effect of the process variables on the fatty acid methyl esters (FAME) synthesis. A full factorial design was used to evaluate the significance of the three process factors (methanol-to-oil molar ratio, flow rate of the reactants and bed height) statistically. Moreover, the recently reported kinetic model of methanolysis was used to describe variations of FAME and triacylglycerols (TAG) concentrations along the reactor length. The kinetic model predicted the axial concentration profiles of TAG and FAME in the reactor with acceptable accuracy. A high FAME content (98.5%) could be achieved at the two thirds of the bed of quicklime bits without loss of catalytic activity within 30 h of continuous operation.
PB  - Elsevier Ltd
T2  - Fuel
T1  - Continuous sunflower oil methanolysis over quicklime in a packed-bed tubular reactor
EP  - 307
SP  - 301
VL  - 154
DO  - 10.1016/j.fuel.2015.03.057
ER  - 

@article{
author = "Miladinović, Marija R. and Stamenković, Olivera S. and Veljković, Vlada B. and Skala, Dejan U.",
year = "2015",
abstract = "The continuous sunflower oil methanolysis catalyzed by quicklime in a packed-bed tubular reactor of 60 cm height was studied at 60 °C using methanol-to-oil molar ratios from 6:1 to 18:1 and weight hourly space velocities from 0.188 to 0.376 (kg/kgcat h). The main goal was to establish the effect of the process variables on the fatty acid methyl esters (FAME) synthesis. A full factorial design was used to evaluate the significance of the three process factors (methanol-to-oil molar ratio, flow rate of the reactants and bed height) statistically. Moreover, the recently reported kinetic model of methanolysis was used to describe variations of FAME and triacylglycerols (TAG) concentrations along the reactor length. The kinetic model predicted the axial concentration profiles of TAG and FAME in the reactor with acceptable accuracy. A high FAME content (98.5%) could be achieved at the two thirds of the bed of quicklime bits without loss of catalytic activity within 30 h of continuous operation.",
publisher = "Elsevier Ltd",
journal = "Fuel",
title = "Continuous sunflower oil methanolysis over quicklime in a packed-bed tubular reactor",
pages = "307-301",
volume = "154",
doi = "10.1016/j.fuel.2015.03.057"
}

Miladinović, M. R., Stamenković, O. S., Veljković, V. B.,& Skala, D. U.. (2015). Continuous sunflower oil methanolysis over quicklime in a packed-bed tubular reactor. in Fuel
Elsevier Ltd., 154, 301-307.
https://doi.org/10.1016/j.fuel.2015.03.057

Miladinović MR, Stamenković OS, Veljković VB, Skala DU. Continuous sunflower oil methanolysis over quicklime in a packed-bed tubular reactor. in Fuel. 2015;154:301-307.
doi:10.1016/j.fuel.2015.03.057 .

Miladinović, Marija R., Stamenković, Olivera S., Veljković, Vlada B., Skala, Dejan U., "Continuous sunflower oil methanolysis over quicklime in a packed-bed tubular reactor" in Fuel, 154 (2015):301-307,
https://doi.org/10.1016/j.fuel.2015.03.057 . .

TY  - JOUR
AU  - Stojković, Ivan
AU  - Stamenković, Olivera S.
AU  - Povrenović, Dragan
AU  - Veljković, Vlada B.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2838
AB  - For commercial application, the ester product of alkali-catalyzed transesterification of vegetable oil or animal fats should be refined after glycerol separation by settling to fulfill the biodiesel standard specifications. This crude biodiesel, after neutralization and methanol removal, should be further cleaned by either one of the following methods: wet washing, dry washing, membrane extraction or using ion liquids. This paper presents a review on the traditional (wet and dry washing) and novel (membrane separation technology and usage of ion liquids) methods of crude biodiesel purification. It also provides a comparison of crude biodiesel purification methods. Each method has its advantages and disadvantages, which should be carefully analyzed when choosing the proper one for refining crude biodiesel.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Renewable & Sustainable Energy Reviews
T1  - Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification
EP  - 15
SP  - 1
VL  - 32
DO  - 10.1016/j.rser.2014.01.005
ER  - 

@article{
author = "Stojković, Ivan and Stamenković, Olivera S. and Povrenović, Dragan and Veljković, Vlada B.",
year = "2014",
abstract = "For commercial application, the ester product of alkali-catalyzed transesterification of vegetable oil or animal fats should be refined after glycerol separation by settling to fulfill the biodiesel standard specifications. This crude biodiesel, after neutralization and methanol removal, should be further cleaned by either one of the following methods: wet washing, dry washing, membrane extraction or using ion liquids. This paper presents a review on the traditional (wet and dry washing) and novel (membrane separation technology and usage of ion liquids) methods of crude biodiesel purification. It also provides a comparison of crude biodiesel purification methods. Each method has its advantages and disadvantages, which should be carefully analyzed when choosing the proper one for refining crude biodiesel.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Renewable & Sustainable Energy Reviews",
title = "Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification",
pages = "15-1",
volume = "32",
doi = "10.1016/j.rser.2014.01.005"
}

Stojković, I., Stamenković, O. S., Povrenović, D.,& Veljković, V. B.. (2014). Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification. in Renewable & Sustainable Energy Reviews
Pergamon-Elsevier Science Ltd, Oxford., 32, 1-15.
https://doi.org/10.1016/j.rser.2014.01.005

Stojković I, Stamenković OS, Povrenović D, Veljković VB. Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification. in Renewable & Sustainable Energy Reviews. 2014;32:1-15.
doi:10.1016/j.rser.2014.01.005 .

Stojković, Ivan, Stamenković, Olivera S., Povrenović, Dragan, Veljković, Vlada B., "Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification" in Renewable & Sustainable Energy Reviews, 32 (2014):1-15,
https://doi.org/10.1016/j.rser.2014.01.005 . .

TY  - JOUR
AU  - Banković-Ilić, Ivana B.
AU  - Stojković, Ivan
AU  - Stamenković, Olivera S.
AU  - Veljković, Vlada B.
AU  - Hung, Yung-Tse
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2839
AB  - Biodiesel, an alternate and ecologically acceptable substitute for the conventional fuel, is usually produced from a wide range of edible vegetable oils, which are normally used for human consumption and whose prices are expected to increase in the future. In this regard, reliable and low-cost raw materials have increasingly drawn interest for biodiesel production, such as by-products of the meat-processing industries or waste animal fats. This paper provides a review of the different methods employed for biodiesel production from waste animal fats employing transesterification reaction. The aim of this paper is to present the exploitation possibilities of waste animal fats as low-cost feedstocks for biodiesel production. Also, the various methods for treatment of waste animal fats such as chemical (homogeneous and heterogeneous) and enzyme catalysis as well as non-catalytic processes were considered with emphasis on the influence of the operating and reaction conditions on the process rate and the ester yield. In depth discussions were given to the process optimization, kinetics and possibilities for improvement of biodiesel production from waste animal.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Renewable & Sustainable Energy Reviews
T1  - Waste animal fats as feedstocks for biodiesel production
EP  - 254
SP  - 238
VL  - 32
DO  - 10.1016/j.rser.2014.01.038
ER  - 

@article{
author = "Banković-Ilić, Ivana B. and Stojković, Ivan and Stamenković, Olivera S. and Veljković, Vlada B. and Hung, Yung-Tse",
year = "2014",
abstract = "Biodiesel, an alternate and ecologically acceptable substitute for the conventional fuel, is usually produced from a wide range of edible vegetable oils, which are normally used for human consumption and whose prices are expected to increase in the future. In this regard, reliable and low-cost raw materials have increasingly drawn interest for biodiesel production, such as by-products of the meat-processing industries or waste animal fats. This paper provides a review of the different methods employed for biodiesel production from waste animal fats employing transesterification reaction. The aim of this paper is to present the exploitation possibilities of waste animal fats as low-cost feedstocks for biodiesel production. Also, the various methods for treatment of waste animal fats such as chemical (homogeneous and heterogeneous) and enzyme catalysis as well as non-catalytic processes were considered with emphasis on the influence of the operating and reaction conditions on the process rate and the ester yield. In depth discussions were given to the process optimization, kinetics and possibilities for improvement of biodiesel production from waste animal.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Renewable & Sustainable Energy Reviews",
title = "Waste animal fats as feedstocks for biodiesel production",
pages = "254-238",
volume = "32",
doi = "10.1016/j.rser.2014.01.038"
}

Banković-Ilić, I. B., Stojković, I., Stamenković, O. S., Veljković, V. B.,& Hung, Y.. (2014). Waste animal fats as feedstocks for biodiesel production. in Renewable & Sustainable Energy Reviews
Pergamon-Elsevier Science Ltd, Oxford., 32, 238-254.
https://doi.org/10.1016/j.rser.2014.01.038

Banković-Ilić IB, Stojković I, Stamenković OS, Veljković VB, Hung Y. Waste animal fats as feedstocks for biodiesel production. in Renewable & Sustainable Energy Reviews. 2014;32:238-254.
doi:10.1016/j.rser.2014.01.038 .

Banković-Ilić, Ivana B., Stojković, Ivan, Stamenković, Olivera S., Veljković, Vlada B., Hung, Yung-Tse, "Waste animal fats as feedstocks for biodiesel production" in Renewable & Sustainable Energy Reviews, 32 (2014):238-254,
https://doi.org/10.1016/j.rser.2014.01.038 . .

TY  - JOUR
AU  - Milojević, Svetomir
AU  - Radosavljević, Dragana B.
AU  - Pavićević, Vladimir
AU  - Pejanović, Srđan
AU  - Veljković, Vlada B.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2345
AB  - The present work deals with the modeling of the kinetics of essential oils extraction from plant materials by water and steam distillation. The experimental data were obtained by studying the hydrodistillation kinetics of essential oil from juniper berries. The literature data on the kinetics of essential oils hydrodistillation from different plant materials were also included into the modeling. A physical model based on simultaneous washing and diffusion of essential oil from plant materials were developed to describe the kinetics of essential oils hydrodistillation, and two other simpler models were derived from this physical model assuming either instantaneous washing followed by diffusion or diffusion with no washing (i.e., first-order kinetics). The main goal was to compare these models and suggest the optimum ones for water and steam distillation and for different plant materials. All three models described well the experimental kinetic data on water distillation irrespective of the type of distillation equipment and its scale, the type of plant materials and the operational conditions. The most applicable model is the one involving simultaneous washing and diffusion of the essential oil. However, this model was generally inapplicable for steam distillation of essential oils, except for juniper berries. For this hydrodistillation technique, the pseudo first-order model was shown to be the best one. In a few cases, a variation of the essential oil yield with time was observed to be sigmoidal and was modeled by the Boltzmann sigmoid function.
AB  - Rad se bavi modelovanjem kinetike ekstrakcije etarskog ulja iz biljnih materijala primenom destilacija vodom i vodenom parom. Eksperimentalni podaci dobijeni su proučavanjem kinetike hidrodestilacije etarskog ulja ploda kleke. Literaturni podaci o kinetici hidrodestilacije etarskog ulja iz različitih biljnih materijala su, takođe, uključeni u modelovanje. Za opisivanje kinetike hidrodestilacije etarskog ulja razvijen je fizički model koji je zasnovan na istovremenom ispiranju i difuziji etarskog ulja iz biljnog materijala. Iz ovog modela izvedena su dva prostija modela od kojih je prvi zasnovan na trenutnom ispiranju praćenim difuzijom a drugi na difuziji bez ispiranja (tj.na kinetici prvog reda). Glavni cilj je bio poređenje ovih modela i predlaganje optimalnog za destilacije vodom i vodenom parom I za različite biljne materijale. Sva tri modela opisuju dobro eksperimentalne kinetičke podatke u slučaju destilacije vodom nezavisno od tipa destilatora i njegove veličine, tipa biljnog materijala i procesnih uslova, ali je najbolji model koji uključuje istovremeno ispiranje i difuziju etarskog ulja. Ovaj model je, međutim, neprimenljiv za vodeno-parnu destilaciju etarskog ulja, izuzev za etarsko ulje ploda kleke. Za ovu destilaciju etarskog ulja najbolji je kinetički model pseudo-prvog reda. U slučaju nekoliko biljnih materijala, promena prinosa etarskog ulja sa vremenom je sigmoidna, pa je modelovana Bolcmanovom sigmoidnom funkcijom.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Modeling the kinetics of essential oil hydrodistillation from plant materials
T1  - Modelovanje kinetike hidrodestilacije etarskog ulja iz biljnih materijala
EP  - 859
IS  - 5
SP  - 843
VL  - 67
DO  - 10.2298/HEMIND121026009M
ER  - 

@article{
author = "Milojević, Svetomir and Radosavljević, Dragana B. and Pavićević, Vladimir and Pejanović, Srđan and Veljković, Vlada B.",
year = "2013",
abstract = "The present work deals with the modeling of the kinetics of essential oils extraction from plant materials by water and steam distillation. The experimental data were obtained by studying the hydrodistillation kinetics of essential oil from juniper berries. The literature data on the kinetics of essential oils hydrodistillation from different plant materials were also included into the modeling. A physical model based on simultaneous washing and diffusion of essential oil from plant materials were developed to describe the kinetics of essential oils hydrodistillation, and two other simpler models were derived from this physical model assuming either instantaneous washing followed by diffusion or diffusion with no washing (i.e., first-order kinetics). The main goal was to compare these models and suggest the optimum ones for water and steam distillation and for different plant materials. All three models described well the experimental kinetic data on water distillation irrespective of the type of distillation equipment and its scale, the type of plant materials and the operational conditions. The most applicable model is the one involving simultaneous washing and diffusion of the essential oil. However, this model was generally inapplicable for steam distillation of essential oils, except for juniper berries. For this hydrodistillation technique, the pseudo first-order model was shown to be the best one. In a few cases, a variation of the essential oil yield with time was observed to be sigmoidal and was modeled by the Boltzmann sigmoid function., Rad se bavi modelovanjem kinetike ekstrakcije etarskog ulja iz biljnih materijala primenom destilacija vodom i vodenom parom. Eksperimentalni podaci dobijeni su proučavanjem kinetike hidrodestilacije etarskog ulja ploda kleke. Literaturni podaci o kinetici hidrodestilacije etarskog ulja iz različitih biljnih materijala su, takođe, uključeni u modelovanje. Za opisivanje kinetike hidrodestilacije etarskog ulja razvijen je fizički model koji je zasnovan na istovremenom ispiranju i difuziji etarskog ulja iz biljnog materijala. Iz ovog modela izvedena su dva prostija modela od kojih je prvi zasnovan na trenutnom ispiranju praćenim difuzijom a drugi na difuziji bez ispiranja (tj.na kinetici prvog reda). Glavni cilj je bio poređenje ovih modela i predlaganje optimalnog za destilacije vodom i vodenom parom I za različite biljne materijale. Sva tri modela opisuju dobro eksperimentalne kinetičke podatke u slučaju destilacije vodom nezavisno od tipa destilatora i njegove veličine, tipa biljnog materijala i procesnih uslova, ali je najbolji model koji uključuje istovremeno ispiranje i difuziju etarskog ulja. Ovaj model je, međutim, neprimenljiv za vodeno-parnu destilaciju etarskog ulja, izuzev za etarsko ulje ploda kleke. Za ovu destilaciju etarskog ulja najbolji je kinetički model pseudo-prvog reda. U slučaju nekoliko biljnih materijala, promena prinosa etarskog ulja sa vremenom je sigmoidna, pa je modelovana Bolcmanovom sigmoidnom funkcijom.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Modeling the kinetics of essential oil hydrodistillation from plant materials, Modelovanje kinetike hidrodestilacije etarskog ulja iz biljnih materijala",
pages = "859-843",
number = "5",
volume = "67",
doi = "10.2298/HEMIND121026009M"
}

Milojević, S., Radosavljević, D. B., Pavićević, V., Pejanović, S.,& Veljković, V. B.. (2013). Modeling the kinetics of essential oil hydrodistillation from plant materials. in Hemijska industrija
Association of Chemical Engineers of Serbia., 67(5), 843-859.
https://doi.org/10.2298/HEMIND121026009M

Milojević S, Radosavljević DB, Pavićević V, Pejanović S, Veljković VB. Modeling the kinetics of essential oil hydrodistillation from plant materials. in Hemijska industrija. 2013;67(5):843-859.
doi:10.2298/HEMIND121026009M .

Milojević, Svetomir, Radosavljević, Dragana B., Pavićević, Vladimir, Pejanović, Srđan, Veljković, Vlada B., "Modeling the kinetics of essential oil hydrodistillation from plant materials" in Hemijska industrija, 67, no. 5 (2013):843-859,
https://doi.org/10.2298/HEMIND121026009M . .

TY  - JOUR
AU  - Milosavljević, Milutin M.
AU  - Marinković, Aleksandar
AU  - Veljković, Vlada B.
AU  - Milenković, Dragan D.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2214
AB  - The kinetics of the syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates from sodium ethyl xanthogenacetate, ten alkylamines, and eight substituted anilines were studied at 25, 30, 35, and 40 A degrees C. The reactions were found to follow second-order kinetics. The kinetic (Arrhenius) parameters, such as the activation energy and the frequency factor, as well as the Eyring parameters, such as the standard entropy, the standard Gibbs energy, and the standard enthalpy of activation, were calculated from the second-order rate constants. The mechanism of the reaction was postulated based on the kinetic studies presented and the optimization of the reaction mechanism using the MOPAC PM6 semi-empirical method.
PB  - Springer Wien, Wien
T2  - Monatshefte Fur Chemie
T1  - Syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates: a kinetic study
EP  - 49
IS  - 1
SP  - 43
VL  - 143
DO  - 10.1007/s00706-011-0596-1
ER  - 

@article{
author = "Milosavljević, Milutin M. and Marinković, Aleksandar and Veljković, Vlada B. and Milenković, Dragan D.",
year = "2012",
abstract = "The kinetics of the syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates from sodium ethyl xanthogenacetate, ten alkylamines, and eight substituted anilines were studied at 25, 30, 35, and 40 A degrees C. The reactions were found to follow second-order kinetics. The kinetic (Arrhenius) parameters, such as the activation energy and the frequency factor, as well as the Eyring parameters, such as the standard entropy, the standard Gibbs energy, and the standard enthalpy of activation, were calculated from the second-order rate constants. The mechanism of the reaction was postulated based on the kinetic studies presented and the optimization of the reaction mechanism using the MOPAC PM6 semi-empirical method.",
publisher = "Springer Wien, Wien",
journal = "Monatshefte Fur Chemie",
title = "Syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates: a kinetic study",
pages = "49-43",
number = "1",
volume = "143",
doi = "10.1007/s00706-011-0596-1"
}

Milosavljević, M. M., Marinković, A., Veljković, V. B.,& Milenković, D. D.. (2012). Syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates: a kinetic study. in Monatshefte Fur Chemie
Springer Wien, Wien., 143(1), 43-49.
https://doi.org/10.1007/s00706-011-0596-1

Milosavljević MM, Marinković A, Veljković VB, Milenković DD. Syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates: a kinetic study. in Monatshefte Fur Chemie. 2012;143(1):43-49.
doi:10.1007/s00706-011-0596-1 .

Milosavljević, Milutin M., Marinković, Aleksandar, Veljković, Vlada B., Milenković, Dragan D., "Syntheses of N-alkyl, N,N-dialkyl, and N-(4-substituted phenyl) O-ethyl thioncarbamates: a kinetic study" in Monatshefte Fur Chemie, 143, no. 1 (2012):43-49,
https://doi.org/10.1007/s00706-011-0596-1 . .

TY  - JOUR
AU  - Stamenković, Olivera S.
AU  - Veljković, Vlada B.
AU  - Todorović, Zoran B.
AU  - Lazić, Miodrag L.
AU  - Banković-Ilić, Ivana B.
AU  - Skala, Dejan U.
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5612
AB  - The kinetics of Ca(OH)2-catalyzed methanolysis of sunflower oil was studied at a moderate temperature (60 °C), a methanol-to-oil molar ratio (6:1) and different catalyst amounts (from 1% to 10% based on oil weight). The methanolysis process was shown to involve the initial triglyceride (TG) mass transfer controlled region, followed by the chemical reaction controlled region in the latter period. The TG mass transfer limitation was caused by the low available active specific catalyst surface due to the high adsorbed methanol concentration. Both the TG mass transfer and chemical reaction rates increased with increasing the catalyst amount.
PB  - Elsevier
T2  - Bioresource Technology
T1  - Modeling the kinetics of calcium hydroxide catalyzed methanolysis of sunflower oil
EP  - 4430
IS  - 12
SP  - 4423
VL  - 101
DO  - 10.1016/j.biortech.2010.01.109
ER  - 

@article{
author = "Stamenković, Olivera S. and Veljković, Vlada B. and Todorović, Zoran B. and Lazić, Miodrag L. and Banković-Ilić, Ivana B. and Skala, Dejan U.",
year = "2010",
abstract = "The kinetics of Ca(OH)2-catalyzed methanolysis of sunflower oil was studied at a moderate temperature (60 °C), a methanol-to-oil molar ratio (6:1) and different catalyst amounts (from 1% to 10% based on oil weight). The methanolysis process was shown to involve the initial triglyceride (TG) mass transfer controlled region, followed by the chemical reaction controlled region in the latter period. The TG mass transfer limitation was caused by the low available active specific catalyst surface due to the high adsorbed methanol concentration. Both the TG mass transfer and chemical reaction rates increased with increasing the catalyst amount.",
publisher = "Elsevier",
journal = "Bioresource Technology",
title = "Modeling the kinetics of calcium hydroxide catalyzed methanolysis of sunflower oil",
pages = "4430-4423",
number = "12",
volume = "101",
doi = "10.1016/j.biortech.2010.01.109"
}

Stamenković, O. S., Veljković, V. B., Todorović, Z. B., Lazić, M. L., Banković-Ilić, I. B.,& Skala, D. U.. (2010). Modeling the kinetics of calcium hydroxide catalyzed methanolysis of sunflower oil. in Bioresource Technology
Elsevier., 101(12), 4423-4430.
https://doi.org/10.1016/j.biortech.2010.01.109

Stamenković OS, Veljković VB, Todorović ZB, Lazić ML, Banković-Ilić IB, Skala DU. Modeling the kinetics of calcium hydroxide catalyzed methanolysis of sunflower oil. in Bioresource Technology. 2010;101(12):4423-4430.
doi:10.1016/j.biortech.2010.01.109 .

Stamenković, Olivera S., Veljković, Vlada B., Todorović, Zoran B., Lazić, Miodrag L., Banković-Ilić, Ivana B., Skala, Dejan U., "Modeling the kinetics of calcium hydroxide catalyzed methanolysis of sunflower oil" in Bioresource Technology, 101, no. 12 (2010):4423-4430,
https://doi.org/10.1016/j.biortech.2010.01.109 . .

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Lukić, Ivana
AU  - Stamenković, Olivera S.
AU  - Veljković, Vlada B.
AU  - Skala, Dejan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1626
AB  - Today, homogeneous base-catalyzed methanolysis is the most frequently used method for industrial biodiesel production. High requirements for the quality of the feedstocks and the problems related to the huge amount of wastewaters have led to the development of novel biodiesel production technologies. Among them, the most important is heterogeneous base-catalyzed methanolysis, which has been intensively investigated over the last decade in order to develop new catalytic systems, optimize the reaction conditions and to recycle catalysts. These studies are a basis for continuous development of biodiesel production on an industrial scale in the near future. The presented work summarize up-to-date studies on biodiesel production by heterogeneous base-catalyzed methanolysis. The main goals were to point out the application of different base compounds as catalysts, the methods of catalyst preparation, impregnation on carriers and recycling as well as the possibilities to improve existing base-catalyzed biodiesel production processes and to develop novel ones.
AB  - Homogena bazno katalizovana metanoliza je najčešće primenjivan postupak dobijanja biodizela u industrijskim uslovima. Visoki zahtevi u pogledu kvaliteta uljnih sirovina i ekološki problemi otpadnih voda doprineli su razvoju novih postupaka sinteze biodizela. Među njima značajno mesto zauzima heterogena bazno katalizovana metanoliza ulja, koja je u poslednjoj deceniji intenzivno proučavana sa aspekta razvoja novih katalitičkih sistema, optimizacije reakcionih uslova metanolize i mogućnosti reciklovanja katalizatora. Ispitivanja ovakvih sistema čine osnovu za razvoj kontinualnih postupaka heterogene bazno katalizovane metanolize, na kojima će se u bliskoj budućnosti bazirati industrijska proizvodnja biodizela. U ovom radu analizirana su dosadašnja ispitivanja postupaka dobijanja biodizela heterogenom bazno katalizovanom metanolizom. Cilj rada je da se ukaže na primenu različitih baznih jedinjenja kao katalizatora, načine njihove pripreme, nanošenja na nosače i recikliranja, kao i na mogućnosti unapređenja postojećih i razvoja novih procesa dobijanja biodizela baznom katalizom.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Heterogeneous base-catalyzed methanolysis of vegetable oils: State of art
T1  - Heterogena bazno katalizovana metanoliza biljnih ulja - presek stanja
EP  - 80
IS  - 2
SP  - 63
VL  - 64
DO  - 10.2298/HEMIND100304012M
ER  - 

@article{
author = "Miladinović, Marija R. and Lukić, Ivana and Stamenković, Olivera S. and Veljković, Vlada B. and Skala, Dejan",
year = "2010",
abstract = "Today, homogeneous base-catalyzed methanolysis is the most frequently used method for industrial biodiesel production. High requirements for the quality of the feedstocks and the problems related to the huge amount of wastewaters have led to the development of novel biodiesel production technologies. Among them, the most important is heterogeneous base-catalyzed methanolysis, which has been intensively investigated over the last decade in order to develop new catalytic systems, optimize the reaction conditions and to recycle catalysts. These studies are a basis for continuous development of biodiesel production on an industrial scale in the near future. The presented work summarize up-to-date studies on biodiesel production by heterogeneous base-catalyzed methanolysis. The main goals were to point out the application of different base compounds as catalysts, the methods of catalyst preparation, impregnation on carriers and recycling as well as the possibilities to improve existing base-catalyzed biodiesel production processes and to develop novel ones., Homogena bazno katalizovana metanoliza je najčešće primenjivan postupak dobijanja biodizela u industrijskim uslovima. Visoki zahtevi u pogledu kvaliteta uljnih sirovina i ekološki problemi otpadnih voda doprineli su razvoju novih postupaka sinteze biodizela. Među njima značajno mesto zauzima heterogena bazno katalizovana metanoliza ulja, koja je u poslednjoj deceniji intenzivno proučavana sa aspekta razvoja novih katalitičkih sistema, optimizacije reakcionih uslova metanolize i mogućnosti reciklovanja katalizatora. Ispitivanja ovakvih sistema čine osnovu za razvoj kontinualnih postupaka heterogene bazno katalizovane metanolize, na kojima će se u bliskoj budućnosti bazirati industrijska proizvodnja biodizela. U ovom radu analizirana su dosadašnja ispitivanja postupaka dobijanja biodizela heterogenom bazno katalizovanom metanolizom. Cilj rada je da se ukaže na primenu različitih baznih jedinjenja kao katalizatora, načine njihove pripreme, nanošenja na nosače i recikliranja, kao i na mogućnosti unapređenja postojećih i razvoja novih procesa dobijanja biodizela baznom katalizom.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Heterogeneous base-catalyzed methanolysis of vegetable oils: State of art, Heterogena bazno katalizovana metanoliza biljnih ulja - presek stanja",
pages = "80-63",
number = "2",
volume = "64",
doi = "10.2298/HEMIND100304012M"
}

Miladinović, M. R., Lukić, I., Stamenković, O. S., Veljković, V. B.,& Skala, D.. (2010). Heterogeneous base-catalyzed methanolysis of vegetable oils: State of art. in Hemijska industrija
Association of Chemical Engineers of Serbia., 64(2), 63-80.
https://doi.org/10.2298/HEMIND100304012M

Miladinović MR, Lukić I, Stamenković OS, Veljković VB, Skala D. Heterogeneous base-catalyzed methanolysis of vegetable oils: State of art. in Hemijska industrija. 2010;64(2):63-80.
doi:10.2298/HEMIND100304012M .

Miladinović, Marija R., Lukić, Ivana, Stamenković, Olivera S., Veljković, Vlada B., Skala, Dejan, "Heterogeneous base-catalyzed methanolysis of vegetable oils: State of art" in Hemijska industrija, 64, no. 2 (2010):63-80,
https://doi.org/10.2298/HEMIND100304012M . .