TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Šućurović, Katarina
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Krstić, Sanja
AU  - Bošković-Vragolović, Nevenka
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6806
AB  - In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds.
AB  - U ovom radu je određivan koeficijent prenosa mase fluid-zid u inverznofluidizovanom sloju primenom adsorpcione metode. Eksperimenti su vršeni u koloni  prečnika 45 mm sa sferičnim i nesferičnim česticama polipropilena i polietilena  prečnika 3.3-4.9 mm i gustine oko 930 kg m-3. Kao fluidizacioni medijum korišćen je  razblaženi rastvor metilenski plavog koji je adsorbovan na delu površine kolone na  silikagelu. Dobijeni rezultati pokazali su da prisustvo čestica pri inverznoj  fluidizaciji ne doprinosi značajno prenosu mase u poređenju sa uticajem čestica na  prenos mase u konvencionalno fluidizovanim slojevima. Zbog toga je u analizu uveden  koncept pseudofluida i izvedena je empirijska korelacija za određivanje koeficijenta  prenosa mase. Izvršeno je poređenje dobijenih rezultata sa literaturnim korelacijama za  inverznu i konvencionalnu fluidizacije.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Mass transfer in inverse fluidized beds
T1  - Prenos mase u inverzno fluidizovanom sloju
EP  - 919
IS  - 9
SP  - 905
VL  - 88
DO  - 10.2298/JSC230116016J
ER  - 

@article{
author = "Jaćimovski, Darko and Šućurović, Katarina and Đuriš, Mihal and Arsenijević, Zorana and Krstić, Sanja and Bošković-Vragolović, Nevenka",
year = "2023",
abstract = "In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds., U ovom radu je određivan koeficijent prenosa mase fluid-zid u inverznofluidizovanom sloju primenom adsorpcione metode. Eksperimenti su vršeni u koloni  prečnika 45 mm sa sferičnim i nesferičnim česticama polipropilena i polietilena  prečnika 3.3-4.9 mm i gustine oko 930 kg m-3. Kao fluidizacioni medijum korišćen je  razblaženi rastvor metilenski plavog koji je adsorbovan na delu površine kolone na  silikagelu. Dobijeni rezultati pokazali su da prisustvo čestica pri inverznoj  fluidizaciji ne doprinosi značajno prenosu mase u poređenju sa uticajem čestica na  prenos mase u konvencionalno fluidizovanim slojevima. Zbog toga je u analizu uveden  koncept pseudofluida i izvedena je empirijska korelacija za određivanje koeficijenta  prenosa mase. Izvršeno je poređenje dobijenih rezultata sa literaturnim korelacijama za  inverznu i konvencionalnu fluidizacije.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Mass transfer in inverse fluidized beds, Prenos mase u inverzno fluidizovanom sloju",
pages = "919-905",
number = "9",
volume = "88",
doi = "10.2298/JSC230116016J"
}

Jaćimovski, D., Šućurović, K., Đuriš, M., Arsenijević, Z., Krstić, S.,& Bošković-Vragolović, N.. (2023). Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 88(9), 905-919.
https://doi.org/10.2298/JSC230116016J

Jaćimovski D, Šućurović K, Đuriš M, Arsenijević Z, Krstić S, Bošković-Vragolović N. Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society. 2023;88(9):905-919.
doi:10.2298/JSC230116016J .

Jaćimovski, Darko, Šućurović, Katarina, Đuriš, Mihal, Arsenijević, Zorana, Krstić, Sanja, Bošković-Vragolović, Nevenka, "Mass transfer in inverse fluidized beds" in Journal of the Serbian Chemical Society, 88, no. 9 (2023):905-919,
https://doi.org/10.2298/JSC230116016J . .

TY  - JOUR
AU  - Duriš, Mihal
AU  - Garić-Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Jaćimovski, Darko
AU  - Grbavčić, Željko
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5728
AB  - Fluidization experiments were conducted on four fractions of filtration (quartz) sand using columns of 144 and 64mm i.d. The size distribution of the fractions obtained by sieving followed an approximately modified normal (Gaussian) particle size distribution with respect to the projected particle diameter, while the shape factor decreased linearly with increasing projected particle diameter. The expansion characteristics of the sand particles followed a Richardson-Zaki relationship. The intercept velocity, i.e., the extrapolated value of the fluid superficial velocity to ε=1 on the plot log (U) vs. log (ε), agreed quite well with the experimentally determined mean free settling velocity of the cloud of about 30 randomly selected particles. During fluidization, the beds were hydraulically separated into 10 sub-fractions, which are then analyzed. For the mixture dp=0.75-1.25mm during fluidization at an overall bed expansion of 35%, the bed partially segregated since, remarkably, the smallest particles were concentrated at the top, while the largest particles were concentrated in the bottom zone. In the remaining part of the bed (about 80% of total mass), the particles were well mixed. Similar experiments were performed with sand mixtures dp=1.60-2.00mm, dp=1.40-2.00mm and dp=1.166-2.00mm. By analyzing the particle size distribution at the bottom and at the top of the bed, it was concluded that the bed was well mixed if the sieving ratio of the largest to smallest sieve opening was less than about 1.5.
PB  - Elsevier
T2  - Powder Technology
T1  - Segregation in water fluidized beds of sand particles
EP  - 179
SP  - 173
VL  - 235
DO  - 10.1016/j.powtec.2012.10.004
ER  - 

@article{
author = "Duriš, Mihal and Garić-Grulović, Radmila and Arsenijević, Zorana and Jaćimovski, Darko and Grbavčić, Željko",
year = "2013",
abstract = "Fluidization experiments were conducted on four fractions of filtration (quartz) sand using columns of 144 and 64mm i.d. The size distribution of the fractions obtained by sieving followed an approximately modified normal (Gaussian) particle size distribution with respect to the projected particle diameter, while the shape factor decreased linearly with increasing projected particle diameter. The expansion characteristics of the sand particles followed a Richardson-Zaki relationship. The intercept velocity, i.e., the extrapolated value of the fluid superficial velocity to ε=1 on the plot log (U) vs. log (ε), agreed quite well with the experimentally determined mean free settling velocity of the cloud of about 30 randomly selected particles. During fluidization, the beds were hydraulically separated into 10 sub-fractions, which are then analyzed. For the mixture dp=0.75-1.25mm during fluidization at an overall bed expansion of 35%, the bed partially segregated since, remarkably, the smallest particles were concentrated at the top, while the largest particles were concentrated in the bottom zone. In the remaining part of the bed (about 80% of total mass), the particles were well mixed. Similar experiments were performed with sand mixtures dp=1.60-2.00mm, dp=1.40-2.00mm and dp=1.166-2.00mm. By analyzing the particle size distribution at the bottom and at the top of the bed, it was concluded that the bed was well mixed if the sieving ratio of the largest to smallest sieve opening was less than about 1.5.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Segregation in water fluidized beds of sand particles",
pages = "179-173",
volume = "235",
doi = "10.1016/j.powtec.2012.10.004"
}

Duriš, M., Garić-Grulović, R., Arsenijević, Z., Jaćimovski, D.,& Grbavčić, Ž.. (2013). Segregation in water fluidized beds of sand particles. in Powder Technology
Elsevier., 235, 173-179.
https://doi.org/10.1016/j.powtec.2012.10.004

Duriš M, Garić-Grulović R, Arsenijević Z, Jaćimovski D, Grbavčić Ž. Segregation in water fluidized beds of sand particles. in Powder Technology. 2013;235:173-179.
doi:10.1016/j.powtec.2012.10.004 .

Duriš, Mihal, Garić-Grulović, Radmila, Arsenijević, Zorana, Jaćimovski, Darko, Grbavčić, Željko, "Segregation in water fluidized beds of sand particles" in Powder Technology, 235 (2013):173-179,
https://doi.org/10.1016/j.powtec.2012.10.004 . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Garić-Grulović, Radmila
AU  - Đuriš, Mihal
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5654
AB  - Ethylene oxide (EtO) is an organic compound, which is used as a starting material in the production of polymers and as sterilizing agent for thermolabile materials. Although ethylene oxide is not common as an organic pollutant, its removal from numerous emission sources (e.g., ethylene oxide production plants or food and pharmaceutical sterilizing units) is of crucial importance because of its mutagenic, teratogenic and cancerogenic effects on human health. The objective of this paper is the experimental investigation of ethylene oxide (EtO) absorption in diluted aqueous solution of sulfuric acid in order to evaluate the applicability of this procedure as well as to obtain project parameters for industrial plant realizetion. It was found that absorption is suitable as the fist step in the purification treatment of high EtO concentrations in the emission gases. According to the literature data, the basic parameter that defines the scrubber efficiency is the contact time, i.e. the ratio of packing height in the scrubber to the velocity of the gas mixture. To investigate the characteristics of wet treatment in a broad range of contact time, parts of the experimental studies were conducted in a system with two and with three scrubbers in series. The obtained experimental results show that the high degree of EtO removal can be achieved (>98%) when the contact time is sufficiently long (about 25s). The process is effective until the concentration of formed glycol in the solution reaches a value of about 20%. The process is safe and there is no danger of ignition and explosion of air and EtO mixture, although at the entrance to the scrubber EtO concentrations are significantly above the lower explosive limit.
AB  - Predmet ovog rada je istraživanje mogućnosti uklanjanja etilen-oksida (EtO) iz otpadnih gasova apsorpcijom u razblaženim vodenim rastvorima sumporne kiseline sa ciljem da se ocene mogućnosti primene ove tehnologije za projektovanje industrijskog sistema. Apsorpcija je naročito pogodan postupak kao prvi stepen prečišćavanja u slučajevima kada je emisiona koncentracija EtO visoka. Eksperimentalno je ispitan uticaj širokog opsega vremena kontakta na efikasnost uklanjanja EtO. Ulazne koncentracije EtO su varirane od 4 do 40 vol.%, a vremena kontakta od 4 do 40 s. Apsorcija je izvođena u rastvoru sumporne kiseline (H2SO4) pri čemu dolazi do hidrolize EtO u etilen-glikol. Efikasnost apsorpcije EtO opada sa povećanjem koncentracije etilen-glikola u apsorpcionom rastvoru. Rezultati eksperimentalnih ispitivanja su pokazali da se može postići visok stepen efikasnosti uklanjanja EtO (> 98%) pod uslovom da je vreme kontakta dovoljno dugo (oko 25s).
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Removal of ethylene oxide from waste gases by absorption
T1  - Uklanjanje etilen-oksida iz otpadnih gasova postupkom apsorpcije
EP  - 395
IS  - 4
SP  - 389
VL  - 65
DO  - 10.2298/HEMIND110329026A
ER  - 

@article{
author = "Arsenijević, Zorana and Grbavčić, Željko and Grbić, Boško and Radić, Nenad and Garić-Grulović, Radmila and Đuriš, Mihal",
year = "2011",
abstract = "Ethylene oxide (EtO) is an organic compound, which is used as a starting material in the production of polymers and as sterilizing agent for thermolabile materials. Although ethylene oxide is not common as an organic pollutant, its removal from numerous emission sources (e.g., ethylene oxide production plants or food and pharmaceutical sterilizing units) is of crucial importance because of its mutagenic, teratogenic and cancerogenic effects on human health. The objective of this paper is the experimental investigation of ethylene oxide (EtO) absorption in diluted aqueous solution of sulfuric acid in order to evaluate the applicability of this procedure as well as to obtain project parameters for industrial plant realizetion. It was found that absorption is suitable as the fist step in the purification treatment of high EtO concentrations in the emission gases. According to the literature data, the basic parameter that defines the scrubber efficiency is the contact time, i.e. the ratio of packing height in the scrubber to the velocity of the gas mixture. To investigate the characteristics of wet treatment in a broad range of contact time, parts of the experimental studies were conducted in a system with two and with three scrubbers in series. The obtained experimental results show that the high degree of EtO removal can be achieved (>98%) when the contact time is sufficiently long (about 25s). The process is effective until the concentration of formed glycol in the solution reaches a value of about 20%. The process is safe and there is no danger of ignition and explosion of air and EtO mixture, although at the entrance to the scrubber EtO concentrations are significantly above the lower explosive limit., Predmet ovog rada je istraživanje mogućnosti uklanjanja etilen-oksida (EtO) iz otpadnih gasova apsorpcijom u razblaženim vodenim rastvorima sumporne kiseline sa ciljem da se ocene mogućnosti primene ove tehnologije za projektovanje industrijskog sistema. Apsorpcija je naročito pogodan postupak kao prvi stepen prečišćavanja u slučajevima kada je emisiona koncentracija EtO visoka. Eksperimentalno je ispitan uticaj širokog opsega vremena kontakta na efikasnost uklanjanja EtO. Ulazne koncentracije EtO su varirane od 4 do 40 vol.%, a vremena kontakta od 4 do 40 s. Apsorcija je izvođena u rastvoru sumporne kiseline (H2SO4) pri čemu dolazi do hidrolize EtO u etilen-glikol. Efikasnost apsorpcije EtO opada sa povećanjem koncentracije etilen-glikola u apsorpcionom rastvoru. Rezultati eksperimentalnih ispitivanja su pokazali da se može postići visok stepen efikasnosti uklanjanja EtO (> 98%) pod uslovom da je vreme kontakta dovoljno dugo (oko 25s).",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Removal of ethylene oxide from waste gases by absorption, Uklanjanje etilen-oksida iz otpadnih gasova postupkom apsorpcije",
pages = "395-389",
number = "4",
volume = "65",
doi = "10.2298/HEMIND110329026A"
}

Arsenijević, Z., Grbavčić, Ž., Grbić, B., Radić, N., Garić-Grulović, R.,& Đuriš, M.. (2011). Removal of ethylene oxide from waste gases by absorption. in Hemijska industrija
Association of Chemical Engineers of Serbia., 65(4), 389-395.
https://doi.org/10.2298/HEMIND110329026A

Arsenijević Z, Grbavčić Ž, Grbić B, Radić N, Garić-Grulović R, Đuriš M. Removal of ethylene oxide from waste gases by absorption. in Hemijska industrija. 2011;65(4):389-395.
doi:10.2298/HEMIND110329026A .

Arsenijević, Zorana, Grbavčić, Željko, Grbić, Boško, Radić, Nenad, Garić-Grulović, Radmila, Đuriš, Mihal, "Removal of ethylene oxide from waste gases by absorption" in Hemijska industrija, 65, no. 4 (2011):389-395,
https://doi.org/10.2298/HEMIND110329026A . .

TY  - JOUR
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Arsenijević, Zorana
AU  - Garić-Grulović, Radmila
AU  - Grbavčić, Željko
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5539
AB  - The deep oxidation of dimethylamine (DMA) was studied over Pt/Al2O3 catalysts with small (1 nm) and large (7.8-15.5 nm) Pt crystallite sizes. The turnover frequency (TOF) was higher for the large than for the small Pt crystallites, indicating that the reaction is structure sensitive. Two kinetic models were used to interpret the obtained results, i.e., the Mars van Krevelen and a mechanism based on the adsorption of oxygen and adsorption of dimethylamine on different active sites were employed. Both models showed that the activation energy for the oxygen chemisorption rate constant (k(o)) decreased with increasing of Pt crystallite size and that the activation energy for the surface reaction rate constant (k(i)) was independent of the Pt crystallite size. The structure sensitivity may be explained by differences in the reactivity of the oxygen adsorbed on these Pt crystallites. The Mars van Krevelen model fits the TOF values very well at concentrations of DMA higher than 1500 ppm, while in the lower concentrations region, the model under predicts the experimental data. The model based on the adsorption of oxygen and DMA on different active sites fits the experimental data quite well over the whole temperature and concentration range. The fitted values of the Henry adsorption constant are independent of the Pt crystallite size.
PB  - Elsevier
T2  - Applied Catalysis B-Environmental
T1  - Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts
EP  - 484
IS  - 3-4
SP  - 478
VL  - 90
DO  - 10.1016/j.apcatb.2009.04.008
ER  - 

@article{
author = "Grbić, Boško and Radić, Nenad and Arsenijević, Zorana and Garić-Grulović, Radmila and Grbavčić, Željko",
year = "2009",
abstract = "The deep oxidation of dimethylamine (DMA) was studied over Pt/Al2O3 catalysts with small (1 nm) and large (7.8-15.5 nm) Pt crystallite sizes. The turnover frequency (TOF) was higher for the large than for the small Pt crystallites, indicating that the reaction is structure sensitive. Two kinetic models were used to interpret the obtained results, i.e., the Mars van Krevelen and a mechanism based on the adsorption of oxygen and adsorption of dimethylamine on different active sites were employed. Both models showed that the activation energy for the oxygen chemisorption rate constant (k(o)) decreased with increasing of Pt crystallite size and that the activation energy for the surface reaction rate constant (k(i)) was independent of the Pt crystallite size. The structure sensitivity may be explained by differences in the reactivity of the oxygen adsorbed on these Pt crystallites. The Mars van Krevelen model fits the TOF values very well at concentrations of DMA higher than 1500 ppm, while in the lower concentrations region, the model under predicts the experimental data. The model based on the adsorption of oxygen and DMA on different active sites fits the experimental data quite well over the whole temperature and concentration range. The fitted values of the Henry adsorption constant are independent of the Pt crystallite size.",
publisher = "Elsevier",
journal = "Applied Catalysis B-Environmental",
title = "Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts",
pages = "484-478",
number = "3-4",
volume = "90",
doi = "10.1016/j.apcatb.2009.04.008"
}

Grbić, B., Radić, N., Arsenijević, Z., Garić-Grulović, R.,& Grbavčić, Ž.. (2009). Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts. in Applied Catalysis B-Environmental
Elsevier., 90(3-4), 478-484.
https://doi.org/10.1016/j.apcatb.2009.04.008

Grbić B, Radić N, Arsenijević Z, Garić-Grulović R, Grbavčić Ž. Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts. in Applied Catalysis B-Environmental. 2009;90(3-4):478-484.
doi:10.1016/j.apcatb.2009.04.008 .

Grbić, Boško, Radić, Nenad, Arsenijević, Zorana, Garić-Grulović, Radmila, Grbavčić, Željko, "Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts" in Applied Catalysis B-Environmental, 90, no. 3-4 (2009):478-484,
https://doi.org/10.1016/j.apcatb.2009.04.008 . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Garić-Grulović, Radmila
AU  - Grbavčić, Željko
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5527
AB  - The dynamics of ethylene oxide sorption and desorption on Al2O3 sorbent were investigated. The investigations of ethylene oxide sorption on Al2O3 show that significant sorption appeared above 125°C. The removal of sorbed ethylene oxide from Al2O3 was achieved by continuous increasing of the temperature up to 450°C in air stream. The analysis of desorbed products show that 90% of adsorbed ethylene oxide is converted to CO2 and the rest consists of the three derivatives of ethylene oxide. The exact composition of desorbed organic products will be determined in further investigation. The desorption temperature profiles point out the presence of two exothermic picks, as was confirmed by detection of CO2 and derivates of ethylene oxide at these temperatures. Investigation of textural characteristics and thermal stability of Al2O3 sorbent show that there are no changes of any characteristics of Al2O3 in sorption/desorption operating temperatures regimes. Only at 700°C the specific surface area of Al2O3 decreases of about 10%. This indicates that the investigated Al2O3 is convenient material for removal of ethylene oxide by sorption.
AB  - U ovom radu prikazana su ispitivanja dinamike sorpcije i desorpcije etilen oksida na Al2O3 kao i sorpcioni kapaciteti, temperaturni režimi desorpcije i sastav produkata desorpcije etilen oksida. Rezultati su ukazali da sferni Al2O3 sorbent poseduje zadovoljavajuće sorpcione karakteristike za uklanjanje etilen oksida. Na temperaturama iznad 125°C ne dolazi do značajnog povećanja kapaciteta sorpcije etilen oksida. Produkti desorpcije etilen oksida sa Al2O3 sorbenta, postepenim povećanjem temperature u vazduhu, sadrže oko 90% CO2, a ostatak čine derivati etilen oksida. Ispitivanja teksturalnih karakteristika i termičke stabilnosti Al2O3 sorbenta pokazala su da u sorpciono/desorpcionom operativnom režimu nema nikakvih teksturalnih promena sorbenta. Ovo ukazuje da je ispitivana alumina pogodan materijal za sorpciono uklanjanje etilen oksida.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Ethylene oxide removal by sorption on aluminium oxide
T1  - Uklanjanje etilen oksida sorpcijom na aluminijum oksidu
EP  - 343
IS  - 4
SP  - 337
VL  - 63
DO  - 10.2298/HEMIND0904337A
ER  - 

@article{
author = "Arsenijević, Zorana and Grbić, Boško and Radić, Nenad and Garić-Grulović, Radmila and Grbavčić, Željko",
year = "2009",
abstract = "The dynamics of ethylene oxide sorption and desorption on Al2O3 sorbent were investigated. The investigations of ethylene oxide sorption on Al2O3 show that significant sorption appeared above 125°C. The removal of sorbed ethylene oxide from Al2O3 was achieved by continuous increasing of the temperature up to 450°C in air stream. The analysis of desorbed products show that 90% of adsorbed ethylene oxide is converted to CO2 and the rest consists of the three derivatives of ethylene oxide. The exact composition of desorbed organic products will be determined in further investigation. The desorption temperature profiles point out the presence of two exothermic picks, as was confirmed by detection of CO2 and derivates of ethylene oxide at these temperatures. Investigation of textural characteristics and thermal stability of Al2O3 sorbent show that there are no changes of any characteristics of Al2O3 in sorption/desorption operating temperatures regimes. Only at 700°C the specific surface area of Al2O3 decreases of about 10%. This indicates that the investigated Al2O3 is convenient material for removal of ethylene oxide by sorption., U ovom radu prikazana su ispitivanja dinamike sorpcije i desorpcije etilen oksida na Al2O3 kao i sorpcioni kapaciteti, temperaturni režimi desorpcije i sastav produkata desorpcije etilen oksida. Rezultati su ukazali da sferni Al2O3 sorbent poseduje zadovoljavajuće sorpcione karakteristike za uklanjanje etilen oksida. Na temperaturama iznad 125°C ne dolazi do značajnog povećanja kapaciteta sorpcije etilen oksida. Produkti desorpcije etilen oksida sa Al2O3 sorbenta, postepenim povećanjem temperature u vazduhu, sadrže oko 90% CO2, a ostatak čine derivati etilen oksida. Ispitivanja teksturalnih karakteristika i termičke stabilnosti Al2O3 sorbenta pokazala su da u sorpciono/desorpcionom operativnom režimu nema nikakvih teksturalnih promena sorbenta. Ovo ukazuje da je ispitivana alumina pogodan materijal za sorpciono uklanjanje etilen oksida.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Ethylene oxide removal by sorption on aluminium oxide, Uklanjanje etilen oksida sorpcijom na aluminijum oksidu",
pages = "343-337",
number = "4",
volume = "63",
doi = "10.2298/HEMIND0904337A"
}

Arsenijević, Z., Grbić, B., Radić, N., Garić-Grulović, R.,& Grbavčić, Ž.. (2009). Ethylene oxide removal by sorption on aluminium oxide. in Hemijska industrija
Association of Chemical Engineers of Serbia., 63(4), 337-343.
https://doi.org/10.2298/HEMIND0904337A

Arsenijević Z, Grbić B, Radić N, Garić-Grulović R, Grbavčić Ž. Ethylene oxide removal by sorption on aluminium oxide. in Hemijska industrija. 2009;63(4):337-343.
doi:10.2298/HEMIND0904337A .

Arsenijević, Zorana, Grbić, Boško, Radić, Nenad, Garić-Grulović, Radmila, Grbavčić, Željko, "Ethylene oxide removal by sorption on aluminium oxide" in Hemijska industrija, 63, no. 4 (2009):337-343,
https://doi.org/10.2298/HEMIND0904337A . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbić, Boško
AU  - Grbavčić, Željko
AU  - Miletić, Saša
AU  - Savčić, Gordan
AU  - Radić, Nenad
AU  - Garić-Grulović, Radmila
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5577
AB  - The widely used herbicide, dimethylamine salt of 2,4-dichlorophenoxy acetic acid (2,4-D-DMA), is usually prepared by mixing a dimethylamine (DMA) aqueous solution with a solid 2,4-dichlorophenoxy acetic acid (2,4-D). The vapors of the both, reactants and products, are potentially hazardous for the environment. The contribution of DMA vapors in overall pollution from this process is most significant, concerning vapor pressures data of these pollutants. Therefore, the control of the air pollution in the manufacture and handling of methylamines is very important. Within this paper, the optimal air pollution control system in preparation of 2,4-D-DMA was developed for the pesticides manufacturing industry. This study employed the simple pollution prevention concept to reduce the emission of DMA vapors at the source. The investigations were performed on the pilot plant scale. To reduce the emission of DMA vapors, the effluent gases from the herbicide preparation zone were passed through the packed bed scrubber (water scrubbing medium), and the catalytic reactor in sequence. The end result is a substantially improved air quality in the working area, as well as in the urbanized areas located near the chemical plant.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Prevention and control of dimethylamine vapors emission: Herbicide production plant
EP  - 243
IS  - 4
SP  - 239
VL  - 14
DO  - 10.2298/CICEQ0804239A
ER  - 

@article{
author = "Arsenijević, Zorana and Grbić, Boško and Grbavčić, Željko and Miletić, Saša and Savčić, Gordan and Radić, Nenad and Garić-Grulović, Radmila",
year = "2008",
abstract = "The widely used herbicide, dimethylamine salt of 2,4-dichlorophenoxy acetic acid (2,4-D-DMA), is usually prepared by mixing a dimethylamine (DMA) aqueous solution with a solid 2,4-dichlorophenoxy acetic acid (2,4-D). The vapors of the both, reactants and products, are potentially hazardous for the environment. The contribution of DMA vapors in overall pollution from this process is most significant, concerning vapor pressures data of these pollutants. Therefore, the control of the air pollution in the manufacture and handling of methylamines is very important. Within this paper, the optimal air pollution control system in preparation of 2,4-D-DMA was developed for the pesticides manufacturing industry. This study employed the simple pollution prevention concept to reduce the emission of DMA vapors at the source. The investigations were performed on the pilot plant scale. To reduce the emission of DMA vapors, the effluent gases from the herbicide preparation zone were passed through the packed bed scrubber (water scrubbing medium), and the catalytic reactor in sequence. The end result is a substantially improved air quality in the working area, as well as in the urbanized areas located near the chemical plant.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Prevention and control of dimethylamine vapors emission: Herbicide production plant",
pages = "243-239",
number = "4",
volume = "14",
doi = "10.2298/CICEQ0804239A"
}

Arsenijević, Z., Grbić, B., Grbavčić, Ž., Miletić, S., Savčić, G., Radić, N.,& Garić-Grulović, R.. (2008). Prevention and control of dimethylamine vapors emission: Herbicide production plant. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 14(4), 239-243.
https://doi.org/10.2298/CICEQ0804239A

Arsenijević Z, Grbić B, Grbavčić Ž, Miletić S, Savčić G, Radić N, Garić-Grulović R. Prevention and control of dimethylamine vapors emission: Herbicide production plant. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2008;14(4):239-243.
doi:10.2298/CICEQ0804239A .

Arsenijević, Zorana, Grbić, Boško, Grbavčić, Željko, Miletić, Saša, Savčić, Gordan, Radić, Nenad, Garić-Grulović, Radmila, "Prevention and control of dimethylamine vapors emission: Herbicide production plant" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 14, no. 4 (2008):239-243,
https://doi.org/10.2298/CICEQ0804239A . .

TY  - JOUR
AU  - Rankovic, D.
AU  - Arsenijević, Zorana
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Grbavčić, Željko
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5496
AB  - The thermal desorption of saturated activated carbon discharged from an industrial adsorber and catalytic oxidation of desorbed products over a Pt/Al2O3 catalyst were investigated. The activated carbon is almost completely regenerated by flushing with air at 200 degrees C for 30 min. Desorbed products are fully oxidized over the Pt/Al2O3 catalyst above 275 degrees C.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Russian Journal of Physical Chemistry A
T1  - Removal of volatile organic compounds from activated carbon by thermal Desorption and catalytic combustion
EP  - 1391
IS  - 9
SP  - 1388
VL  - 81
DO  - 10.1134/S0036024407090075
ER  - 

@article{
author = "Rankovic, D. and Arsenijević, Zorana and Radić, Nenad and Grbić, Boško and Grbavčić, Željko",
year = "2007",
abstract = "The thermal desorption of saturated activated carbon discharged from an industrial adsorber and catalytic oxidation of desorbed products over a Pt/Al2O3 catalyst were investigated. The activated carbon is almost completely regenerated by flushing with air at 200 degrees C for 30 min. Desorbed products are fully oxidized over the Pt/Al2O3 catalyst above 275 degrees C.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Russian Journal of Physical Chemistry A",
title = "Removal of volatile organic compounds from activated carbon by thermal Desorption and catalytic combustion",
pages = "1391-1388",
number = "9",
volume = "81",
doi = "10.1134/S0036024407090075"
}

Rankovic, D., Arsenijević, Z., Radić, N., Grbić, B.,& Grbavčić, Ž.. (2007). Removal of volatile organic compounds from activated carbon by thermal Desorption and catalytic combustion. in Russian Journal of Physical Chemistry A
Maik Nauka/Interperiodica/Springer, New York., 81(9), 1388-1391.
https://doi.org/10.1134/S0036024407090075

Rankovic D, Arsenijević Z, Radić N, Grbić B, Grbavčić Ž. Removal of volatile organic compounds from activated carbon by thermal Desorption and catalytic combustion. in Russian Journal of Physical Chemistry A. 2007;81(9):1388-1391.
doi:10.1134/S0036024407090075 .

Rankovic, D., Arsenijević, Zorana, Radić, Nenad, Grbić, Boško, Grbavčić, Željko, "Removal of volatile organic compounds from activated carbon by thermal Desorption and catalytic combustion" in Russian Journal of Physical Chemistry A, 81, no. 9 (2007):1388-1391,
https://doi.org/10.1134/S0036024407090075 . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
AU  - Garić-Grulović, Radmila
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5450
AB  - A model for predicting the particle circulation rate in a draft tube spouted bed dryer with inert particles is proposed and verified. The calculation algorithm requires three input values: the gas velocity in the draft tube one data point for the static pressure in the draft tube, and the pressure gradient in the annulus. The particle circulation rate can be estimated by solving the continuity and momentum equations for turbulent accelerating two-phase flow. The numerical solution is based on an iterative procedure until the assumed value of the particle circulation rate produces the prescribed value of the fluid static pressure at a certain axial position. Experiments were performed in a cylindrical column of 215 mm diameter with a draft tube of 70 mm diameter and length of 900 mm. Polyetylene pellets were used as the inert particles with a diameter of 3.3 mm, a density of 921 kg/m3 and a sphericity of 0.873. The model predictions of the particle circulation rate are in good agreement with the experimental data.
AB  - Postavljen je model za predviđanje brzine cirkulacije čestica u sušioniku sa fontanskim slojem inertnih čestica i centralnom cevi. Predloženi model je eksperimentalno verifikovan. U algoritmu proračuna egzistiraju tri veličine kao poznate (ulazni parametri): brzina gasa kroz centralnu cev, jedna vrednost statičkog pritiska u centralnoj cevi i gradijent pritiska u anularnoj zoni. Brzina cirkulacije čestica se izračunava iz jednačina kontinuiteta i bilansa količine kretanja za turbulentni dvofazni tok fluid-čestice.Numeričko rešavanje se zasniva na metodi probe i greške iterativnim postupkom, sve dok se na osnovu predpostavljene vrednosti brzine čestica ne dobije vrednost statičkog pritiska fluida koja je jednaka izmerenoj vrednosti na određenoj aksijalnoj poziciji u centralnoj cevi. Eksperimentalna ispitivanja su izvedena u koloni prečnika 215 mm sa centralnom cevi prečnika 70mm i dužine 900 mm. Fontanski sloj je obrazovan od nesferičnih polipropilenskih čestica ekvivalentnog prečnika 3,3mm sferičnosti 0,873 i gustine 921 kg/m3. Dobijeni rezultati za brzinu čestica u centralnoj cevi su u dobroj saglasnosti sa eksperimentalnim podacima.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Prediction of the particle circulation rate in a draft tube spouted bed suspension dryer
T1  - Predviđanje cirkulacije čestica u sušioniku za suspenzije sa modifikovanim fontanskim slojem
EP  - 412
IS  - 4
SP  - 401
VL  - 71
DO  - 10.2298/JSC0604401A
ER  - 

@article{
author = "Arsenijević, Zorana and Grbavčić, Željko and Garić-Grulović, Radmila",
year = "2006",
abstract = "A model for predicting the particle circulation rate in a draft tube spouted bed dryer with inert particles is proposed and verified. The calculation algorithm requires three input values: the gas velocity in the draft tube one data point for the static pressure in the draft tube, and the pressure gradient in the annulus. The particle circulation rate can be estimated by solving the continuity and momentum equations for turbulent accelerating two-phase flow. The numerical solution is based on an iterative procedure until the assumed value of the particle circulation rate produces the prescribed value of the fluid static pressure at a certain axial position. Experiments were performed in a cylindrical column of 215 mm diameter with a draft tube of 70 mm diameter and length of 900 mm. Polyetylene pellets were used as the inert particles with a diameter of 3.3 mm, a density of 921 kg/m3 and a sphericity of 0.873. The model predictions of the particle circulation rate are in good agreement with the experimental data., Postavljen je model za predviđanje brzine cirkulacije čestica u sušioniku sa fontanskim slojem inertnih čestica i centralnom cevi. Predloženi model je eksperimentalno verifikovan. U algoritmu proračuna egzistiraju tri veličine kao poznate (ulazni parametri): brzina gasa kroz centralnu cev, jedna vrednost statičkog pritiska u centralnoj cevi i gradijent pritiska u anularnoj zoni. Brzina cirkulacije čestica se izračunava iz jednačina kontinuiteta i bilansa količine kretanja za turbulentni dvofazni tok fluid-čestice.Numeričko rešavanje se zasniva na metodi probe i greške iterativnim postupkom, sve dok se na osnovu predpostavljene vrednosti brzine čestica ne dobije vrednost statičkog pritiska fluida koja je jednaka izmerenoj vrednosti na određenoj aksijalnoj poziciji u centralnoj cevi. Eksperimentalna ispitivanja su izvedena u koloni prečnika 215 mm sa centralnom cevi prečnika 70mm i dužine 900 mm. Fontanski sloj je obrazovan od nesferičnih polipropilenskih čestica ekvivalentnog prečnika 3,3mm sferičnosti 0,873 i gustine 921 kg/m3. Dobijeni rezultati za brzinu čestica u centralnoj cevi su u dobroj saglasnosti sa eksperimentalnim podacima.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Prediction of the particle circulation rate in a draft tube spouted bed suspension dryer, Predviđanje cirkulacije čestica u sušioniku za suspenzije sa modifikovanim fontanskim slojem",
pages = "412-401",
number = "4",
volume = "71",
doi = "10.2298/JSC0604401A"
}

Arsenijević, Z., Grbavčić, Ž.,& Garić-Grulović, R.. (2006). Prediction of the particle circulation rate in a draft tube spouted bed suspension dryer. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 71(4), 401-412.
https://doi.org/10.2298/JSC0604401A

Arsenijević Z, Grbavčić Ž, Garić-Grulović R. Prediction of the particle circulation rate in a draft tube spouted bed suspension dryer. in Journal of the Serbian Chemical Society. 2006;71(4):401-412.
doi:10.2298/JSC0604401A .

Arsenijević, Zorana, Grbavčić, Željko, Garić-Grulović, Radmila, "Prediction of the particle circulation rate in a draft tube spouted bed suspension dryer" in Journal of the Serbian Chemical Society, 71, no. 4 (2006):401-412,
https://doi.org/10.2298/JSC0604401A . .