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  - 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  - 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  - 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  - 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  - 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 . .

TY  - JOUR
AU  - Stamenković, Ivica S.
AU  - Stamenković, Olivera S.
AU  - Banković-Ilić, Ivana B.
AU  - Lazić, Miodrag L.
AU  - Veljković, Vlada B.
AU  - Skala, Dejan U.
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5506
AB  - Gas holdup was investigated in a gas-liquid and gas-liquid-solid reciprocating plate column (RPC) under various operation conditions. Aqueous carboxymethylcellulose (sodium salt, CMC) solutions were used as the liquid phase, the solid phase was spheres placed into interplate spaces, and the gas plase was air. The gas holdup in the RPC was influenced by: the vibration intensity, i.e., the power consumption, the superficial gas velocity, the solids content and the rheological properties of the liquid phase. The gas holdup increased with increasing vibration intensity and superficial gas velocity in both the two- and three-phase system. With increasing concentration of the CMC PP 50 solution (Newtonian fluid), the gas holdup decreased, because the coalescence of the bubbles was favored by the higher liquid viscosity. In the case of the CMC PP 200 solutions (non-Newtonian liquids), the gas holdup depends on the combined influence of the rheological properties of the liquid phase, the vibration intensity and the superficial gas velocity. The gas holdup in the three-phase systems was greater than that in the two-phase ones under the same operating conditions. Increasing the solids content has little influence on the gas holdup. The gas holdup was correlated with the power consumption (either the time-averaged or total power consuption) and the superficial gas velocity.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - The gas holdup in a multiphase reciprocating plate column filled with carboxymethylcellulose solutions
T1  - Утицај концентрације раствора и степена полимеризације карбоксиметилцелулозе на садржај гаса у реактору са вибрационом мешалицом
EP  - 1544
IS  - 12
SP  - 1533
VL  - 70
DO  - 10.2298/JSC0512533S
ER  - 

@article{
author = "Stamenković, Ivica S. and Stamenković, Olivera S. and Banković-Ilić, Ivana B. and Lazić, Miodrag L. and Veljković, Vlada B. and Skala, Dejan U.",
year = "2005",
abstract = "Gas holdup was investigated in a gas-liquid and gas-liquid-solid reciprocating plate column (RPC) under various operation conditions. Aqueous carboxymethylcellulose (sodium salt, CMC) solutions were used as the liquid phase, the solid phase was spheres placed into interplate spaces, and the gas plase was air. The gas holdup in the RPC was influenced by: the vibration intensity, i.e., the power consumption, the superficial gas velocity, the solids content and the rheological properties of the liquid phase. The gas holdup increased with increasing vibration intensity and superficial gas velocity in both the two- and three-phase system. With increasing concentration of the CMC PP 50 solution (Newtonian fluid), the gas holdup decreased, because the coalescence of the bubbles was favored by the higher liquid viscosity. In the case of the CMC PP 200 solutions (non-Newtonian liquids), the gas holdup depends on the combined influence of the rheological properties of the liquid phase, the vibration intensity and the superficial gas velocity. The gas holdup in the three-phase systems was greater than that in the two-phase ones under the same operating conditions. Increasing the solids content has little influence on the gas holdup. The gas holdup was correlated with the power consumption (either the time-averaged or total power consuption) and the superficial gas velocity.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The gas holdup in a multiphase reciprocating plate column filled with carboxymethylcellulose solutions, Утицај концентрације раствора и степена полимеризације карбоксиметилцелулозе на садржај гаса у реактору са вибрационом мешалицом",
pages = "1544-1533",
number = "12",
volume = "70",
doi = "10.2298/JSC0512533S"
}

Stamenković, I. S., Stamenković, O. S., Banković-Ilić, I. B., Lazić, M. L., Veljković, V. B.,& Skala, D. U.. (2005). The gas holdup in a multiphase reciprocating plate column filled with carboxymethylcellulose solutions. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 70(12), 1533-1544.
https://doi.org/10.2298/JSC0512533S

Stamenković IS, Stamenković OS, Banković-Ilić IB, Lazić ML, Veljković VB, Skala DU. The gas holdup in a multiphase reciprocating plate column filled with carboxymethylcellulose solutions. in Journal of the Serbian Chemical Society. 2005;70(12):1533-1544.
doi:10.2298/JSC0512533S .

Stamenković, Ivica S., Stamenković, Olivera S., Banković-Ilić, Ivana B., Lazić, Miodrag L., Veljković, Vlada B., Skala, Dejan U., "The gas holdup in a multiphase reciprocating plate column filled with carboxymethylcellulose solutions" in Journal of the Serbian Chemical Society, 70, no. 12 (2005):1533-1544,
https://doi.org/10.2298/JSC0512533S . .