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  - Veljković, Vlada B.
AU  - Stamenković, Olivera S.
AU  - Todorović, Zoran B.
AU  - Lazić, Miodrag L.
AU  - Skala, Dejan U.
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5553
AB  - The methanolysis of sunflower oil was studied in the presence of CaO previously calcined at various temperatures and the optimal temperature for CaO calcination was determined. The sigmoidal process kinetics was explained by the initial triglyceride (TG) mass transfer controlled region, followed by the chemical reaction controlled region in the latter reaction period. The TG mass transfer limitation was due to the small available active specific catalyst surface, which was mainly covered by adsorbed molecules of methanol. In the later phase, the adsorbed methanol concentration decreased, causing the increase of both the available active specific catalyst surface and the TG mass transfer rate, and the chemical reaction rate become smaller than the TG mass transfer rate.
PB  - Elsevier
T2  - Fuel
T1  - Kinetics of sunflower oil methanolysis catalyzed by calcium oxide
EP  - 1562
IS  - 9
SP  - 1554
VL  - 88
DO  - 10.1016/j.fuel.2009.02.013
ER  - 

@article{
author = "Veljković, Vlada B. and Stamenković, Olivera S. and Todorović, Zoran B. and Lazić, Miodrag L. and Skala, Dejan U.",
year = "2009",
abstract = "The methanolysis of sunflower oil was studied in the presence of CaO previously calcined at various temperatures and the optimal temperature for CaO calcination was determined. The sigmoidal process kinetics was explained by the initial triglyceride (TG) mass transfer controlled region, followed by the chemical reaction controlled region in the latter reaction period. The TG mass transfer limitation was due to the small available active specific catalyst surface, which was mainly covered by adsorbed molecules of methanol. In the later phase, the adsorbed methanol concentration decreased, causing the increase of both the available active specific catalyst surface and the TG mass transfer rate, and the chemical reaction rate become smaller than the TG mass transfer rate.",
publisher = "Elsevier",
journal = "Fuel",
title = "Kinetics of sunflower oil methanolysis catalyzed by calcium oxide",
pages = "1562-1554",
number = "9",
volume = "88",
doi = "10.1016/j.fuel.2009.02.013"
}

Veljković, V. B., Stamenković, O. S., Todorović, Z. B., Lazić, M. L.,& Skala, D. U.. (2009). Kinetics of sunflower oil methanolysis catalyzed by calcium oxide. in Fuel
Elsevier., 88(9), 1554-1562.
https://doi.org/10.1016/j.fuel.2009.02.013

Veljković VB, Stamenković OS, Todorović ZB, Lazić ML, Skala DU. Kinetics of sunflower oil methanolysis catalyzed by calcium oxide. in Fuel. 2009;88(9):1554-1562.
doi:10.1016/j.fuel.2009.02.013 .

Veljković, Vlada B., Stamenković, Olivera S., Todorović, Zoran B., Lazić, Miodrag L., Skala, Dejan U., "Kinetics of sunflower oil methanolysis catalyzed by calcium oxide" in Fuel, 88, no. 9 (2009):1554-1562,
https://doi.org/10.1016/j.fuel.2009.02.013 . .