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Phase transition at subcritical and supercritical conditions of triglycerides methanolysis

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Authors
Glišić, Sandra
Skala, Dejan
Article (Published version)
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Abstract
The analysis of phase equilibrium between methanol and glycerides during methyl esters of fatty acids (FAME or biodiesel) synthesis at high pressure and temperature is very important for describing the kinetic and process design. It was studied at pressure between 1.1 and 28.0 MPa and temperature from 150 to 270 degrees C. The transition of phases and composition of identified phases was calculated using RK-Aspen EOS and obtained values were also compared to experimentally determined data at subcritical condition (1.1-4.5 MPa and 150-210 degrees C). Results of experimental investigation, as well as performed simulation of some specified composition of reaction mixture, showed that system of triglycerides and methanol, at the beginning of reaction (at all analysed conditions except for supercritical state of mixture) is in equilibrium between two liquid phases. During the methanolysis of triglycerides, the phase's distribution was changed accordingly and it highly depends on actual comp...osition of reaction mixture, temperature and pressure. Calculated and measured values indicated that distribution of methanol between the oil phase, the methyl esters, and the glycerol rich phase exists and depends of working condition. As a consequence of fact, that the methanolysis of triglycerides (oil) is mainly realized in the oil-rich phase, at the end of reaction, after all triglycerides are converted into FAME and glycerol, the oil phase disappears. Furthermore, according to the results of phase composition calculation, it was shown that from the beginning to the end of reaction one phase only exists, for methanolysis performed at 270 degrees C and 20.0 MPa.

Keywords:
Triglycerides' methanolysis / Phase transition / Subcritical / Supercritical
Source:
Journal of Supercritical Fluids, 2010, 54, 1, 71-80
Publisher:
  • Elsevier, Amsterdam
Funding / projects:
  • Izolovanje, karakterizacija, biološka aktivnost i transformacija prirodnih jedinjenja i sinteza katalizatora primenom natkritičnih fluida, mikrotalasa i ultrazvuka (RS-142073)
  • Razvoj kontinualnih postupaka alkoholize biljnih ulja na niskoj, umerenoj i povišenoj temperaturi (RS-19062)

DOI: 10.1016/j.supflu.2010.03.005

ISSN: 0896-8446

WoS: 000279364700010

Scopus: 2-s2.0-77955414706
[ Google Scholar ]
48
45
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1592
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Glišić, Sandra
AU  - Skala, Dejan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1592
AB  - The analysis of phase equilibrium between methanol and glycerides during methyl esters of fatty acids (FAME or biodiesel) synthesis at high pressure and temperature is very important for describing the kinetic and process design. It was studied at pressure between 1.1 and 28.0 MPa and temperature from 150 to 270 degrees C. The transition of phases and composition of identified phases was calculated using RK-Aspen EOS and obtained values were also compared to experimentally determined data at subcritical condition (1.1-4.5 MPa and 150-210 degrees C). Results of experimental investigation, as well as performed simulation of some specified composition of reaction mixture, showed that system of triglycerides and methanol, at the beginning of reaction (at all analysed conditions except for supercritical state of mixture) is in equilibrium between two liquid phases. During the methanolysis of triglycerides, the phase's distribution was changed accordingly and it highly depends on actual composition of reaction mixture, temperature and pressure. Calculated and measured values indicated that distribution of methanol between the oil phase, the methyl esters, and the glycerol rich phase exists and depends of working condition. As a consequence of fact, that the methanolysis of triglycerides (oil) is mainly realized in the oil-rich phase, at the end of reaction, after all triglycerides are converted into FAME and glycerol, the oil phase disappears. Furthermore, according to the results of phase composition calculation, it was shown that from the beginning to the end of reaction one phase only exists, for methanolysis performed at 270 degrees C and 20.0 MPa.
PB  - Elsevier, Amsterdam
T2  - Journal of Supercritical Fluids
T1  - Phase transition at subcritical and supercritical conditions of triglycerides methanolysis
EP  - 80
IS  - 1
SP  - 71
VL  - 54
DO  - 10.1016/j.supflu.2010.03.005
UR  - conv_3417
ER  - 
@article{
author = "Glišić, Sandra and Skala, Dejan",
year = "2010",
abstract = "The analysis of phase equilibrium between methanol and glycerides during methyl esters of fatty acids (FAME or biodiesel) synthesis at high pressure and temperature is very important for describing the kinetic and process design. It was studied at pressure between 1.1 and 28.0 MPa and temperature from 150 to 270 degrees C. The transition of phases and composition of identified phases was calculated using RK-Aspen EOS and obtained values were also compared to experimentally determined data at subcritical condition (1.1-4.5 MPa and 150-210 degrees C). Results of experimental investigation, as well as performed simulation of some specified composition of reaction mixture, showed that system of triglycerides and methanol, at the beginning of reaction (at all analysed conditions except for supercritical state of mixture) is in equilibrium between two liquid phases. During the methanolysis of triglycerides, the phase's distribution was changed accordingly and it highly depends on actual composition of reaction mixture, temperature and pressure. Calculated and measured values indicated that distribution of methanol between the oil phase, the methyl esters, and the glycerol rich phase exists and depends of working condition. As a consequence of fact, that the methanolysis of triglycerides (oil) is mainly realized in the oil-rich phase, at the end of reaction, after all triglycerides are converted into FAME and glycerol, the oil phase disappears. Furthermore, according to the results of phase composition calculation, it was shown that from the beginning to the end of reaction one phase only exists, for methanolysis performed at 270 degrees C and 20.0 MPa.",
publisher = "Elsevier, Amsterdam",
journal = "Journal of Supercritical Fluids",
title = "Phase transition at subcritical and supercritical conditions of triglycerides methanolysis",
pages = "80-71",
number = "1",
volume = "54",
doi = "10.1016/j.supflu.2010.03.005",
url = "conv_3417"
}
Glišić, S.,& Skala, D.. (2010). Phase transition at subcritical and supercritical conditions of triglycerides methanolysis. in Journal of Supercritical Fluids
Elsevier, Amsterdam., 54(1), 71-80.
https://doi.org/10.1016/j.supflu.2010.03.005
conv_3417
Glišić S, Skala D. Phase transition at subcritical and supercritical conditions of triglycerides methanolysis. in Journal of Supercritical Fluids. 2010;54(1):71-80.
doi:10.1016/j.supflu.2010.03.005
conv_3417 .
Glišić, Sandra, Skala, Dejan, "Phase transition at subcritical and supercritical conditions of triglycerides methanolysis" in Journal of Supercritical Fluids, 54, no. 1 (2010):71-80,
https://doi.org/10.1016/j.supflu.2010.03.005 .,
conv_3417 .

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