کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10271351 | 460764 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vapor-liquid equilibria and densities of CO2 with four unsaturated fatty acid esters at elevated pressures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Vapor-liquid equilibria and densities of CO2 with four unsaturated fatty acid esters at elevated pressures Vapor-liquid equilibria and densities of CO2 with four unsaturated fatty acid esters at elevated pressures](/preview/png/10271351.png)
چکیده انگلیسی
In this study experimental P-T-x-y equilibrium data for four binary mixtures over a wide range of pressure (10.44-23.54 MPa) were determined at 313 K and 333 K. Liquid and vapor densities of carbon dioxide + four fatty acid ester systems, including oleic acid methyl ester, linoleic acid methyl ester, eicosapentaenoic acid ethyl ester, and docosahexaenoic acid ethyl ester were measured by using two circulating systems consisting of two vibrating tube densitometers. The vapor-phase density was observed to increase more significantly with pressure than the liquid-phase density at constant temperature. Experimental equilibrium constants of oleic acid methyl ester and linoleic acid methyl ester were found to be larger than those of eicosapentaenoic acid ethyl ester, docosahaxaenoic acid ethyl ester, linoleic acid, triolein, and tocopherol. This indicates that the two methylated fatty acids would be extracted easier than the other compounds in a separation process using supercritical CO2 extraction. The equilibrium data were successfully correlated using the Peng-Robinson and modified Soave-Redlich-Kwong equations of state with quadratic (two parameters), Panagiotopoulos-Reid (three parameters), and Adachi-Sugie (three parameters) mixing rules. In general, the Soave-Redlich-Kwong equation of state with the Panagiotopoulos-Reid mixing rules and the quadratic mixing rules give the best correlation for methylated fatty acids and ethylated fatty acids, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Phase Equilibria - Volume 233, Issue 1, 15 June 2005, Pages 56-65
Journal: Fluid Phase Equilibria - Volume 233, Issue 1, 15 June 2005, Pages 56-65
نویسندگان
Chieh-ming J. Chang, Ming-shian Lee, Bou-chin Li, Po-yen Chen,