Adsorption Equilibria of cis-5,8,11,14,17-Eicosapentaenoic Acid Ethyl Ester and cis-4,7,10,13,16,19-Docosahexaenoic Acid Ethyl Ester from Supercritical Carbon Dioxide on Silica Gel
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- 作者：Yisong Han ; Yiwen Yang ; Pingdong Wu
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2008
- 出版时间：January 2008
- 年：2008
- 卷：53
- 期：1
- 页码：16 - 19
- 全文大小：266K
- 年卷期：v.53,no.1(January 2008)
- ISSN：1520-5134
文摘
Adsorption data of cis-5,8,11,14,17-eicosapentaenoic acid ethyl ester (EPA-EE) and cis-4,7,10,13,16,19-docosahexaenoic acid ethyl ester (DHA-EE) from supercritical carbon dioxide on silica gel were determined at temperatures from (319.15 to 340.35) K and carbon dioxide densities from (0.668 to 0.734) g·mL−1 by using the elution by characteristic point (ECP) method. The equilibrium isotherm data were fitted using a Langmuir model. The monolayer adsorption capacity of EPA-EE is 0.130 mmol·g−1, and that of DHA-EE is 0.119 mmol·g−1. The adsorption enthalpy change of EPA-EE is in the range of (34.4 to 38.0) kJ·mol−1, and that of DHA-EE is in the range of (34.4 to 40.6) kJ·mol−1.