Accurate measurements of thermodynamic properties of solutes in ionic liquids using inverse gas chromatography

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• 作者：Fabrice Mutelet and Jean-Noë ; l Jaubert
• 关键词：Room temperature ionic liquids ; Inverse gas chromatography ; Activity coefficients at infinite dilution ; LSER model
• 刊名：Journal of Chromatography A
• 出版年：2006
• 出版时间：13 January 2006
• 年：2006
• 卷：1102
• 期：1-2
• 页码：256-267
• 全文大小：431 K

文摘

Activity coefficients at infinite dilution of 29 organic compounds in two room temperature ionic liquids were determined using inverse gas chromatography. The measurements were carried out at different temperatures between 323.15 and 343.15 K. To establish the influence of concurrent retention mechanisms on the accuracy of activity coefficients at infinite dilution for 1-butyl-3-methylimidazolium octyl sulfate and 1-ethyl-3-methylimidazolium tosylate, phase loading studies of the net retention volume per gram of packing as a function of the percent phase loading were used. It is shown that most of the solutes are retained largely by partition with a small contribution from adsorption on 1-butyl-3-methylimidazolium octyl sulfate and that the n-alkanes are retained predominantly by interfacial adsorption on 1-ethyl-3-methylimidazolium tosylate.