Effect of Ionic Liquids on the Isobaric Vapor鈥揕iquid Equilibrium Behavior of Methanol鈥揗ethyl Ethyl Ketone

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• 作者：Qunsheng Li ; Xueting Sun ; Ling Cao ; Baohua Wang ; Zhaowen Chen ; Yuxin Zhang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：May 9, 2013
• 年：2013
• 卷：58
• 期：5
• 页码：1133-1140
• 全文大小：420K
• 年卷期：v.58,no.5(May 9, 2013)
• ISSN：1520-5134

文摘

Isobaric vapor鈥搇iquid equilibrium (VLE) data for methanol鈥搈ethyl ethyl ketone (MEK) systems containing ionic liquids (ILs) have been measured with a modified Othmer still at atmospheric pressure (101.32 kPa), and they were correlated by the NRTL equation. Three ILs, composed of an anion tetrafluoroborate ([BF4]^{鈭?/sup>) and a cation from 1-ethyl-3-methylimidazolium ([EMIM]+), over 1-butyl-3-methylimidazolium ([BMIM]+), to 1-octyl-3-methylimidazolium ([OMIM]+), were investigated, and they all gave rise to a change of the relative volatility of methanol to MEK. The results indicated that, among the three ILs studied, [BMIM]+[BF₄]鈭?/sup> and [OMIM]+[BF₄]鈭?/sup> eliminated the azeotropic point at mole fraction 30 % and 10 %, respectively, whereas IL [EMIM]+[BF₄]鈭?/sup> pulled down the azeotropic point. The influence of the variation of the cation鈥檚 alkyl chain length of imidazolium tetrafluoroborate-based ILs on VLE of the azeotropic system methanol鈥揗EK was discussed.}