Separation of ethyl acetate and 2-propanol azeotropic mixture using ionic liquids as entrainers

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• 作者：Zhigang Zhang ; Aidi Zhang ; Kaifang Wu ; Qinqin Zhang ; ^{zhangshoudao@126.com" class="auth_mail" title="E-mail the corresponding author} ; Angran Hu ; Wenxiu Li ; ^{wenxli@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ionic liquids ; Vapor-liquid equilibrium ; Ethyl acetate ; 2-propanol ; NRTL model ; σ-Profiles
• 刊名：Fluid Phase Equilibria
• 出版年：2016
• 出版时间：15 December 2016
• 年：2016
• 卷：429
• 期：Complete
• 页码：331-338
• 全文大小：1158 K

文摘

Ionic liquids (ILs) as entrainers for the separation of ethyl acetate and 2-propanol azeotropic mixture were proposed in this work. Through the isobaric vapor-liquid equilibrium (VLE) experiments, we found that the three investigated ILs, namely 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), 1-butyl-3-methylimidazolium bromide ([BMIM][Br]), and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF₄]), could significantly enhance the separation factor of ethyl acetate and 2-propanol, and eliminate the azeotropic point. [BMIM][Ac] produced the most notable salting-out effect on ethyl acetate and 2-propanol among the three investigated ILs. Moreover, the experimental data were well correlated with the non-random two liquid (NRTL) model. Finally, σ-Profiles of solvents and ILs were used to explain the different separate abilities of the three investigated ILs.