Separation of methanol + dimethyl carbonate azeotropic mixture using ionic liquids as entrainers

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• 作者：Zhigang Zhang ; Honghong Xu ; Qinqin Zhang ; ^{zhangshoudao@126.com} ; Aidi Zhang ; Yue Li ; Wenxiu Li ; ^{wenxli@126.com}
• 关键词：Vapor-liquid equilibrium ; Ionic liquids ; Methanol ; Dimethyl carbonate ; NRTL model
• 刊名：Fluid Phase Equilibria
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：435
• 期：Complete
• 页码：98-103
• 全文大小：547 K
• 卷排序：435

文摘

Isobaric vapor-liquid equilibrium (VLE) data of methanol + dimethyl carbonate, methanol + dimethyl carbonate + 1-Ethyl-3-Methylimidazolium Bromide ([EMIM][Br]) and methanol + dimethyl carbonate + 1-Butyl-3-Methylimidazolium Chloride ([BMIM][Cl]) were measured by a modified Othmer still at 101.3 kPa. The two investigated ionic liquids produced significant effects on the separation of the methanol and dimethyl carbonate azeotropic system. The relative volatility of dimethyl carbonate to methanol was enhanced with the addition of ionic liquid. The two ionic liquids could both eliminate the azeotropic point as their concentration increased to a certain value, but [BMIM][Cl] showed a greater separation effect on methanol and dimethyl carbonate azeotropic system than [EMIM][Br]. Furthermore, the measured data were well correlated with the nonrandom two-liquid (NRTL) model.