The mixture of dimethyl carbonate (DMC) and ethanol is a common binary azeotrope system in industry that cannot be effectively separated by conventional separation methods. Two ionic liquids (ILs), namely, 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP]) and 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), were tried as novel entrainers for the separation of the DMC–ethanol azeotrope. The vapor–liquid equilibrium (VLE) data of the DMC–ethanol binary system and the DMC–ethanol–ILs ternary system at atmospheric pressure were determined. The results showed that both ILs could increase the relative volatility of DMC to ethanol, thus completely breaking the azeotrope at a certain concentration, and [BMIM][Ac] had more excellent separation capacity than [BMIM][DBP]. The NRTL model and the UNIFAC-Lei model were used to correlate the experimental VLE data, and the fitting results indicated that the NRTL model was in good agreement with the experimental data.

中文翻译：

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基于咪唑鎓离子液体作为夹带剂的碳酸二甲酯和乙醇混合物的分离

碳酸二甲酯（DMC）和乙醇的混合物是工业上常见的二元共沸物系统，无法通过常规分离方法有效分离。尝试了两种离子液体（ILs），即磷酸1-丁基-3-甲基咪唑鎓二丁基磷酸酯（[BMIM] [DBP]）和乙酸1-丁基-3-甲基咪唑鎓乙酸盐（[BMIM] [Ac]）作为新型夹带剂。 DMC-乙醇共沸物的分离。确定了大气压下DMC-乙醇二元系统和DMC-乙醇-ILs三元系统的气液平衡（VLE）数据。结果表明，两种离子液体均可增加DMC与乙醇的相对挥发性，从而在一定浓度下完全破坏共沸物，[BMIM] [Ac]的分离能力比[BMIM] [DBP]更好。