The double salt ionic liquid (DSIL) [EMIM][Cl]_0.5[DCA]_0.5, which was made by mixing 1-ethyl-3-methylimidazolium chloride ([EMIM][Cl]) and 1-ethyl-3-methylimidazolium dicyanamide ([EMIM][DCA]), was used for the separation of the methyl acetate + methanol azeotropic mixture. Isobaric vapor−liquid equilibrium (VLE) data for the ternary system of methyl acetate (1) + methanol (2) + [EMIM][Cl]_0.5[DCA]_0.5 (3) were measured at 101.3 kPa. The DSIL [EMIM][Cl]_0.5[DCA]_0.5 produced significant salting-out effect to methyl acetate and was able to break the azeotropic point of methyl acetate + methanol at low concentration of DSIL. The Non-Random Two-Liquid (NRTL) activity coefficient model was adopted to correlate the vapor−liquid equilibrium (VLE) data using three different objective functions, and the parameters of NRTL model were obtained based on the best objective function. Isobaric vapor−liquid equilibrium (VLE) data for the ternary systems of methyl acetate (1) + methanol (2) + [EMIM][Cl] (3) and methyl acetate (1) + methanol (2) + [EMIM][DCA] (3) were also measured at 101.3 kPa. The separation effects of DSIL [EMIM][Cl]_0.5[DCA]_0.5 were compared with the single ionic liquids [EMIM][Cl] and [EMIM][DCA].

通过混合1-乙基-3-甲基咪唑鎓氯化物（[EMIM] [Cl]）和1-乙基-3-甲基咪唑鎓二氰胺制成的复盐离子液体（DSIL）[EMIM] [Cl] _0.5 [DCA] _0.5（[EMIM] [DCA]）用于分离乙酸甲酯+甲醇共沸混合物。在101.3 kPa下测量了乙酸甲酯（1）+甲醇（2）+ [EMIM] [Cl] _0.5 [DCA] _0.5（3）三元系统的等压气液平衡（VLE）数据。DSIL [EMIM] [Cl] _0.5 [DCA] _0.5在低浓度的DSIL中，对乙酸甲酯产生明显的盐析作用，并且能够打破乙酸甲酯+甲醇的共沸点。采用非随机两液活度系数模型，使用三个不同的目标函数对气液平衡（VLE）数据进行关联，并基于最佳目标函数获得了NRTL模型的参数。乙酸甲酯（1）+甲醇（2）+ [EMIM] [Cl]（3）和乙酸甲酯（1）+甲醇（2）+ [EMIM] [ DCA]（3）的测量结果也为101.3 kPa。将DSIL [EMIM] [Cl] _0.5 [DCA] _0.5的分离效果与单一离子液体[EMIM] [Cl]和[EMIM] [DCA]进行了比较。