This work comprises the separation of an azeotropic mixture (hexane/ethyl acetate) with two different ionic liquids, viz, (1-ethyl-3-methylimidazolium tetrafluoroborate, [EMIM][BF₄], and 1-ethyl-3-methylimidazolium dicyanamide, [EMIM][DCA]. The liquid–liquid equilibrium (LLE) data for the two ternary systems were obtained at T = 298.15 K and at p = 101 kPa. Ionic liquids with the same cation but different anions (1-ethyl-3-methylimidazolium tetrafluoroborate or dicyanamide) were used to determine the ability to separate ethyl acetate from hexane. The efficiency to separate hexane + ethyl acetate with the investigated ionic liquids was assessed by calculating distribution ratios (β) and selectivity (S) values for each system. These parameters revealed the influence of the effect of anions on the ionic liquids on LLE data. The ionic liquid containing dicyanamide [DCA] anions in comparison with tetrafluoroborate [BF₄] revealed high selectivity and distribution ratio. The experimental tie lines were successfully correlated using the thermodynamic nonrandom two-liquid equation and were also used to compute the phase composition error in the mole fraction for the two ternary mixtures.

中文翻译：

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咪唑鎓离子液体与共沸混合物（己烷/乙酸乙酯）的液-液分离

这项工作包括用两种不同的离子液体，即（1-乙基-3-甲基咪唑四氟硼酸酯，[EMIM] [BF ₄ ]和1-乙基-3-甲基咪唑二氰胺）分离共沸混合物（己烷/乙酸乙酯）。，[EMIM] [DCA]。在T = 298.15 K和p = 101 kPa时获得了两个三元体系的液-液平衡（LLE）数据。阳离子相同但阴离子不同（1-乙基-用3-甲基咪唑鎓四氟硼酸酯或双氰胺确定从乙酸乙酯中分离乙酸乙酯的能力。通过计算分配比（β）和选择性（S）的值。这些参数揭示了LLE数据上阴离子对离子液体的影响。与四氟硼酸酯[BF ₄ ]相比，含有双氰胺[DCA]阴离子的离子液体显示出高的选择性和分布比。使用热力学非随机两液方程成功地关联了实验联系线，还用于计算两种三元混合物的摩尔分数的相组成误差。