Vapor–liquid equilibrium (VLE) data for the ternary system of acetonitrile + ethanol + ionic liquids (ILs) were obtained at 101.3 kPa, and used ILs were 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf₂]), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][NTf₂]), and 1-butyl-3-methylimidazolium diethylphosphate ([BMIM][DEP]). The nonrandom two-liquid (NRTL) model was used to correlate the VLE data and fitted well, indicating that the minimum mole fractions of [BMIM][NTf₂], [EMIM][NTf₂], and [BMIM][DEP] to eliminate the azeotrope was 0.053, 0.063, and 0.065, respectively. These ILs led to an outstanding “salting-in” effect on ethanol, and the salting effect on acetonitrile was inapparent. Higher concentrations of ILs signified a stronger salt effect as well as higher equilibrium temperatures. The results indicated that [BMIM][NTf₂], [EMIM][NTf₂], and [BMIM][DEP] could be used as good candidate entrainers to separate acetonitrile and ethanol in extractive distillation.

中文翻译：

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以咪唑基离子液体为夹带剂的乙腈 + 乙醇在 101.3 kPa 下的汽液平衡

在101.3 kPa下获得乙腈+乙醇+离子液体(ILs)三元体系的气液平衡(VLE)数据，所用ILs为1-丁基-3-甲基咪唑双(三氟甲基磺酰基)亚胺([BMIM][NTf) ₂ ]）、1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）亚胺（[EMIM][NTf ₂ ]）和1-丁基-3-甲基咪唑鎓二乙基磷酸酯（[BMIM][DEP]）。非随机双液 (NRTL) 模型用于关联 VLE 数据并拟合良好，表明 [BMIM][NTf ₂ ]、[EMIM][NTf ₂ ] 和 [BMIM][DEP]的最小摩尔分数消除共沸物的效率分别为0.053、0.063和0.065。这些离子液体对乙醇产生显着的“盐析”效应，而对乙腈的盐析效应不明显。 IL 浓度越高意味着盐效应越强以及平衡温度越高。结果表明，[BMIM][NTf ₂ ]、[EMIM][NTf ₂ ]和[BMIM][DEP]可以作为萃取精馏中分离乙腈和乙醇的良好候选夹带剂。