This work studied the separation effect of 1-hexyl-3-methylimidazolium-based ionic liquids (1-hexyl-3-methylimidazolium tetrafluoroborate [HMIM][BF₄] and 1-hexyl-3-methylimidazolium trifluoromethanesulfonate [HMIM][OTF]) to separate a methanol and acetonitrile azeotropic system. The isobaric vapor–liquid equilibrium data obtained for the ternary systems {methanol + acetonitrile + ([HMIM][BF₄] or [HMIM][OTF])} were measured at 101.3 kPa. Based on the nonrandom two-liquid model, the minimum mole fractions of [HMIM][BF₄] and [HMIM][OTF] required to eliminate the azeotrope point of the methanol + acetonitrile mixtures were 0.047 and 0.042, respectively. Through the analysis of the σ-profiles and separation ability, [HMIM][OTF] was a suitable entrainer to separate the methanol–acetonitrile azeotrope.

中文翻译：

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1-己基-3-甲基咪唑鎓离子液体对甲醇和乙腈在101.3 kPa的等压蒸气-液体平衡的影响及其机理

这项工作研究了基于1-己基-3-甲基咪唑鎓的离子液体（1-己基-3-甲基咪唑鎓四氟硼酸酯[HMIM] [BF ₄ ]和1-己基-3-甲基咪唑鎓三氟甲烷磺酸酯[HMIM] [OTF]）的分离效果。分离甲醇和乙腈共沸体系。在101.3 kPa下测量了三元体系{甲醇+乙腈+（[HMIM] [BF ₄ ]或[HMIM] [OTF]）的等压气液平衡数据。基于非随机两液模型，[HMIM] [BF ₄消除甲醇+乙腈混合物的共沸点所需的]和[HMIM] [OTF]分别为0.047和0.042。通过分析σ分布和分离能力，[HMIM] [OTF]是分离甲醇-乙腈共沸物的合适夹带剂。