This study investigates the phase equilibrium behavior of the isopropyl acetate (IAC)-isopropanol (IPA) azeotrope system at 101.3 kPa in the presence of three different imidazolium-based ionic liquids (ILs) as entrainers, 1-butyl-3-methylimidazolium acetate ([BMIM][Ac]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf₂]), and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][NTf₂]). First, according to the measured vapor–liquid equilibrium (VLE) data of the binary system IAC(1)-IPA(2) and the ternary system IAC(1)-IPA(2)-ILs(3), [BMIM][Ac] in the ternary system produces a strong salting-in effect on IPA, while [BMIM][NTf₂] and [HMIM][NTf₂] produces a salting-in effect on IAC, and the effect of [BMIM][Ac] is much stronger than [BMIM][NTf₂] and [HMIM][NTf₂]. This work uses the nonrandom (local) two-liquid equation to correlate the VLE data. The mole fractions of [BMIM][Ac], [BMIM][NTf₂], and [HMIM][NTf₂] required to exactly eliminate the azeotropic point of the IAC-IPA system are 0.035, 0.144, and 0.206, respectively.

中文翻译：

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乙酸异丙酯-异丙醇-咪唑基离子液体在 101.3 kPa 下的等压相平衡

本研究研究了乙酸异丙酯 (IAC)-异丙醇 (IPA) 共沸物体系在 101.3 kPa 下，在三种不同的咪唑基离子液体 (IL) 作为共沸剂（1-丁基-3-甲基咪唑乙酸盐）存在下的相平衡行为。 [BMIM][Ac])、1-丁基-3-甲基咪唑鎓双(三氟甲基磺酰基)亚胺([BMIM][NTf ₂ ])和1-己基-3-甲基咪唑鎓双(三氟甲基磺酰基)亚胺([HMIM][NTf ₂ ]）。首先，根据二元体系IAC(1)-IPA(2)和三元体系IAC(1)-IPA(2)-ILs(3)实测气液平衡(VLE)数据，[BMIM][三元体系中的Ac]对IPA产生较强的盐析作用，而[BMIM][NTf ₂ ]和[HMIM][NTf ₂ ]对IAC产生盐析作用，[BMIM][Ac的作用]比[BMIM][NTf ₂ ]和[HMIM][NTf ₂ ]强得多。这项工作使用非随机（局部）二液方程来关联 VLE 数据。精确消除IAC-IPA体系的共沸点所需的[BMIM][Ac]、[BMIM][NTf ₂ ]和[HMIM][NTf ₂ ]摩尔分数分别为0.035、0.144和0.206。