Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol plus dimethyl carbonate azeotropic systems
Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol plus dimethyl carbonate azeotropic systems
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咪唑基离子液体对甲醇—碳酸二甲酯共沸体系等压汽液平衡的影响
DOI：
10.1016/j.cjche.2019.12.001
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发表时间：
2020-03-01
影响因子：
3.8
通讯作者：
Hua, Wei
中科院分区：
文献类型：
--
作者：
Chen, Songsong;Dong, Li;Hua, Wei
甲醇（MeOH）和碳酸二甲酯（DMC）的分离是重要的，但由于形成共沸混合物而困难。在101.3 kPa下，测定了含有不同咪唑基离子液体（ILs）的三元体系，即：MeOH + DMC + 1-丁基-3-甲基咪唑双[（三氟甲基）磺酰]亚胺（[Bmim][Tf2N]）、MeOH + DMC + 1-乙基-3-甲基咪唑双[（三氟甲基）磺酰]亚胺（[Emim][Tf2N]）和MeOH + DMC + 1-乙基-3-甲基咪唑六氟磷酸盐（[Emim][PF6]）的等压汽液平衡（VLE）数据。IL的摩尔分数在0.05 ~ 0.20之间变化。实验数据分别与NRTL方程和Wilson方程相关。结果表明，咪唑基离子氧化酶有利于提高MeOH对DMC的相对挥发性，而[Bmim][Tf2N]对MeOH的活度系数表现出更为优异的性能。用高斯程序计算了体系组分的相互作用能，讨论了正离子和阴离子对共沸水体系分离系数的影响。（三）2019中国化学工业与工程学会、化学工业出版社股份有限公司版权所有。
The separation of methanol (MeOH) and dimethyl carbonate (DMC) is important but difficult due to the formation of an azeotropic mixture. In this work, isobaric vapor-liquid equilibrium (VLE) data for the ternary systems containing different imidazolium-based ionic liquids (ILs), i.e. MeOH + DMC + 1-butyl-3-methy-limidazolium bis[(trifluoromethyl)sulfonyl]imide ([Bmim][Tf2N]), MeOH + DMC + 1- ethyl-3-methyl-imidazolium bis [( trifluoromethyl)sulfonyl]imide ([Emim][Tf2N]), and MeOH + DMC + 1-ethyl-3-methylimidazolium hexafluorophosphate ([Emim][PF6])) were measured at 101.3 kPa. The mole fraction of IL was varied from 0.05 to 0.20. The experimental data were correlated with the NRTL and Wilson equations, respectively. The results show that imidazolium-based ILs were beneficial to improve the relative volatility of MeOH to DMC, and [Bmim][Tf2N] showed a much more excellent performance on the activity coefficient of MeOH. The interaction energies of system componentswere calculated using Gaussian program, and the effects of cation and anion on the separation coefficient of the azeotropic system were discussed. (C) 2019 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.