Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol + dimethyl carbonate azeotropic systems

doi:10.1016/j.cjche.2019.12.001

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (3): 766-776.DOI: 10.1016/j.cjche.2019.12.001

• Separation Science and Engineering • Previous Articles Next Articles

Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol + dimethyl carbonate azeotropic systems

Songsong Chen^1,2, Li Dong^1,4, Junping Zhang^1,2, Weiguo Cheng¹, Feng Huo^1,4, Qian Su^1,2, Wei Hua³

1 Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China;
2 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3 SINOPEC, Beijing Yanshan Company, Beijing 102500, China;
4 Dalian National Laboratory for Clean Energy, Dalian 116023, China

Received:2019-06-20 Revised:2019-11-18 Online:2020-06-11 Published:2020-03-28
Contact: Li Dong
Supported by:
This work was supported by the National Key R & D Program of China (2018YFB0605804), the National Natural Science Foundation of China (21606237), the Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences (XDA 21030500), the Fund of State Key Laboratory of Multiphase Complex Systems, IPE, CAS (MPCS-2019-A-02), and the DNL Cooperation Fund, CAS (DNL180202). Sincerely appreciate Prof. Suojiang Zhang (IPE, CAS) for his careful academic guidance and great support.

Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol + dimethyl carbonate azeotropic systems

Songsong Chen^1,2, Li Dong^1,4, Junping Zhang^1,2, Weiguo Cheng¹, Feng Huo^1,4, Qian Su^1,2, Wei Hua³

1 Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China;
2 School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3 SINOPEC, Beijing Yanshan Company, Beijing 102500, China;
4 Dalian National Laboratory for Clean Energy, Dalian 116023, China

通讯作者: Li Dong
基金资助:
This work was supported by the National Key R & D Program of China (2018YFB0605804), the National Natural Science Foundation of China (21606237), the Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences (XDA 21030500), the Fund of State Key Laboratory of Multiphase Complex Systems, IPE, CAS (MPCS-2019-A-02), and the DNL Cooperation Fund, CAS (DNL180202). Sincerely appreciate Prof. Suojiang Zhang (IPE, CAS) for his careful academic guidance and great support.

Abstract

Abstract: 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 components were calculated using Gaussian program, and the effects of cation and anion on the separation coefficient of the azeotropic system were discussed.

Key words: Vapor liquid equilibria, Ionic liquid, Azeotrope, Separation, Interaction energy

摘要： 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 components were calculated using Gaussian program, and the effects of cation and anion on the separation coefficient of the azeotropic system were discussed.

关键词: Vapor liquid equilibria, Ionic liquid, Azeotrope, Separation, Interaction energy

Songsong Chen, Li Dong, Junping Zhang, Weiguo Cheng, Feng Huo, Qian Su, Wei Hua. Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol + dimethyl carbonate azeotropic systems[J]. Chinese Journal of Chemical Engineering, 2020, 28(3): 766-776.

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Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol + dimethyl carbonate azeotropic systems

Effects of imidazolium-based ionic liquids on the isobaric vapor-liquid equilibria of methanol + dimethyl carbonate azeotropic systems

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