Effect of Mono- and Di-ethanolammonium Formate Ionic Liquids on the Volatility of Water, Ethanol, and Methanol

doi:10.1016/S1004-9541(13)60582-0

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (10): 1162-1171.DOI: 10.1016/S1004-9541(13)60582-0

Effect of Mono- and Di-ethanolammonium Formate Ionic Liquids on the Volatility of Water, Ethanol, and Methanol

李雪梅^1,2, 沈冲³, 李春喜^1,2

1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2 College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
3 Liming Research Institute of Chemical Industry, Luoyang 471000, China

收稿日期:2012-09-28 修回日期:2013-01-06 出版日期:2013-10-28 发布日期:2013-10-29
通讯作者: LI Chunxi
基金资助:
Supported by the National Natural Science Foundation of China (21076005) and Research Fund for the Doctoral Program of Higher Education of China (20090010110001).

Effect of Mono- and Di-ethanolammonium Formate Ionic Liquids on the Volatility of Water, Ethanol, and Methanol

LI Xuemei^1,2, SHEN Chong³, LI Chunxi^1,2

1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2 College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
3 Liming Research Institute of Chemical Industry, Luoyang 471000, China

Received:2012-09-28 Revised:2013-01-06 Online:2013-10-28 Published:2013-10-29
Contact: LI Chunxi
Supported by:
Supported by the National Natural Science Foundation of China (21076005) and Research Fund for the Doctoral Program of Higher Education of China (20090010110001).

摘要/Abstract

摘要： Vapor pressures were measured for six binary systems containing water, ethanol, or methanol with one of the two ionic liquids (ILs) at different component concentrations and temperatures using a quasi-static ebulliometer, with the ILs mono-ethanolammonium formate ([HMEA][HCOO]) and di-ethanolammonium formate ([HDEA][HCOO]). The vapor pressures of the IL-containing binary systems are well correlated using the NRTL model with an overall average absolute relative deviation (AARD) of 0.0062. The effect of ILs on the vapor pressure depression of solvents at 0.050 mole fraction of IL is that [HDEA][HCOO] > [HMEA][HCOO], and the vapor pressure lowering degree follows the order of water > methanol > ethanol. Further, the activity coefficients of three solvents (viz. water, ethanol, and methanol) for the binary systems {solvent (1) + IL (2)} predicted based on the fitted NRTL parameters at T=333.15 K indicate that the two ILs generate a negative deviation from Raoult's law for water and methanol and a positive deviation for ethanol to a varying degree, change the relative volatility of a solvent. [HMEA][HCOO] may be a promising entrainer to efficiently separate ethanol aqueous solutions by special rectification.

关键词: vapor liquid equilibria, ionic liquid, NRTL model, activity coefficient, binary mixture

Abstract: Vapor pressures were measured for six binary systems containing water, ethanol, or methanol with one of the two ionic liquids (ILs) at different component concentrations and temperatures using a quasi-static ebulliometer, with the ILs mono-ethanolammonium formate ([HMEA][HCOO]) and di-ethanolammonium formate ([HDEA][HCOO]). The vapor pressures of the IL-containing binary systems are well correlated using the NRTL model with an overall average absolute relative deviation (AARD) of 0.0062. The effect of ILs on the vapor pressure depression of solvents at 0.050 mole fraction of IL is that [HDEA][HCOO] > [HMEA][HCOO], and the vapor pressure lowering degree follows the order of water > methanol > ethanol. Further, the activity coefficients of three solvents (viz. water, ethanol, and methanol) for the binary systems {solvent (1) + IL (2)} predicted based on the fitted NRTL parameters at T=333.15 K indicate that the two ILs generate a negative deviation from Raoult's law for water and methanol and a positive deviation for ethanol to a varying degree, change the relative volatility of a solvent. [HMEA][HCOO] may be a promising entrainer to efficiently separate ethanol aqueous solutions by special rectification.

Key words: vapor liquid equilibria, ionic liquid, NRTL model, activity coefficient, binary mixture

李雪梅, 沈冲, 李春喜. Effect of Mono- and Di-ethanolammonium Formate Ionic Liquids on the Volatility of Water, Ethanol, and Methanol[J]. Chinese Journal of Chemical Engineering, 2013, 21(10): 1162-1171.

LI Xuemei, SHEN Chong, LI Chunxi. Effect of Mono- and Di-ethanolammonium Formate Ionic Liquids on the Volatility of Water, Ethanol, and Methanol[J]. Chin.J.Chem.Eng., 2013, 21(10): 1162-1171.

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Effect of Mono- and Di-ethanolammonium Formate Ionic Liquids on the Volatility of Water, Ethanol, and Methanol

Effect of Mono- and Di-ethanolammonium Formate Ionic Liquids on the Volatility of Water, Ethanol, and Methanol

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