Vapor Pressure Measurement of Water+1,3-Dimethylimidazolium Tetrafluoroborate System

›› 2011, Vol. 19 ›› Issue (3): 473-477.

Vapor Pressure Measurement of Water+1,3-Dimethylimidazolium Tetrafluoroborate System

武向红, 李静, 范丽华, 郑丹星, 董丽

College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2010-07-30 修回日期:2011-03-17 出版日期:2011-06-28 发布日期:2011-06-28
通讯作者: ZHENG Danxing, E-mail: dxzh@mail.buct.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China(50890184);the National Basic Research Program of China(2010CB227304)

Vapor Pressure Measurement of Water+1,3-Dimethylimidazolium Tetrafluoroborate System

WU Xianghong, LI Jing, FAN Lihua, ZHENG Danxing, DONG Li

College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2010-07-30 Revised:2011-03-17 Online:2011-06-28 Published:2011-06-28
Supported by:
Supported by the National Natural Science Foundation of China(50890184);the National Basic Research Program of China(2010CB227304)

摘要/Abstract

摘要： In absorption cycles,ionic liquid(IL)1,3-dimethylimidazolium tetrafluoroborate([Dmim]BF₄)may be a promising absorbent of working pair using water as refrigerant.The vapor pressures of[Dmim]BF₄ aqueous solution were measured with the boiling-point method in the temperature range from 312.25 to 403.60 K and in the mass concentration range of 65% to 90% of[Dmim]BF₄.The experimental data were correlated with an Antoine-type equation and the Non-Random Two-Liquid(NRTL)model,and the average absolute deviations between the experimental and calculated values were 1.06% and 1.15%,respectively.For the[Dmim]BF₄ aqueous solution,the experimental vapor pressures show negative deviations from the calculated data with Raoult’s law.For higher mass concentration of the IL,the deviation is more negative.In addition,the vapor pressures,the hydrophilicity and the solubility of[Dmim]BF₄ aqueous solutions were compared with those of[Dmim]Cl aqueous solutions and [Bmim]BF₄ aqueous solutions at IL-mole fraction of 0.20.

关键词: ionic liquid, 1, 3-dimethylimidazolium tetrafluoroborate, vapor pressure, absorption cycle, working pair

Abstract: In absorption cycles,ionic liquid(IL)1,3-dimethylimidazolium tetrafluoroborate([Dmim]BF₄)may be a promising absorbent of working pair using water as refrigerant.The vapor pressures of[Dmim]BF₄ aqueous solution were measured with the boiling-point method in the temperature range from 312.25 to 403.60 K and in the mass concentration range of 65% to 90% of[Dmim]BF₄.The experimental data were correlated with an Antoine-type equation and the Non-Random Two-Liquid(NRTL)model,and the average absolute deviations between the experimental and calculated values were 1.06% and 1.15%,respectively.For the[Dmim]BF₄ aqueous solution,the experimental vapor pressures show negative deviations from the calculated data with Raoult’s law.For higher mass concentration of the IL,the deviation is more negative.In addition,the vapor pressures,the hydrophilicity and the solubility of[Dmim]BF₄ aqueous solutions were compared with those of[Dmim]Cl aqueous solutions and [Bmim]BF₄ aqueous solutions at IL-mole fraction of 0.20.

Key words: ionic liquid, 1, 3-dimethylimidazolium tetrafluoroborate, vapor pressure, absorption cycle, working pair

武向红, 李静, 范丽华, 郑丹星, 董丽. Vapor Pressure Measurement of Water+1,3-Dimethylimidazolium Tetrafluoroborate System[J]. , 2011, 19(3): 473-477.

WU Xianghong, LI Jing, FAN Lihua, ZHENG Danxing, DONG Li. Vapor Pressure Measurement of Water+1,3-Dimethylimidazolium Tetrafluoroborate System[J]. , 2011, 19(3): 473-477.

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Vapor Pressure Measurement of Water+1,3-Dimethylimidazolium Tetrafluoroborate System

Vapor Pressure Measurement of Water+1,3-Dimethylimidazolium Tetrafluoroborate System

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