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

1,3-二甲基咪唑四氟硼酸盐的合成及其水溶液的蒸气压测定(英文)

作　　者：武向红 李静 范丽华 郑丹星 董丽 

机构地区：[1]College of Chemical Engineering,Beijing University of Chemical Technology

出　　处：《Chinese Journal of Chemical Engineering》2011年第3期473-477,共5页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(50890184);the National Basic Research Program of China(2010CB227304)

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.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 

分 类 号：O621.3[理学—有机化学]