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

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 ofDmim]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%ofDmim]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 theDmim]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 ofDmim]BF4 aqueous solutions were compared with those ofDmim]Cl aqueous solutions and Bmim]BF4 aqueous solutions at IL-mole fraction of 0.20.

Vapor pressure measurement of water + 1,3-dimethylimidazolium tetrafluoroborate system

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 ofDmim]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%ofDmim]BF4.The experimental data were correlated with an Antoine-type equation and the Non-Random Two-Liquid(NRTL)model,and the average absolute deviations betw...