Abstract: The ionic liquid 1-butyl-3-methylimidazolium dibutylphosphate (［BMIM］［DBP］) was prepared and vapor pressure for three binary systems composed of ［BMIM］［DBP］and water, methanol or ethanol were measured at different temperature and mole fraction with static method, the data was correlated with NRTL activity coefficient model. The results indicate that the binary solutions are all negative deviation from the Roualt’s Law, which make them to be suitable as candidates for working pairs in industrial applications of absorption heat pumps. Meanwhile the experimental data can be well correlated by NRTL equations with the average relative deviations (ARD) of 2.37%, 2.51% and 1.89%, respectively.

Key words: ionic liquid, static method, vapor-liquid equilibrium, NRTL model, negative deviation

摘要： 合成了离子液体1-丁基-3-甲基咪唑磷酸二丁酯(［BMIM］［DBP］)，用静态法测量了［BMIM］［DBP］与H₂O/CH₃OH/C₂H₅OH 所形成的3个二元体系的汽液平衡数据，并用NRTL模型对活度因子进行关联。实验结果表明，［BMIM］［DBP］+H₂O/CH₃OH/C₂H₅OH二元体系汽液平衡数据对Roualt定律呈负偏差，说明3个体系均可作为吸收式热泵的潜在工质。3个体系的关联结果与实验数据的平均相对误差分别为2.37%、2.51%和1.89%。

关键词: 离子液体, 静态法, 汽液平衡, NRTL模型, 负偏差