[EMIM][DEP]+水/乙醇工质对蒸气压测定与关联

Measurement and correlation of vapor pressure for binary systems:[EMIM][DEP]+H_2O/C_2H_5OH as working pairs

离子液体型工质溶液是吸收式热泵新的工质体系.合成了离子液体1-乙基-3-甲基咪唑磷酸二乙酯盐[EMIM][DEP],测定了离子液体[EMIM][DEP]+H2O、[EMIM][DEP]+C2H5OH两个二元体系在不同浓度、不同温度下的蒸气压数据.实验结果表明,两个体系气液相平衡特性表现为对Raoult定律的负偏差.用NRTL方程对实验数据进行了关联,拟合得到了其模型参数,通过比较发现两个体系的实验数据与模型计算值的平均相对偏差分别是2.72%和2.36%.

Binary systems containing ionic liquids are new working pairs in absorption heat pumps.Ionic liquid,1-ehtyl-3-methylimidazolium diethylphosphate（[EMIM][DEP]）,was synthesized.Vapor pressures for binary systems of[EMIM][DEP]＋H2O and[EMIM][DEP]＋C2H5OH were measured at different concentrations and temperatures.The experimental data show a considerable negative deviation of vapor-liquid equilibrium from Raoult＇s law.The vapor pressure data are correlated by NRTL model.NRTL parameters are obtained.The average relative deviation between experimental data and correlated ones are 2.72%,2.36%respectively.