【摘要】 离子液体是一类新型绿色溶剂,具有蒸汽压极低,不挥发,不易燃,宽液程和良好的热稳定性,对许多有机物和无机物有良好的溶解性。前期的研究发现,离子液体乙基甲基咪唑磷酸二乙酯[EMIM][DEP]与H₂O、C₂H₅OH和CH₃OH有良好的溶解性,所构成的二元溶液表现出对拉乌尔定律显著的负偏差,这些性质使得离子液体[EMIM][DEP]有可能成为吸收制冷/热泵循环的新型吸收剂。二元工质溶液[EMIM][DEP]+H₂O/C₂H_OH/CH₃OH的混合热以及比热容是分析吸收制冷/热泵性能重要的热力学基础数据之一。本文采用绝热量热法对[EMIM][DEP]分别与水,乙醇和甲醇所构成的3个二元溶液体系,在25℃以及不同浓度下的混合热进行了测量,并采用Redlich-Kister方程对数据进行了关联。实验结果表明,[EMIM][DEP]与水,乙醇和甲醇的混合过程均为放热过程,混合热大小次序是H₂O>CH₃OH>C₂H₅OH。对3个二元溶液体系在不同温度和浓度下的比热容进行了测量,并采用浓度的多项式函数对其进行关联。结果发现,离子液体溶液的比热容随温度的增加而线性增加,随离子液体的含量增加而降低。更多还原

【Abstract】 Ionic liquid is a new kind of green solvent.It has many advantages,such as negligible vapor pressure,non-flammability,wide liquid state range,thermal stability and good solubility to many kinds of organic or inorganic solvent.Ionic liquids,1-ehtyl-3-methylimidazolium diethylphosphate（[EMIM][DEP]） has good solubility to water,ethanol or methanol and corresponding binary solutions,[EMIM][DEP]+ H₂O /C₂H₅OH/CH₃OH displayed a considerable negative deviation from Raoult’s law in our previous study,which indicated that[EMIM][DEP]had the potential to be a new absorbent for absorption refrigeration or absorption heat pump.The mixing heat and specific heat capacity of[EMIM][DEP] with H₂O/C₂H₅OH/CH₃OH are one of important basic physical properties for simulating thermodynamic performance of absorption cycle with these new working fluids.In present research,the mixing heat of[EMIM][DEP]with H₂O/C₂H₅OH/CH₃OH were measured at 25℃and at different IL concentration by heat insulation method.The experimental data were correlated by Rwdlich-Kister equation.The results indicated that the mixing processes were all exothermic and the magnitude of mixing heat is in the order of H₂O>CH₃OH>C₂H₅OH.The specific heat capacities of these binary solution were measured at different IL concentration and temperature.The experimental results were also correlated in the form of the power functions of IL concentration.The results indicated that the specific heat capacity would increase directly with temperature and decrease with the increase of IL concentration.更多还原