关键词: 离子液体, 三元工质溶液, 混合焓, NRTL模型, 吸收制冷

Abstract: The excess molar enthalpies of binary and ternary working solutions containing ionic liquid, 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP]), [BMIM][DBP](1) + CH3OH(2)/C2H5OH(2)/H2O(2) and [BMIM][DBP](1) + CH3OH(2)/C2H5OH(2) + H2O(3) were measured with an adiabatic calorimeter at 298.15K and under the normal atmospheric pressure. The experimental excess molar enthalpies of binary working solutions were correlated with non-random two liquid (NRTL) activity coefficient model and the binary interactive parameters were obtained. It was found that the average relative deviations (ARD) between the correlated excess molar enthalpies and the experimental ones for binary solutions were 1.81%，1.44% and 0.72% respectively. The excess mole enthalpies for ternary solutions were predicted based on the binary interactive parameters, the average relative deviations between the predicted and the experimental excess mole enthalpies were 2.31% and 2.49% respectively. Meanwhile, the excess molar enthalpies for both the binary solutions and the ternary solutions were negative in the whole range of IL’s concentration, so the mixed processes of [BMIM][DBP] with water and methanol or ethanol were exothermic, Which is one of the basic properties should to be need for working solutions in absorption cycles.

Key words: ionic liquid, ternary working solution, excess molar enthalpy, NRTL model, absorption refrigeration