1-Butyl-3-methylimidazolium Tosylate Ionic Liquid:Heat Capacity,Thermal Stability,and Phase Equilibrium of Its Binary Mixtures with Water and Caprolactam

摘要

Heat capacity for 1-butyl-3-methylimidazolium tosylate[C4mim][Tos]in the temperature range(5 to 370)K has been measured by adiabatic calorimetry.Temperatures and enthalpies of its phase transitions have been determined.Thermodynamic functions have been calculated for crystalline and liquid states.The thermal stability of[C4mim][Tos]has been determined by scanning calorimetry.Mutual solubility in binary mixtures of[C4mim]-[Tos]with water and caprolactam has been investigated,and the activity coefficients have been calculated.Heat capacities for three mixtures of[C4mim][Tos]with water have been measured by adiabatic calorimetry.On the basis of the calorimetric and SLE measurements for([C4mim][Tos]+water)samples the heat capacity anomalies have been interpreted.