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

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journal contribution
posted on 2007-09-13, 00:00 authored by Aliaksei A. Strechan, Yauheni U. Paulechka, Andrey G. Kabo, Andrey V. Blokhin, Gennady J. Kabo
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.