Abstract
The use of ionic liquids (IL) at elevated temperatures has revealed interest in the study of evaporation and thermal decomposition (thermolysis) processes that determine the thermal stability of IL. In this work the evaporation of 1-ethyl-3-methyl-imidazolium chloride ([EtMIm][Cl]), which is accompanied by the significant thermal decomposition, was studied by the Knudsen cell mass spectrometry. The composition of gas phase over [EtMIm][Cl] and its change in time were established in the temperature range of 403–449 K. The saturated vapor pressures, vaporization enthalpy and rate constants of thermolysis reactions were determined. The equilibrium and rate constants for gas-phase thermolysis reactions of [EtMIm][Cl] were calculated by the quantum chemical methods. Based on the results of experiments and calculations, the processes responsible for mass loss – thermolysis and evaporation – were quantitatively described.
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