Abstract

In the last years, mixing ionic liquids (ILs) is a common trend looking for IL-based solvents with high extractive properties in the liquid–liquid extraction of aromatics from alkanes. The aim of mixing ILs is to find intermediate extractive properties between ILs which showed good selectivity and those with high aromatic capacity of extraction. In addition to this, there are several thermophysical properties that are of interest to evaluate an IL-based solvent. Therefore, many studies have been carried out focusing on the knowledge of density, viscosity, or surface tension behavior of IL mixture, proposing several mixing rules that could correctly predict these magnitudes from pure IL data in most of the mixtures studied. However, only a few measurements of thermal stabilities and specific heats for IL binary mixtures have been recently realized. The present study was aimed to evaluate the thermal stability of {[bpy][BF4] + [bpy][Tf2N]} and {[bpy][BF4] + [4bmpy][Tf2N]} IL mixtures by thermogravimetric analysis. Also specific heats of the IL mixtures were determined using differential scanning calorimetry.

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