The use of ionic liquids (ILs) for separation processes is promising because of their unique properties. Some organic mixtures forming azeotropes are very challenging to separate. In order to find the most suitable ionic liquid for a specific separation problem, systematic measurements of the different thermophysical properties such as vapor-liquid equilibria (VLE) data and activity coefficients are necessary to develop processes and predictive thermodynamic models.The aim of this work is to evaluate the efficiency of ionic liquids for separation problems frequently encountered in the chemical industry. In this way, VLE of binary and ternary mixtures including organic compounds and various ionic liquids have been measured by Headspace / Gas Chromatography. Activity coefficients ?i of the organic compounds in the ionic liquids have been determined from the experimental data and have been correlated using activity coefficients models, including the Non-Random Two Liquid (NRTL) and Universal Quasichemical Theory (UNIQUAC) equations.

Use of ionic liquids as entrainers in extractive distillation

243rd National Meeting (2012)

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