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In order to optimize reaction and separation processes, knowledge of the phase behaviour of the system is of fundamental importance. In this contribution we present the solid-liquid and liquid-vapour equilibria of the ternary system 1-butyl-3-methylimidazolium tetrafluoroborate + (S)-naproxen + carbon dioxide. Five different samples were studied, with CO 2 concentrations ranging from 10 to 50 mol%, and pressure and temperature conditions of 1 to 14 MPa, and 310 to 370 K, respectively. It is shown that the amount of CO 2 influences not only the location of the homogeneous liquid phase region, but also the extension of the region in which it occurs. Based on the collected experimental data, optimum pressure and temperature conditions can be selected for the precipitation of (S)-naproxen from the ionic liquid in order to improve the efficiency of the separation.

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in Wiley InterScience (www.interscience.wiley.com).This work presents the results of the use of a Group Contribution Equation of State (GC-EOS) to model experimental data obtained for ternary systems of the type bmim[BF 4 ] þ organic solute þ CO 2 with four different organic compounds, namely acetophenone, 1-phenylethanol, 4-isobutylacetophenone, and 1-(4-isobutylphenyl)-ethanol. Our results show that the GC-EOS is able to qualitatively predict not only LþV!L but also L 1 þL 2 !L phase transitions. As the two two-phase boundaries LþV and L 1 þL 2 of the experimentally found three-phase region L 1 þL 2 þV almost coincide with the saturated vapor pressure curve of pure CO 2 , the phase transitions LþV!L 1 þL 2 þV and L 1 þL 2 þV!L 1 þL 2 have been represented as this vapor-pressure curve by the model. The average absolute deviations between experimental and predicted values for all phase transitions have been found to be very satisfactory.