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Abstract: Liquid-liquid phase equilibrium is mainly a result of intermolecular forces. Therefore hydroxylic compounds very often show a good affinity with water, due to hydrogen bonding. Consequently the ionic forces taking place when salt is added to an aqueous solution may affect this phase equilibrium. This is the main scope of this study, considering this salt effect. The effect of the addition of calcium chloride (CaCl2) on the liquid-liquid equilibrium data of the binary system water-acetone has been studied experimentally at 23°C, for different salt weight percentages of 5, 10, 15 and 20. A two- phase region has been created, decreasing the acetone solubility in water. From this study it can be concluded that ‘salting-out’ takes place with the presence of calcium chloride. [Copyright &y& Elsevier]

Abstract: An experimental study has been carried out to examine the salt effect on the liquid phase equilibria for aqueous systems showing a complete miscibility in all proportions. Two model systems have been chosen, namely water-acetone and water-2 propanol with NaCl and CaCl2 as the salts. In the second theoretical part of this work, the experimental results issued from the first part have been used to calculate the interaction parameters involved in a modified version of the NRTL equation which has been extensively used for the prediction of the liquid-liquid equilibria. It has been tested with the above two systems, in presence of the salts, and encouraging results have been obtained. [Copyright &y& Elsevier]