The study of influence of salt on vapour liquid equilibrium of solvent mixture is of interest, because addition of salt to a mixed solvent will enhance the relative volatility and break azeotrope of the mixture.Salt-Effect distillation is a method of Extractive distillation in which salt is dissolved in the mixture of liquids to be distilled. The salt acts as a separating agent by raising the relative volatility of the mixture and by breaking any azeotropes that may otherwise form.Vapour-liquid

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... equilibrium (VLE), is a condition where a liquid and its vapour (gas phase) are in equilibrium with each other or more precisely a state where the rate of evaporation equals the rate of condensation on a molecular level such that there is no overall vapor-liquid inter-conversion. The addition of calcium chloride to this solvent mixture increases the water concentration in vapour phase at equilibrium. This indicates a preferential association of salt with less volatile component, acetic acid in the acetic acid-water mixture, water is more volatile component in acetic acid-water mixture. Most of the Salt effect studies were carried out at saturated level of salt. The objective is to study the effect of addition of CaCl 2 on separation of Acetic acid-water mixture and to find out the possibility of the use of concentrated solution of CaCl 2 as a solvent for separating dilute solution of acetic acid in water by extractive distillation process.