VAPOR-LIQUID-EQUILIBRIUM OF THE ACETONE WATER SALT SYSTEM

Isobaric vapor-liquid equilibrium (VLE) data were measured for the binary system acetone-water at 0.2-1.013 bar and for the acetone-water-salt systems at 1.013 bar and at different salt concentrations. All the salts investigated in this work, LiCl, NaBr, KBr, and KI, exhibited a salting out effect which increases with the increasing salt concentration. The obtained data were used for the estimation of the interaction parameters between acetone and the salt ions by applying the extended UNIQUAC method of Sander et al. These estimated interaction parameters were used with other parameters presented in the literature in the VLE calculations. Application of the model to the salt-free system at different pressures and to the acetone-water-salt systems showed that the vapor-phase composition could be represented with good accuracy up to a salt molality of 4 mol/kg of solvent, and that relatively higher deviations were obtained between the experimental and calculated vapor compositions at higher salt molalities. The deviations in vapor-phase mole fractions were 0.02 for the salt-free system over 75 binary data points and 0.037 for mixed solvent-salt systems over 167 ternary data points.