Tj. Chou et al., SALTING EFFECT ON THE LIQUID-LIQUID EQUILIBRIA FOR THE PARTIALLY MISCIBLE SYSTEMS OF N-PROPANOL-WATER AND I-PROPANOL-WATER, Industrial & engineering chemistry research, 37(5), 1998, pp. 2039-2044
The liquid-liquid equilibria (LLE) data were experimentally measured f
or the partially miscible systems of n-propanol-water-NaCl, n-propanol
-water-NaBr, n-propanol-water-KCl, and i-propanol-water-NaCl at 25 deg
rees C. A method of calculation for the prediction of the salting effe
ct on the LLE of organic aqueous solutions was proposed to correlate t
he experimental tie-line data. In the proposed method, the activity co
efficients of the solvents were calculated by Tan's modified Wilson mo
del which was combined with a vapor pressure model of electrolyte solu
tions, and the mean ionic activity coefficient was calculated by the G
ibbs-Duhem equation. The parameters required by the proposed method co
uld be estimated by the vapor pressures of a water-salt system and the
alcohol-water interaction parameters in the liquid-phase activity coe
fficient model. No ternary parameter was required. The proposed method
has been used to predict the LLE data measured by this work, and the
overall average deviation of tie-line compositions was 0.018.