1994 Volume 37 Issue 3 Pages 236-245
The group contribution models, which are the predictive methods of activity coefficients, have been used for predicting low-pressure vapor-liquid equilibria. At present, ASOG and UNIFAC are applicable to binary and multicomponent systems composed of about 50 groups. Lately ASOG and UNIFAC can be applied for predicting high-pressure vapor-liquid equilibria by using the cubic equation of state and excess free-energy mixing rule. The applicable range of models covers the systems including both non-polar and polar substances, polymers, and electrolytes. The properties contains solubilities like liquid-liquid equilibria, solid-liquid equilibria, gas solubility, and solid-vapor equilibria, and excess enthalpies.
This paper reviews the recent research work on prediction of thermodynamic properties using ASOG and UNIFAC.
