Compilation of group-contribution prediction of VLE and excess enthalpy

Group contribution method constitutes a predictive method for obtaining activity coefficients based on structural formulas of components making up the solution. It is often used for preliminary design computations because of widely applicability and good accuracy. This paper described the group contribution methods (ASOG, UNIFAC, modified UNIFAC) for predicting both low and high pressure vapor–liquid equilibria (VLE). Group contribution predictions of excess enthalpy, which is indispensable for calculation of solution enthalpy, are also shown for about 300 binary systems including water group.