Prediction of vapor-liquid equilibria at high pressures using mixing rules based on excess gibbs energy models

摘要

A modified procedure of using the Huron-Vidal (1979) mixing rule based on activity coefficients at infinite dilution at low pressures, is shown to be useful for making vapor-liquid equilibrium predictions for non ideal mixtures at high temperatures and pressures. We compare the performances of this mixing rule (called HVID model), coupled with the SRK equation of state and a reduced UNIQUAC model, with those of two other equa- tions of state mixing rules, one by Kahl and Michelsen (MHV2) and another by Wong and Sandler (Ws).