A G^E/Equation of State Mixing Rule for Vapor-Liquid Equilibria

A new excess Gibbs free energy/equation of state type mixing 0rule was derived byremoving the infinite pressure boundary condition imposed by Wong and Sandler.The mixing rulewas extensively tested in terms of a comprehensive data base,consisting of 52 simple nonpolar-nonpolar,carbon dioxide containing,hydrocarbon-hydrocarbon,CFC,polar-polar,nonpolar-polarbinary and multicomponent systems.Focused on the complete predictive capability,a comparisonbetween the Wong-Sandler and the mixing rule proposed was conducted.The results indicate that thenew mixing rule is in general superior to the Wong-Sandler’s,and the binary interaction parameteras required by the latter is removed,which reduces computing effort and is reliable in predictions ofvapor-liquid equilibria from low pressures to high pressures.

A new excess Gibbs free energy/equation of state type mixing Orule was derived by removing the infinite pressure boundary condition imposed by Wong and Sandier. The mixing rule was extensively tested in terms of a comprehensive data base, consisting of 52 simple nonpolar-nonpofar, carbon dioxide containing, hydrocarbon-hydrocarbon, CFC, polar-polar, nonpolar-polar binary and multicomponent systems. Focused on the complete predictive capability, a comparison between the Wong-Sandier and the mixing rule proposed was conducted. The results indicate that the new mixing rule is in general superior to the Wong-Sandler's, and the binary interaction parameter as required by the latter is removed, which reduces computing effort and is reliable in predictions of vapor-liquid equilibria from low pressures to high pressures.