Van der Waals Mixing Rules for Cubic Equations of State

Abstract

A new concept for the development of mixing rules for cubic equations of state consistent with statistical mechanical theory of the van der Waals mixing rules is introduced. Utility of this concept is illustrated by its application to the Redlich-Kwong (RK) and the Peng-Robinson (PR) equations of state. The resulting mixing rules for the Redlich-Kwong and the Peng-Robinson equations of state are tested through prediction of solubility of heavy solids in supercritical fluids and prediction of phase behavior of binary mixtures of hydrocarbons and nonhydrocarbons.