The study of binary interaction parameters on VLE for alternative refrigerant mixtures

Abstract

The vapor-liquid equilibrium (VLE) data for hydrofluorocarbons (HFCs) + hydrocarbons (HCs) and HFCs + dimethyl ether (DME) are correlated by the Soave-Redlich-Kwong, Peng-Robinson, and Carnahan-Starling-DeSantis, respectively, with one adjustable binary interaction parameter k ij , and each equation can represent the satisfactory results. For the three equations, the obtained optimum interaction parameter k ij is almost the same for the binaries containing the same HFC component in the same class, and when the k ij of the lack-of-data mixtures are needed, it just needs to know the k ij of any binary in the same class on the basis of the phenomena and law. Moreover, a new equation for k ij is developed that enables the three equations of state to predict the VLE properties for such mixtures within reasonable accuracy.