The use of the F-function of the two-parameter cubic equation of state in vapour—liquid equilibrium calculations of binary mixtures

Abstract

The recently developed F-function of Shaw and Lielmezs, Mak and Lielmezs, and Liu, Lim and Lielmezs, modified to fit the van der Waals type cubic equations of state, has been used to assess the vapour—liquid equilibria calculations of binary mixtures over a wide range of P– T– x– y values. Sets of coefficients for use in the binary interaction parameter function L ij = L ij ( T, P, x i ) were determined for 23 representative binary mixtures. The prediction (this work) of the vapour—liquid equilibria (bubble point calculations) of the binary systems considered are in excellent agreement with the experimental data, and show slight improvement over the values obtained by means of the original Redlich—Kwong—Soave (RKS) and Peng—Robinson (PR) equations.