Abstract
The applicability of the recently proposed F-function of Shaw and Lielmezs and Mak and Lielmezs, modified to fit the van der Waals type cubic equation of state, has been studied over a wide range of P-V-T-x values by means of available gas and liquid state experimental data for pure substances and binary mixtures. New optimum binary interaction parameters L ij = L ij( T, P, x), functionally dependent on temperature ( T), pressure ( P) and composition ( x), were introduced for 18 selected binary mixtures. The predicted (this work) saturated vapour pressure and liquid and vapour volume values for pure substance and liquid and vapour compressibility factor values for binary systems are in excellent agreement with the experimental data, and show a slight edge over the values calculated by means of the original Redlich-Kwong-Soave (RKS) and Peng-Robinson (PR) equations.
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