Abstract
A computer simulation technique (Monte Carlo method) using 256 particles was carried out to determine the local compositions of the “LB 2” model mixture, and the local composition ratio τ ij (r) was found to be density dependent. A mole fraction dependence was introduced in this work instead of the density dependence and used to develop the Wilson type and Renon-Prausnitz type mixing rules for the parameters “a” and “b” of the van der Waals equation. However, the calculated vapor-liquid equilibrium values indicate that strong density dependence of local composition mixing rules is not generally necessary in VLE calculations using cubic equations of state.
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