Abstract
A study was undertaken to determine the potential for using infinite-dilution excess enthalpy data with activity coefficient models to predict vapor-liquid equilibria for binary systems. Expressions for the infinite-dilution reduced excess enthalpies in a binary liquid mixture derived from the Wilson or NRTL equation with temperature-independent parameters are solved for two unknown model parameters given limiting values of reduced excess enthalpy (partial molar excess enthalpy) H E /x 1 x 2 . The Wilson equation is modified using the van der Waals covolume b in place of the pure-liquid molar volume, and an average value of the nonrandomness factor is chosen to obtain a two-parameter NRTL equation. Vapor-liquid equilibria were predicted for 19 isothermal and 8 isobaric binary systems. Good results are generally obtained for nearly ideal systems using either model; however, the Wilson equation is superior for moderately nonideal systems. The temperature-independent Wilson model fails to accurately describe vapor-liquid equilibria for strongly nonideal mixtures with highly unsymmetric excess enthalpy profiles. The proposed method appears to be particularly well suited for estimating phase behavior of environmentally safe refrigerant mixtures
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