A recently proposed mixing rule has been combined with a cubic equation of state to correlate the vapor‐liquid equilibria of various polymer + solvent and solvent + long chain hydrocarbon mixtures. We find that the two‐parameter version of this model can correlate the solvent partial pressure in concentrated polymer solutions with high accuracy over a range of temperatures and pressures with temperature‐independent parameters. For the solvent + long chain hydrocarbon systems, for which accurate vapor‐phase concentrations are also important, the model is best used as a three‐parameter correlation. Advantages of this approach are that it extends the application of cubic equations of state to polymer + solvent systems in a simple fashion and that generally only temperature‐independent parameters are required which allow for accurate interpolation and extrapolation of available data.
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Orbey et al. (1994) studied this question.
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