A recently proposed mixing rule has been combined with a cubic equatio
n 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 par
tial pressure in concentrated polymer solutions with high accuracy ove
r a range of temperatures and pressures with temperature-independent p
arameters. 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 approac
h are that it extends the application of cubic equations of state to p
olymer + solvent systems in a simple fashion and that generally only t
emperature-independent parameters are required which allow for accurat
e interpolation and extrapolation of available data.