Abstract
We have modified the SAFT-EOS by using a temperature and density-dependent segment diameter based on the Weeks, Chandler and Andersen (WCA) perturbation theory of dense fluids. The performance of the resulting equation of state (SAFT–WCA) was investigated through the prediction of high-pressure experimental data of isotactic polypropylene in n-butane, 1-butene, propane and propylene. Results show that the SAFT–WCA EOS improves the prediction of liquid to liquid–liquid phase transitions when compared to the original SAFT-EOS and correctly accounts for the solvent effect on phase equilibrium for all polymer–solvent systems studied, especially at polymer concentrations greater than 1 wt.%.
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