A modified perturbed hard-sphere-chain equation of state: consideration ofattractive contribution

We adapted a new perturbation term reported by Bokis et al. for the modifie d perturbed hard-sphere-chain (PHSC) equation of state. The new model bette r agrees with the simulation data for illustrating both repulsive and attra ctive contributions than those of the PHSC equation of state. Three charact eristic parameters, r, sigma, and epsilon, are obtained from thermodynamic properties of pure saturated species and directly used to calculate coexist ence curves of given binary systems. Vapor-liquid equilibria and liquid-liq uid equilibria of fluids are remarkably well predicted by the model even in the case of polymer solution that shows non-ideal phase behavior. (C) 2000 Published by Elsevier Science B.V.