Comparison of perturbed hard-sphere-chain theory with statistical associating fluid theory for square-well fluids

The effect of hard-sphere-chain equations on the description of phase behav ior is presented by the comparison of perturbed hard-sphere-chain (PHSC) th eory with statistical associating fluid theory (SAFT) for square-well fluid s. The PHSC-type equation of this work is based on the hard-sphere-chain eq uation of Chiew (PY-CS), the square-well fluid model of Alder et al., and t he expression of Chen and Kreglewski. The PHSC-type equation has expression s similar to those of the SAFT equation. A comparison of the PHSC-type equa tion with the SAFT model shows that the PHSC-type equation of state present s slightly better results of pure compounds and much better vapor-liquid eq uilibrium results of high-concentration polymer solutions.