Vapor–liquid equilibrium ratios for hexane at infinite dilution in ethylene+impact polypropylene copolymer and propylene+impact polypropylene copolymer

Vapor–liquid equilibrium ratios (Kw1∞ values) for hexane at infinite dilution in propylene+impact polypropylene copolymer (ICP–PP) and ethylene+ICP–PP systems were measured at temperatures 323.2, 343.2 and 363.2 K and pressures up to 2.4 MPa using a chromatographic technique. The solubilities of propylene in polypropylene and those of propylene, ethylene, and hexane in ICP–PP were measured. The PVT properties of the polypropylene and ICP–PP were also studied. These data were used to determine the pure component and binary interaction parameters for the Sanchez–Lacombe equation of state (S–L EOS). The Kw1∞ values were predicted by using the S–L EOS with binary parameters evaluated by correlation of phase-equilibrium data of binary systems. Good agreement between the experimental and calculated Kw1∞ values was obtained by optimizing the equation parameters.