PREDICTION OF VAPOR-LIQUID-EQUILIBRIUM IN POLYMER-SOLUTIONS USING A PENG-ROBINSON GROUP-CONTRIBUTION MODEL

The objective of this study is to extend the applicability of a Peng-R obinson group contribution method (PRASOG), which combines a zero pres sure g(E) mixing rule for Peng-Robinson EOS with ASOG group contributi on model, to polymer solutions. The solvent activities in polymer solu tions have been predicted by PRASOG-FV which evaluates the g(E) from A SOG-FV proposed previously in order to predict the solvent activities in polymer solutions using ASOG group pair parameters. The systems dis cussed in this study are nine binary systems composed of six solvents (benzene, toluene, acetone, methyl ethyl ketone, ethyl acetate, propyl acetate) and four polymers (polystyrene, poly(ethylene oxide), poly(p ropylene oxide), poly(vinyl acetate)). The temperature range is 298.15 to 361.25 K. The accuracy using PRASOG-FV is almost comparable to tho se with ASOG-FV and UNIFAC-FV. (C) 1998 Elsevier Science B.V. All righ ts reserved.