PREDICTION OF VAPOR-LIQUID-EQUILIBRIA IN NON-POLYMER AND POLYMER-SOLUTIONS USING AN ASOG-BASED EQUATION OF STATE (PRASOG)

An ASOG-based equation of state called PRASOG (Peng-Robinson ASOG) has been developed to predict vapor-liquid equilibria in non-polymer and polymer solutions. It makes use of the zero-pressure G(E) mixing rule consistent with the second virial coefficient condition for calculatin g the mixture parameters in Peng-Robinson EOS and predicts the G(E) us ing ASOG method. The first object of this paper is to predict low-pres sure vapor-liquid equilibria (VLE) using PRASOG for 37 binary systems containing alcohols, hydrocarbons, ketones, esters, ethers, aromatic c ompounds and water. The PRASOG model has been then used to predict hig h-pressure VLE for ammonia-containing systems. In order to apply PRASO G to polymer solutions, PRASOG-FV has been proposed by calculating G(E ) from ASOG-FV and VLE in polyisobutylene solutions have been then pre dicted. (C) 1998 Elsevier Science B.V.