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 GE mixing rule consistent with the second virial coefficient condition for calculating the mixture parameters in Peng–Robinson EOS and predicts the GE using ASOG method. The first object of this paper is to predict low-pressure vapor–liquid equilibria (VLE) using PRASOG for 37 binary systems containing alcohols, hydrocarbons, ketones, esters, ethers, aromatic compounds and water. The PRASOG model has been then used to predict high-pressure VLE for ammonia-containing systems. In order to apply PRASOG to polymer solutions, PRASOG-FV has been proposed by calculating GE from ASOG-FV and VLE in polyisobutylene solutions have been then predicted.