Polymer-Solvent Vapor-Liquid Equilibrium: Equations of State versus Activity Coefficient Models

Hasan Orbey, Costas P. Bokis, Chau Chyun Chen

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


A Soave-Redlich-Kwong (SRK) cubic equation of state (EOS) combined with the Flory-Huggins activity coefficient (Gex) model in a Huron-Vidal type (EOS + Gex) mixing rule was used to correlate binary vapor-liquid equilibrium (VLE) of polymer-solvent mixtures. To extend the SRK EOS to pure polymers, suitable critical constants were selected based on available information for long-chain hydrocarbons. In mixture applications, the only binary interaction parameter, Χ of the Flory-Huggins model, was obtained from the infinite-dilution activity coefficient data of solvent in polymer, without using any experimental VLE information. The results show that this EOS + Gex approach can represent polymer-solvent VLE accurately. It was also observed that Χ is much less temperature- and composition-dependent when the Flory-Huggins model is coupled with the SRK EOS than it is when used directly as an activity coefficient model.

Original languageEnglish
Pages (from-to)1567-1573
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number4
StatePublished - 1998


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