Simultaneous representation of excess enthalpy and vapor-liquid equilibrium data by the NRTL and UNIQUAC models

Yaşsar Demirel, Hatice Gecegörmez

Research output: Contribution to journalArticle

30 Scopus citations


Using data for excess Gibbs energy, gE, and enthalpy of mixing, hE, temperature-dependent parameters of the NRTL and UNIQUAC models have been estimated for 44 systems of binary mixtures. Thirty-three of them include data for gE and hE at more than one different isotherm. The estimated parameters were later tested by predicting the total pressure, vapor-phase compositions and gE and hE data simultaneously and presenting the effect of temperature on such data. System-dependency of the models, non-uniqueness in the parameters and the possibility of predicting partial miscibility for completely miscible non-ideal mixtures have been investigated.

Original languageEnglish (US)
Pages (from-to)111-133
Number of pages23
JournalFluid Phase Equilibria
Issue numberC
Publication statusPublished - 1991


ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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