Calculation of infinite dilution activity coefficients by the NRTL and UNIQUAC models

Y. Demirel

Research output: Contribution to journalComment/debatepeer-review

22 Scopus citations


Infinite dilution activity coefficients have been calculated for 42 binary systems using the NRTL and UNIQUAC models. Temperature dependent parameters of the models are used in the calculations. These parameters have been estimated by using excess Gibbs free energy and enthalpy of mixing data simultaneously. The calculated values are compared with experimental infinite dilution activity coefficients obtained by extrapolation of vapor‐liquid equilibrium (VLE) data published in the literature. The agreement between the calculated and experimental values is poor for highly nonideal system. The selection of the best model is difficult and may be system dependent.

Original languageEnglish (US)
Pages (from-to)697-701
Number of pages5
JournalThe Canadian Journal of Chemical Engineering
Issue number4
StatePublished - Aug 1990


  • NRTL model
  • UNIQUAC model
  • limiting activity coefficients
  • temperature dependent parameters

ASJC Scopus subject areas

  • Chemical Engineering(all)


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