On the calculations of azeotropes from the NRTL and UNIQUAC models

Y. Demirel

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The local composition models of NRTL and UNIQUAC have been used in predicting of azeotropic data for binary and ternary liquid mixtures of various types. Activity coefficients have been calculated using the temperature dependent parameters of the models. In order to avoid the convergence problem of Newton's method due to initializing the unknowns,the step controlled Newton's method has been used. The results show that the performance of the UNIQUAC model is slightly better than that of the NRTL model. However the performances of the models change from one mixture to another.

Original languageEnglish (US)
Pages (from-to)1-13
Number of pages13
JournalFluid Phase Equilibria
Issue numberC
StatePublished - Jul 1 1993


  • NRTL and UNIQUAC models
  • Newton's method
  • azeotropes
  • theory

ASJC Scopus subject areas

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


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