Modeling the high-pressure behavior of binary mixtures of carbon dioxide+alkanols using an excess free energy mixing rule

M. Castier, L. A. Galicia-Luna, S. I. Sandler

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2 Citations (Scopus)


The behavior of binary mixtures of carbon dioxide+alkanol (1-butanol, 2-butanol, 1-pentanol, or 2-pentanol) at high pressures was modeled using the Stryjek-Vera version of the Peng-Robinson equation of state. Two mixing rules were compared for this purpose: the classical one-fluid van der Waals and the Wong-Sandler mixing rules. In the case of the latter mixing rule, the NRTL model for the excess Gibbs free energy was used. We observed that both mixing rules can reproduce the qualitative aspects of the critical diagrams of these binary mixtures. A comparison of the results shows that there is no clear superiority of one mixing rule over the other in terms of the ability to predict the critical behavior of these mixtures.

Original languageEnglish
Pages (from-to)659-666
Number of pages8
JournalBrazilian Journal of Chemical Engineering
Issue number4
Publication statusPublished - Oct 2004
Externally publishedYes



  • Alkanols
  • Carbon dioxide
  • Critical points
  • High pressure

ASJC Scopus subject areas

  • Chemical Engineering(all)

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