Prediction of azeotropic behavior using equations of state

Hugo Segura, Jaime Wisniak, Pedro G. Toledo, Andrés Mejía

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A shortcut method is developed to determine if an equation of state (EOS) is capable of predicting azeotropes in binary systems and if the azeotrope meets the critical gas-liquid equilibrium line. The method suggested allows an a priori prediction of subcritical azeotropes and an exact prediction of the azeotropic point (if any) at critical conditions. In addition, the approach developed in this work avoids computation of critical lines and simplifies phase equilibrium calculations for mixtures. The technique may be applied to every EOS (and/or mixing rule model), provided that the PVT relation exhibits the van der Waals loop in subcritical ranges. Examples are presented using cubic EOS.

Original languageEnglish
Pages (from-to)141-162
Number of pages22
JournalFluid Phase Equilibria
Issue number2
StatePublished - 23 Dec 1999


  • Azeotropy
  • Critical lines
  • Equations of state
  • Method of calculation
  • Polyazeotropy

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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