Thirty Years with EoS/GE Models - What Have We Learned?

Georgios M. Kontogeorgis, Philippos Coutsikos

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Thirty years of research and the use of EoS/GE mixing rules in cubic equations of state are reviewed. The most popular approaches are presented both from the derivation and application points of view and they are compared to each other. It is shown that all methods have significant capabilities but also limitations which are discussed. A useful approach is presented for analyzing the models by looking at the activity coefficient expression derived from the equations of state using various mixing rules. The size-asymmetric systems are investigated in detail, and an explanation is provided on how EoS/GE mixing rules should be developed so that such asymmetric mixtures are adequately represented. © 2012 American Chemical Society.
Original languageEnglish
JournalIndustrial & Engineering Chemistry Research
Issue number11
Pages (from-to)4119-4142
Publication statusPublished - 2012

Bibliographical note

© 2012 American Chemical Society


  • Engineering
  • Equation-of-state
  • Vapor-liquid-equilibria
  • Peng-Robinson equation EQUATION
  • Excess free-energy
  • Supercritical carbon-dioxide
  • Sandler mixing rules
  • Soave-Redlich-Kwong
  • Activity-coefficient model
  • Fluid-phase equilibria
  • Unifac-basen equation


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