Application of an improved simplified perturbed hard chain theory equation of state for pure compounds and binary asymmetric mixtures

Kh Nasrifar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The simplified perturbed hard chain theory equation of state is modified using recently developed repulsive and attractive terms. Both terms meet the low density and close-packed density boundary conditions and are in reasonable agreement with molecular simulation data. The modified equation of state accurately predicts pure component properties including saturated vapor volume, liquid density, vapor pressure and enthalpy of vaporization. Compared with the original equation, the modified one predicts physical properties more accurately. However, the improvement of predicting enthalpy of vaporization is marginal. The two equations are tested for predicting the phase behavior of binary asymmetric mixtures. It is shown that the difference in predicting the phase behavior is not appreciable.

Original languageEnglish
Pages (from-to)147-152
Number of pages6
JournalFluid Phase Equilibria
Issue number1
Publication statusPublished - Feb 15 2004
Externally publishedYes


  • Asymmetry
  • Equation of state
  • Hard-sphere
  • Vapor-liquid equilibria

ASJC Scopus subject areas

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

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