Calculation of mixture critical diagrams using an equation of state based on the lattice fluid theory

S. Mattedi, F. W. Tavares, M. Castier

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Abstract

A modified form of the Hicks and Young algorithm was used with the Mattedi-Tavares-Castier lattice equation of state (MTC lattice EOS) to calculate critical points of binary mixtures that exhibit several types of critical behavior. Several qualitative aspects of the critical curves, such as maxima and minima in critical pressure, and minima in critical temperature, could be predicted using the MTC lattice EOS. These results were in agreement with experimental information available in the literature, illustrating the flexibility of the functional form of the MTC lattice EOS. We observed however that the MTC lattice EOS failed to predict maxima in pressure for two of the studied systems: ethane + ethanol and methane + n-hexane. We also observed that the agreement between the calculated and experimental critical properties was at most semi-quantitative in some examples. Despite these limitations, in many ways similar to those of other EOS in common use when applied to critical point calculations, we can conclude that the MTC lattice EOS has the ability to predict several types of critical curves of complex shape.

Original languageEnglish
Pages (from-to)771-783
Number of pages13
JournalBrazilian Journal of Chemical Engineering
Volume17
Issue number4
Publication statusPublished - 1 Dec 2000

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Keywords

  • Critical points
  • Equations of state
  • Lattices
  • Mixtures

ASJC Scopus subject areas

  • Chemical Engineering(all)

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