Liquid-liquid equilibria with an equation of state based on the significant structure model

Gracia M. Acosta, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Liquid-liquid equilibrium data for class II + class V, class I + class II, and class I + class V mixtures were correlated with a recently proposed equation of state (EOS) and local composition mixing rules. It was found the Suzuki EOS with the local composition mixing rules was successful in correlating liquid-liquid equilibrium data for mixtures of an alcohol and shorter chain hydrocarbons (class II + class V) with two interaction parameters, kij and lij, which correct the interaction energy and the local composition terms. However, for alcohol and long chain hydrocarbon mixtures, we found that only qualitative agreement was possible for the more polar phase. This can be explained in terms of the dielectric constants of the pure components. For class I + class II mixtures and class I + class V mixtures, the local composition mixing rules gave fair agreement with the data. Correlation of the data with random mixing rules is also shown for comparison along with the Soave EOS equation. It was found that both the Soave EOS and Suzuki EOS produced similar results with random mixing rules and that the liquid density had little effect on the calculations.

Original languageEnglish
Pages (from-to)29-41
Number of pages13
JournalFluid Phase Equilibria
Issue numberC
Publication statusPublished - 1994 Jun 15
Externally publishedYes


  • application
  • equation of state
  • liquid-liquid equilibria
  • local composition
  • mixtures
  • non-polar
  • polar
  • theory

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Liquid-liquid equilibria with an equation of state based on the significant structure model'. Together they form a unique fingerprint.

Cite this