Critical points with the Wong-Sandler mixing rule-I. Calculations with the Van der Waals equation of state

Marcelo Castier, Stanley I. Sandler

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

This is the first of two papers in which critical point calculations in binary systems were performed utilizing cubic equations of state (EOS) combined with excess energy models using the Wong-Sandler mixing rule. In this paper, the van der Waals equation of state is combined with the NRTL model in order to investigate the influence of the model parameters on the shapes of the calculated critical phase diagrams. Due to the large number of parameters in the model, it is not possible to obtain a two-dimensional global phase diagram, however the results indicate that many different types of critical phase diagrams can be obtained from the model. Due to comparatively simple functional form of the van der Waals EOS, no attempt was made to compare the calculated critical phase diagrams with experimental data. Such a comparison is made on the second paper of this series, in which the Peng Robinson EOS is combined with the NRTL model and the resulting model is used in the computation of the critical loci of several real systems.

Original languageEnglish
Pages (from-to)3393-3399
Number of pages7
JournalChemical Engineering Science
Volume52
Issue number19
DOIs
Publication statusPublished - Oct 1997
Externally publishedYes

Fingerprint

Van Der Waals
Equations of state
Equation of State
Critical point
Phase Diagram
Phase diagrams
Model
Cubic equation
Binary System
Energy Model
Excess
Locus
Experimental Data
Series

Keywords

  • Critical phenomena
  • Equations of state
  • Excess free energy
  • Local composition
  • Mixing rules
  • Phase diagrams

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Critical points with the Wong-Sandler mixing rule-I. Calculations with the Van der Waals equation of state. / Castier, Marcelo; Sandler, Stanley I.

In: Chemical Engineering Science, Vol. 52, No. 19, 10.1997, p. 3393-3399.

Research output: Contribution to journalArticle

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