Modeling of fluid multiphase equilibria in ternary systems of carbon dioxide as the near-critical solvent and two low-volatile solutes

A direct calculation method for critical endpoints has been developed on the basis of the algorithm for critical points from Heidemann and Khalil. Hereby, the Gibbs tangent plane criterion in the formulation of Michelsen was applied for the determination of the occurrence of an additional phase. Som...

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Bibliographic Details
Published inFluid phase equilibria Vol. 158; pp. 133 - 141
Main Authors Gauter, K., Heidemann, R.A., Peters, C.J.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.1999
Subjects
Critical state
Fluid multi-phase behavior
Method of calculation
Multi-component mixture
Critical state
Multi-component mixture
Fluid multi-phase behavior
Method of calculation
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Summary:A direct calculation method for critical endpoints has been developed on the basis of the algorithm for critical points from Heidemann and Khalil. Hereby, the Gibbs tangent plane criterion in the formulation of Michelsen was applied for the determination of the occurrence of an additional phase. Some results obtained with the Peng–Robinson equation of state for the ternary systems carbon dioxide+1-hexanol+tridecane and carbon dioxide+1-pentanol+tridecane are compared to experimental critical endpoint data. The difficulties encountered with variation of the binary interaction parameters are discussed. Qualitative agreement between the calculated and the experimental data was obtained.
ISSN:0378-3812
1879-0224
DOI:10.1016/S0378-3812(99)00122-3