Thermodynamic consistency of high pressure ternary mixtures containing a compressed gas and solid solutes of different complexity

José O. Valderrama, Pedro A. Robles

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

A thermodynamic consistency test applicable to high pressure binary gas-solid mixtures is extended to ternary mixtures containing a compressed gas and two solid solutes. A high pressure mixture containing carbon dioxide as solvent and two chemically similar solutes (2,3 dimethylnaphthalene and 2,6 dimethylnaphthalene) and a high pressure mixture containing carbon dioxide as solvent and two chemically different solutes (capsaicin and β-carotene), are considered in the study. Several sets of isothermal solubility data for binary and ternary mixtures are considered in the study. The Peng-Robinson equation of state with the mixing rules of Wong and Sandler have been employed for modeling the solubility of the solid in the case of binary mixtures, while the classical van der Waals mixing rules were used for modeling the ternary mixtures containing two solid solutes. Then the proposed thermodynamic consistency test has been applied. The results show that the thermodynamic test for ternary mixtures can be applied with confidence determining consistency or inconsistency of the experimental data used.

Original languageEnglish
Pages (from-to)93-102
Number of pages10
JournalFluid Phase Equilibria
Volume242
Issue number1
DOIs
StatePublished - 5 Apr 2006
Externally publishedYes

Keywords

  • Equations of state
  • Mixing rules
  • Solid-gas mixtures
  • Supercritical fluids
  • Thermodynamic consistency

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