Multiphase high pressure equilibria in ternary aqueous systems

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Experimental phase equilibrium measurements for the ternary system carbon dioxide - n-butanol - water are presented at 313 and 333 K and pressures from 2 to 15 MPa. The system exhibits extensive three-phase equilibrium regions. Equilibrium between four fluid phases was observed at 313 K and 8.25 MPa total pressure. A new density-dependent mixing rule with a cubic equation of state is proposed for modelling the experimental results. The model reproduces quantitatively many features of the experimentally observed behavior.

Original languageEnglish (US)
Pages (from-to)525-534
Number of pages10
JournalFluid Phase Equilibria
Issue numberC
StatePublished - Oct 1986

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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