Determining phase boundaries and vapour/liquid critical points in supercritical fluids: A multi-technique approach

Robert M. Oag, Peter J. King, Christopher J. Mellor, Michael W. George, Jie Ke, Martyn Poliakoff, Vladimir K. Popov, Viktor N. Bagratashvili

Research output: Journal PublicationArticlepeer-review

23 Citations (Scopus)

Abstract

We describe an apparatus used to make precise determinations of the coexistence regimes and critical points of single, binary, and multi-component fluids. The design allows semi-automated measurements to be made over a pressure range of 1-300 bar and a temperature range of-20 to +120°C with a stability of ±2 mK. We describe the use of the apparatus in determining the critical points and phase boundaries of single component and binary mixtures through a number of optical, acoustic, and shear-mode piezoelectric sensor methods. We conclude that the accurate determination of bubble-point lines, dew-point lines and critical points is best achieved by making measurement using a number of complementary techniques.

Original languageEnglish
Pages (from-to)259-272
Number of pages14
JournalJournal of Supercritical Fluids
Volume30
Issue number3
DOIs
Publication statusPublished - Aug 2004
Externally publishedYes

Keywords

  • Phase boundaries
  • Sound velocity
  • Supercritical
  • Viscosity

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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