Method for locating the vapor-liquid critical point of multicomponent fluid mixtures using a shear mode piezoelectric sensor

Jie Ke, P. J. King, Michael W. George, Martyn Poliakoff

Research output: Journal PublicationArticlepeer-review

20 Citations (Scopus)

Abstract

A new approach to locating the critical point of fluid mixtures is reported, utilizing a shear mode piezoelectric sensor. This technique employs a single piece of quartz crystal that is installed at the bottom of a strongly stirred high-pressure vessel. The sensor response indicates whether liquid or gas is in contact with its surfaces. Thus, the sensor is able to identify vapor-liquid phase separation by registering a discontinuity in the impedance minimum of the sensor as a function of pressure. Two systems (methanol + CO 2 and H2 + CO2) have been investigated using this method. The critical point data of the methanol + CO2 system were chosen to validate the approach against a wealth of literature data, and good agreement was obtained. The sensor behavior in the two-phase region, as well as the effect of stirring, is discussed. The method is general and can be used with other sensors.

Original languageEnglish
Pages (from-to)85-92
Number of pages8
JournalAnalytical Chemistry
Volume77
Issue number1
DOIs
Publication statusPublished - 1 Jan 2005
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry

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