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

doi:10.1016/j.supflu.2003.09.021

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 Publication › Article › peer-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 language	English
Pages (from-to)	259-272
Number of pages	14
Journal	Journal of Supercritical Fluids
Volume	30
Issue number	3
DOIs	https://doi.org/10.1016/j.supflu.2003.09.021
Publication status	Published - Aug 2004
Externally published	Yes

Keywords

Phase boundaries
Sound velocity
Supercritical
Viscosity

ASJC Scopus subject areas

General Chemical Engineering
Condensed Matter Physics
Physical and Theoretical Chemistry

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10.1016/j.supflu.2003.09.021

Cite this

@article{e2b73a59fa5c4bbb80ff210c681bd219,

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

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.",

keywords = "Phase boundaries, Sound velocity, Supercritical, Viscosity",

author = "Oag, {Robert M.} and King, {Peter J.} and Mellor, {Christopher J.} and George, {Michael W.} and Jie Ke and Martyn Poliakoff and Popov, {Vladimir K.} and Bagratashvili, {Viktor N.}",

note = "Funding Information: We are grateful to the EPRSC (GR/R02863) and to the Paul Instrument Fund of the Royal Society of London for financial support throughout this project. We are also indebted to the staff of the electronics, and engineering workshops at the School of Physics and Astronomy, for the prompt design and construction of many of the apparatus components. We also thank Mr. K. Stanley, of the School of Chemistry engineering workshop, for the construction of the pressure cell and piston. ",

year = "2004",

month = aug,

doi = "10.1016/j.supflu.2003.09.021",

language = "English",

volume = "30",

pages = "259--272",

journal = "Journal of Supercritical Fluids",

issn = "0896-8446",

publisher = "Elsevier B.V.",

number = "3",

}

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T2 - A multi-technique approach

AU - Oag, Robert M.

AU - King, Peter J.

AU - Mellor, Christopher J.

AU - George, Michael W.

AU - Ke, Jie

AU - Poliakoff, Martyn

AU - Popov, Vladimir K.

AU - Bagratashvili, Viktor N.

N1 - Funding Information: We are grateful to the EPRSC (GR/R02863) and to the Paul Instrument Fund of the Royal Society of London for financial support throughout this project. We are also indebted to the staff of the electronics, and engineering workshops at the School of Physics and Astronomy, for the prompt design and construction of many of the apparatus components. We also thank Mr. K. Stanley, of the School of Chemistry engineering workshop, for the construction of the pressure cell and piston.

PY - 2004/8

Y1 - 2004/8

N2 - 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.

AB - 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.

KW - Phase boundaries

KW - Sound velocity

KW - Supercritical

KW - Viscosity

UR - http://www.scopus.com/inward/record.url?scp=3242721404&partnerID=8YFLogxK

U2 - 10.1016/j.supflu.2003.09.021

DO - 10.1016/j.supflu.2003.09.021

M3 - Article

AN - SCOPUS:3242721404

SN - 0896-8446

VL - 30

SP - 259

EP - 272

JO - Journal of Supercritical Fluids

JF - Journal of Supercritical Fluids

IS - 3

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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