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Isothermal Vapor–Liquid Equilibrium Data for Binary Systems of CHF3 or C2F6 with Methylcyclohexane or Toluene

  • Mark D. Williams-Wynn*
    Mark D. Williams-Wynn
    Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, Durban, 4041, South Africa
    *E-mail: [email protected]. Phone: +27 31 2602938. Fax: +27 31 2601118.
  • Paramespri Naidoo
    Paramespri Naidoo
    Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, Durban, 4041, South Africa
  • , and 
  • Deresh Ramjugernath
    Deresh Ramjugernath
    Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, Durban, 4041, South Africa
Cite this: J. Chem. Eng. Data 2018, 63, 6, 2114–2126
Publication Date (Web):May 9, 2018
https://doi.org/10.1021/acs.jced.8b00123
Copyright © 2018 American Chemical Society

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    Abstract

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    The isothermal vapor–liquid and vapor–liquid–liquid equilibria of four binary refrigerant–hydrocarbon systems were measured using a static-analytic apparatus at temperatures between 293.0 and 313.2 K and at pressures of up to 6.1 MPa. The two refrigerants that were investigated were trifluoromethane and hexafluoroethane, and the hydrocarbons were methylcyclohexane and toluene. At the temperatures that were investigated, the R-23 + toluene system alone did not exhibit any liquid–liquid immiscibility. The “bird’s-beak” phenomenon was observed for all of the systems. The experimental data were regressed with the PR MC EOS with the WS mixing rule. Either the NRTL or the UNIQUAC activity coefficient model was used within the WS mixing rule. A procedure for the calculation of the critical locus curves from thermodynamic models and an extrapolation technique for determining the mixture critical points from subcritical coexistence curves were employed. The van Konynenburg and Scott classifications of the four binary systems were discussed.

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    Cited By

    This article is cited by 1 publications.

    1. R. Beckmüller, R. Span, E. W. Lemmon, M. Thol. A Fundamental Equation of State for the Calculation of Thermodynamic Properties of n -Octane. Journal of Physical and Chemical Reference Data 2022, 51 (4) https://doi.org/10.1063/5.0104661

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