Design of a high-pressure ebulliometer, with vapor-liquid equilibrium results for the systems CHF{sub 2}Cl + CF{sub 3}-CH{sub 3} and CF{sub 3}-CH{sub 2} F+CH{sub 2}F{sub 2}

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF01439194· OSTI ID:376930

Weber, L A; Silva, A M ^[1]

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1. National Inst. of Standards and Technology, Gaithersburg, MD (United States)

The authors describe the design and operation of a new high-pressure metal ebulliometer which can operate at pressures to at least 3 MPa in the range 220-400 K. Infinite-dilution activity coefficients are presented for the system CHF{sub 2}Cl + CF{sub 3}-CH{sub 3} at 275 K and for the system CF{sub 3}-CH{sub 2}F + CH{sub 2}F{sub 2} at 260, 280, and 300 K. The Wilson activity coefficient model and a virial coefficient model are applied to these systems, and the phase equilibrium conditions are calculated. The results are shown to agree well with predicted and with published measured values. The excess enthalpy is calculated and compared with results from a Peng-Robinson equation of state. Vapor densities on the dew curves are given.

• Sponsoring Organization: USDOE
• OSTI ID: 376930
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 4 Vol. 17; ISSN 0195-928X; ISSN IJTHDY
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BOILING POINTS
DESIGN
MEASURING INSTRUMENTS
MIXTURES
ORGANIC FLUORINE COMPOUNDS
REFRIGERANTS
TEMPERATURE RANGE 0065-0273 K