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Thermodynamic properties of seven gaseous halogenated hydrocarbons from acoustic measurements: CHClFCF3, CHF2 CF3, CF3 CH3, CHF2CH3, CF3CHFCHF2, CF3CH2CF3, and CHF2CF2CH2F

International Journal of Thermophysics volume 18, pages 73–135 (1997)Cite this article

Abstract

Measurements of the speed of sound in seven halogenated hydrocarbons are presented. The compounds in this study are 1-chloro-1,2,2,2-tetrafluoroethane (CHClFCF3 or HCFC-124), pentafluoroethane (CHF2 CF3 or HFC-125), 1,1,1-trifluoroethane (CF3CH3 or HFC-143a), 1,1-difluoroethane (CHF2CH3 or HFC-152a), 1,1,1,2,3,3-hexafluoropropane (CF3CHFCHF2 or HFC-236ea), 1,1,1,3,3,3-hexafluoropropane (CF3CH2CF3 or HFC-236fa), and 1,1,2,2,3-pentafluoropropane (CHF2CF2CH2F or HFC-245ca). The measurements were performed with a cylindrical resonator at temperatures between 240 and 400 K and at pressures up to 1.0 MPa. Ideal-gas heat capacities and acoustic virial coefficients were directly deduced from the data. The ideal-gas heat capacity of HFC-125 from this work differs from spectroscopic calculations by less than 0.2% over the measurement range. The coefficients for virial equations of state were obtained from the acoustic data and hard-core square-well intermolecular potentials. Gas densities that were calculated from the virial equations of state for HCFC-124 and HFC-125 differ from independent density measurements by at most 0.15%, for the ranges of temperature and pressure over which both acoustic and Burnett data exist. The uncertainties in the derived properties for the other five compounds are comparable to those for HCFC-124 and HFC-125.

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Authors and Affiliations

  1. Physical and Chemical Properties Division, Chemical Science and Technology Laboratory, National Institute of Standards and Technology, 20899, Gaithersburg, Maryland, USA

    K. A. Gillis

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Gillis, K.A. Thermodynamic properties of seven gaseous halogenated hydrocarbons from acoustic measurements: CHClFCF3, CHF2 CF3, CF3 CH3, CHF2CH3, CF3CHFCHF2, CF3CH2CF3, and CHF2CF2CH2F. Int J Thermophys 18, 73–135 (1997). https://doi.org/10.1007/BF02575203

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  • DOI: https://doi.org/10.1007/BF02575203

Key Words

  • CHClFCF3
  • CHF2CF3
  • CF3CH3
  • CHF3CH3
  • CF3CHFCHF2
  • CF3CH2CF3
  • CHF2CF2CH2F
  • density
  • equation of state
  • heat capacity
  • refrigerants
  • speed of sound
  • thermodynamic properties
  • virial coefficient