Critical parameters for 1,1,1-trifluoroethane (R-143a)

Yukihiro Higashi, Takeaki Ikeda

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Abstract

Measurements of the vapor-liquid coexistence curve near the critical point were carried out for 1,1,1-trifluoroethane (R-143a) in the reduced temperature range of 0.97 < T/Tc < 1 and in the reduced density range of 0.45 < ρ/ρc < 1.53. Taking into consideration of the disappearing level of the meniscus as well as the intensity of the critical opalescence, the critical temperature Tc and critical density ρc were determined. With respect to the critical pressure Pc, we calculated the value from the new vapor-pressure equation made by ourselves in order to represent the behavior of vapor-pressures near the critical point. The critical parameters determined in this paper are Tc = 345.88 + δT K, δT = 0.00±0.01 K, ρc = 431 ± 3 kg m-3, and Pc = 3764 + 78.73δT ± 5 kPa. In addition, the critical exponent β along the coexistence curve was also discussed.

Original languageEnglish
Pages (from-to)139-147
Number of pages9
JournalFluid Phase Equilibria
Volume125
Issue number1-2
Publication statusPublished - Oct 15 1996
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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