### 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/T_{c} < 1 and in the reduced density range of 0.45 < ρ/ρ_{c} < 1.53. Taking into consideration of the disappearing level of the meniscus as well as the intensity of the critical opalescence, the critical temperature T_{c} and critical density ρ_{c} were determined. With respect to the critical pressure P_{c}, 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 T_{c} = 345.88 + δ_{T} K, δ_{T} = 0.00±0.01 K, ρ_{c} = 431 ± 3 kg m^{-3}, and P_{c} = 3764 + 78.73δ_{T} ± 5 kPa. In addition, the critical exponent β along the coexistence curve was also discussed.

Original language | English |
---|---|

Pages (from-to) | 139-147 |

Number of pages | 9 |

Journal | Fluid Phase Equilibria |

Volume | 125 |

Issue number | 1-2 |

Publication status | Published - Oct 15 1996 |

Externally published | Yes |

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### All Science Journal Classification (ASJC) codes

- Fluid Flow and Transfer Processes
- Physical and Theoretical Chemistry

### Cite this

*Fluid Phase Equilibria*,

*125*(1-2), 139-147.

**Critical parameters for 1,1,1-trifluoroethane (R-143a).** / Higashi, Yukihiro; Ikeda, Takeaki.

Research output: Contribution to journal › Article

*Fluid Phase Equilibria*, vol. 125, no. 1-2, pp. 139-147.

}

TY - JOUR

T1 - Critical parameters for 1,1,1-trifluoroethane (R-143a)

AU - Higashi, Yukihiro

AU - Ikeda, Takeaki

PY - 1996/10/15

Y1 - 1996/10/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0030262965&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030262965&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0030262965

VL - 125

SP - 139

EP - 147

JO - Fluid Phase Equilibria

JF - Fluid Phase Equilibria

SN - 0378-3812

IS - 1-2

ER -