Vapor-liquid coexistence curves in the critical region and the critical temperatures and densities of 1,1,1,2-tetrafluoroethane (R-134a), 1,1,1-trifluoroethane (R-143a), and 1,1,1,2,3,3-hexafluoropropane (R-236ea)
- Keio Univ., Hiyoshi, Yokohama (Japan)
The vapor-liquid coexistence curves in the critical region of 1,1,1,2-tetrafluoroethane (R-134a), 1,1,1-trifluoroethane (R-143a), and 1,1,1,2,3,3-hexafluoropropane (R-236ea) were measured by a visual observation of the meniscus disappearance in an optical cell. Seventeen saturated-vapor and -liquid densities have been measured for R-134a. Thirty-five saturated-vapor and -liquid densities have been measured for R-143a. Twenty-seven saturated-vapor and -liquid densities have been measured for R-236ea. The level and location of the meniscus, as well as the intensity of the critical opalescence were considered in the determination of the critical temperature and density for each fluid. R-134a was found to have (374.083 {+-} 0.010) K and (509 {+-} 1) kg/m{sup 3}, R-143a, (345.860 {+-} 0.010) K and (434 {+-} 1) kg/m{sup 3}, and R-236ea, (412.375 {+-} 0.015) K and (568 {+-} 1) kg/m{sup 3}.
- OSTI ID:
- 378018
- Journal Information:
- Journal of Chemical and Engineering Data, Journal Name: Journal of Chemical and Engineering Data Journal Issue: 5 Vol. 41; ISSN 0021-9568; ISSN JCEAAX
- Country of Publication:
- United States
- Language:
- English
Similar Records
Vapor-liquid critical surface of ternary difluoromethane + pentafluoroethane + 1,1,1,2-tetrafluoroethane (R-32/125/134a) mixtures
Measurements of saturation densities in critical region and critical loci for binary R-32/125 and R-125/143a systems