French
Deutsch1,2-Dichloro-1,1,2-trifluoroethane
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| Names | |
|---|---|
| Preferred IUPAC name 1,2-Dichloro-1,1,2-trifluoroethane | |
| Other names R-123a | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.005.955 |
| EC Number |
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PubChem CID | |
| UNII | |
| UN number | 3163 1078 |
CompTox Dashboard (EPA) | |
| |
| |
| Properties | |
| C2HCl2F3 | |
| Molar mass | 152.93 g·mol−1 |
| Density | 1.50 |
| Melting point | −78.0 °C (−108.4 °F; 195.2 K) |
| Boiling point | 29.5 °C (85.1 °F; 302.6 K) |
| Vapor pressure | 620.01 mmHg |
Henry's law constant (kH) | 9.55×10−2 atm-cu m/mole |
Refractive index (nD) | 1.327 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
1,2-Dichloro-1,1,2-trifluoroethane is a volatile liquid chlorofluoroalkane composed of carbon, hydrogen, chlorine and fluorine, and with structural formula CClF2CHClF. It is also known as a refrigerant with the designation R-123a.[1]
Formation
[edit]1,1,2-Trichloro-1,2,2-trifluoroethane can be biotransformed in sewage sludge to 1,2-dichloro-1,1,2-trifluoroethane.[2]
Properties
[edit]The critical temperature of R-123a is 461.6 K (188.5 °C; 371.2 °F).[3] The rotation of the molecule appears to be hindered by the present of chlorine on each carbon atom, but is eased at higher temperatures.[3]
Use
[edit]Although not deliberately used, R-123a is a significant impurity in its isomer, the widely used 2,2-dichloro-1,1,1-trifluoroethane (R-123).[3]
References
[edit]- ^ Kubota, H.; Yamashita, T.; Tanaka, Y.; Makita, T. (May 1989). "Vapor pressures of new fluorocarbons". International Journal of Thermophysics. 10 (3): 629–637. Bibcode:1989IJT....10..629K. doi:10.1007/BF00507984. S2CID 122499503.
- ^ Christian Balsiger; David Werner; Christof Holliger; Patrick Höhener (10 January 2005). "Reductive dechlorination of CFCs and HCFCs under methanogenic conditions" (PDF). Archived from the original (PDF) on 15 July 2020. Retrieved 15 July 2020.
- ^ a b c Goodwin, A. R. H.; Moldover, M. R. (October 1991). "Thermophysical properties of gaseous refrigerants from speed-of-sound measurements. III. Results for 1,1-dichloro-2,2,2-trifluoroethane (CHCl2-CF3) and 1,2-dichloro-1,2,2-trifluoroethane (CHClF-CClF2)". The Journal of Chemical Physics. 95 (7): 5236–5242. Bibcode:1991JChPh..95.5236G. doi:10.1063/1.461831.
External links
[edit]- OKADA, Masaaki (2 December 1995). "代替冷媒の表面張力" [Surface Tension of Alternative Refrigerants]. Trans. of the JAR (in Japanese). 12 (2): 135–145. doi:10.11322/tjsrae.12.135.
