Chlorofluoromethane
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| Names | |||
|---|---|---|---|
| Preferred IUPAC name Chloro(fluoro)methane | |||
| Other names Chlorofluoromethane Fluorochloromethane Chloro-fluoro-methane Methylene chloride fluoride Monochloromonofluoromethane CFM Khladon 31 Freon 31 HCFC 31 R 31 | |||
| Identifiers | |||
3D model (JSmol) | |||
| ChemSpider | |||
| ECHA InfoCard | 100.008.914 | ||
| EC Number |
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| KEGG | |||
PubChem CID | |||
| UNII | |||
CompTox Dashboard (EPA) | |||
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| Properties | |||
| CH2ClF | |||
| Molar mass | 68.48 g/mol | ||
| Appearance | Gas | ||
| Density | 1.271 kg/m3 at 20 °C | ||
| Melting point | −133.0 °C (−207.4 °F; 140.2 K) | ||
| Boiling point | −9.1 °C (15.6 °F; 264.0 K) | ||
Henry's law constant (kH) | 0.15 mol.kg−1.bar−1 | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards | Carc. Cat. 3 | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
Chlorofluoromethane or Freon 31 is the hydrochlorofluorocarbon (HCFC) with the formula CH2ClF. It is a colorless, odorless, flammable gas.[1] It is a class II ozone depleting substance and in accordance with the montreal protocol, its production and import were banned on 1 January 2015.[2]
Uses
[edit]Pyrolysis of a mixture of dichlorofluoromethane and chlorofluoromethane gives hexafluorobenzene:[1]
- 3 CHCl2F + 3 CH2ClF → C6F6 + 9 HCl
It was used as a refrigerant and has an ozone depletion potential of 0.02.
Additional data
[edit]Its crystal structure is monoclinic with space group P21 and lattice constants a = 6.7676, b = 4.1477, c = 5.0206 (0.10−1 nm), β = 108.205°.[3]
At an altitude of 22 km, traces of chlorofluoromethane occur (148 ppt).[4]
References
[edit]- ^ a b Dagani, M. J.; Barda, H. J.; Benya, T. J.; Sanders, D. C. "Bromine Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a04_405. ISBN 978-3527306732.
- ^ US EPA, OAR (22 July 2015). "Phaseout of Class II Ozone-Depleting Substances". www.epa.gov. Retrieved 29 August 2024.
- ^ Binbrek O. S.; Torrie B. H.; Swainson I. P. (2002). "Neutron powder-profile study of chlorofluoromethane". Acta Crystallographica C. 58 (11): 672–674. doi:10.1107/S0108270102017328. PMID 12415178. S2CID 6646254.
- ^ C. Lippens; et al. (1981). "Atmospheric nitric acid and chlorofluoromethane 11 from interferometric spectra obtained at the Observatoire du Pic du Midi". Journal of Optics. 12 (5): 331–336. Bibcode:1981JOpt...12..331L. doi:10.1088/0150-536X/12/5/007.
External links
[edit]- Thermochemical table at chemnet.ru
- Infrared Spectrum of Chlorofluoromethane
- IARC Summaries & Evaluations: Vol. 41 (1986), Vol. 71 (1999)