Chlorofluoromethane
Chemical compound
From Wikipedia, the free encyclopedia
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]
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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) |
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| ChemSpider | |||
| ECHA InfoCard | 100.008.914 | ||
| EC Number |
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| KEGG | |||
PubChem CID |
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| 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).
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Uses
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
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]