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

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]

References

  1. ^ 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 978-3-527-30673-2.
  2. ^ US EPA, OAR (22 July 2015). "Phaseout of Class II Ozone-Depleting Substances". www.epa.gov. Retrieved 29 August 2024.
  3. ^ 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.
  4. ^ 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.
Allikas: https://en.wikipedia.org/wiki/Chlorofluoromethane
No tags for this post.