Chlorodifluoromethane | chemical compound | Britannica (original) (raw)

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production and environment concerns

• In chloroform
  …is in the preparation of chlorodifluoromethane (HCFC-22). HCFC-22 contributes to depletion of the ozone layer, and its production is scheduled to halt by 2020 in the United States. As HCFC-22 production is phased out, chloroform production is expected to decrease significantly.
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refrigerants

• 
  In chemical industry: Refrigerants
  …used is Freon 22 (CHClF2), chlorodifluoromethane. Several analogous compounds containing carbon, fluorine, chlorine, and sometimes hydrogen are available.
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tetrafluoroethylene production

• In tetrafluoroethylene
  Tetrafluoroethylene is produced by heating chlorodifluoromethane, which is made from chloroform by its reaction with hydrogen fluoride in the presence of antimony pentachloride; chlorodifluoromethane (known by several trade names, of which the oldest is Freon 22) is used as a refrigerant in small air conditioners. Tetrafluoroethylene is flammable and, under…
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