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1,2-Dichlorotetrafluoroethane

Chlorofluorocarbon

Chlorofluorocarbon

700,000 ppm (mouse, 30 min) 750,000 ppm (rabbit, 30 min)

1,2-Dichlorotetrafluoroethane, or R-114, also known as cryofluorane (INN), is a chlorofluorocarbon (CFC) with the molecular formula ClFCCFCl. Its primary use has been as a refrigerant. It is a non-flammable gas with a sweetish, chloroform-like odor with the critical point occurring at 145.6 °C and 3.26 MPa. When pressurized or cooled, it is a colorless liquid. It is listed on the Intergovernmental Panel on Climate Change's list of ozone depleting chemicals, and is classified as a Montreal Protocol Class I, group 1 ozone depleting substance.

Uses

When used as a refrigerant, R-114 is classified as a medium pressure refrigerant.

The U.S. Navy uses R-114 in its centrifugal chillers in preference to R-11 to avoid air and moisture leakage into the system. While the evaporator of an R-11 charged chiller runs at a vacuum during operation, R-114 yields approximately 0 psig operating pressure in the evaporator.

Manufactured and sold R-114 was usually mixed with the non symmetrical isomer 1,1-dichlorotetrafluoroethane (CFC-114a), as separation of the two isomers is difficult.

Dangers

Aside from its immense environmental impacts, R114, like most chlorofluoroalkanes, forms phosgene gas when exposed to a naked flame.

References

References

  1. {{PGCH. 0201
  2. {{IDLH. 76142. Dichlorotetrafluoroethane
  3. (17 July 2015). "Ozone-Depleting Substances".
  4. (9 December 2016). "Tropospheric observations of CFC-114 and CFC-114a with a focus on long-term trends and emissions". Atmospheric Chemistry and Physics.
  5. (4 January 2021). "False Alarms: The Legacy of Phosgene Gas".
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chlorofluorocarbons refrigerants greenhouse-gases gabaa-receptor-positive-allosteric-modulators ozone-depleting-chemical-substances chlorofluoroalkanes
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