1,2-Dichlorotetrafluoroethane
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| UN number | 1958 |
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| Template:Longitem | C2Cl2F4 |
| Molar mass | 170.92 g/mol |
| Appearance | colorless gas[1] |
| Odor | faint, ether-like (high concentrations)[1] |
| Density | 1.455 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
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| Vapor pressure | 1.9 atm (21°C)[1] |
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1,2-Dichlorotetrafluoroethane, or R-114, also known as cryofluorane (INN), is a chlorofluorocarbon (CFC) with the molecular formula ClF2CCF2Cl. 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.[2]
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.[3]
Dangers
Aside from its immense environmental impacts, R114, like most chlorofluoroalkanes, forms phosgene gas when exposed to a naked flame.[4]
References
External links
- Material Safety Data Sheet from Honeywell International Inc., dated 22 August 2007.
- CDC - NIOSH Pocket Guide to Chemical Hazards