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1,2-Dichlorotetrafluoroethane

Names
Preferred IUPAC name 1,2-Dichloro-1,1,2,2-tetrafluoroethane
Other names R-114, CFC-114, halon 242, cryofluorane, Freon 114, Genetron 114, Refrigerant 114
Identifiers
CAS Number	76-14-2
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL325436
ChemSpider	6189
ECHA InfoCard	100.000.853
EC Number	200-937-7
PubChem CID	6429
RTECS number	KI1101000
UNII	6B5VVT93AR
UN number	1958
CompTox Dashboard (EPA)	DTXSID8026434
InChI InChI=1S/C2Cl2F4/c3-1(5,6)2(4,7)8Key: DDMOUSALMHHKOS-UHFFFAOYSA-N
SMILES ClC(F)(F)C(F)(F)Cl
Properties
Chemical formula	C2Cl2F4
Molar mass	170.92 g/mol
Appearance	colorless gas
Odor	faint, ether-like (high concentrations)
Density	1.455 g/cm
Melting point	−94 °C (−137 °F; 179 K)
Boiling point	3.5 °C (38.3 °F; 276.6 K)
Solubility in water	0.01%
Vapor pressure	1.9 atm (21°C)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Ozone depletor
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H420
Precautionary statements	P410+P403, P502
Flash point	nonflammable
Lethal dose or concentration (LD, LC):
LC50 (median concentration)	720,000 ppm (rat, 30 min) 700,000 ppm (mouse, 30 min) 750,000 ppm (rabbit, 30 min)
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1000 ppm (7000 mg/m)
REL (Recommended)	TWA 1000 ppm (7000 mg/m)
IDLH (Immediate danger)	15000 ppm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). N verify (what is  ?) Infobox references

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.

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

1. ^ NIOSH Pocket Guide to Chemical Hazards. "#0201". National Institute for Occupational Safety and Health (NIOSH).
2. "Dichlorotetrafluoroethane". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
3. United States Environmental Protection Agency (17 July 2015). "Ozone-Depleting Substances". Retrieved 16 May 2021.
4. Laube, Johannes C.; Mohd Hanif, Norfazrin; Martinerie, Patricia; Gallacher, Eileen; Fraser, Paul J.; Langenfelds, Ray; Brenninkmeijer, Carl A. M.; Schwander, Jakob; Witrant, Emmanuel; Wang, Jia-Lin; Ou-Yang, Chang-Feng; Gooch, Lauren J.; Reeves, Claire E.; Sturges, William T.; Oram, David E. (9 December 2016). "Tropospheric observations of CFC-114 and CFC-114a with a focus on long-term trends and emissions". Atmospheric Chemistry and Physics. 16 (23): 15347–15358. Bibcode:2016ACP....1615347L. doi:10.5194/acp-16-15347-2016.
5. "False Alarms: The Legacy of Phosgene Gas". HVAC School. 4 January 2021. Retrieved 9 May 2022.

External links

• Material Safety Data Sheet from Honeywell International Inc., dated 22 August 2007.
• CDC - NIOSH Pocket Guide to Chemical Hazards

• Chlorofluorocarbons
• Refrigerants
• Greenhouse gases
• GABAA receptor positive allosteric modulators
• Ozone-depleting chemical substances