Difluoromethane
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Names | |||
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Systematic IUPAC name
Difluoromethane[1] | |||
Other names
Carbon fluoride hydride Methylene difluoride | |||
Identifiers | |||
3D model (JSmol) |
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Abbreviations | HFC-32 R-32 | ||
1730795 | |||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
ECHA InfoCard | 100.000.764 | ||
EC Number | 200-839-4 | ||
259463 | |||
MeSH | Difluoromethane | ||
PubChem CID |
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RTECS number | PA8537500 | ||
UNII | |||
UN number | 3252 | ||
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Properties | |||
CH2F2 | |||
Molar mass | 52.02 g·mol−1 | ||
Appearance | Colorless gas | ||
Density | 1.1 g cm−3 | ||
Melting point | −136 °C (−213 °F; 137 K) | ||
Boiling point | −52 °C (−62 °F; 221 K) | ||
log P | -0.611 | ||
Vapor pressure | 1518.92 kPa (at 21.1 °C) | ||
Hazards | |||
Safety data sheet | See: data page MSDS at Oxford University | ||
R-phrases (outdated) | R11 | ||
S-phrases (outdated) | S9, S16, S33 | ||
NFPA 704 | |||
648 °C (1,198 °F; 921 K) | |||
Supplementary data page | |||
Refractive index (n), Dielectric constant (εr), etc. | |||
Thermodynamic data |
Phase behaviour solid–liquid–gas | ||
UV, IR, NMR, MS | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
Infobox references | |||
Difluoromethane, also called HFC-32 or R-32, is an organic compound of the dihalogenoalkane variety. It has the formula of CH2F2.
Uses
Difluoromethane is a refrigerant that has zero ozone depletion potential. Difluoromethane in a zeotropic (50%/50%) m/m mixture with pentafluoroethane (R-125) is known as R-410A, a common replacement for various chlorofluorocarbons (aka Freon) in new refrigerant systems, especially for air-conditioning. The zeotropic mix of difluoromethane with pentafluoroethane (R-125) and tetrafluoroethane (R-134a) is known as R-407A through R-407E depending on the composition. Likewise the azeotropic (48.2%/51.8% m/m) mixture with chlorotrifluoromethane (R13). As a refrigerant difluoromethane is classified as A2L - slightly flammable.[2] Although it has zero ozone depletion potential, it has global warming potential 675 times that of carbon dioxide, based on a 100-year time frame.[3]
References
- ↑ "Difluoromethane - Compound Summary". The PubChem Project. USA: National Center of Biotechnological Information.
- ↑ 2009 ASHRAE Handbook
- ↑ May 2010 TEAP XXI/9 Task Force Report
External links
- Flammability Measurements of Difluoromethane in Air at 100 °C
- Difluoromethane at Gas Encyclopaedia
- IR absorption spectra