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Difluoromethane

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Difluoromethane
Stereo skeletal formula of difluoromethane with all explicit hydrogens added
Stereo skeletal formula of difluoromethane with all explicit hydrogens added
Spacefill model of difluoromethane
Spacefill model of difluoromethane
Names
Systematic IUPAC name
Difluoromethane[1]
Other names
Carbon fluoride hydride

Methylene difluoride
Methylene fluoride

Freon-32
Identifiers
3D model (JSmol)
Abbreviations HFC-32

R-32
FC-32

1730795
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.000.764 Edit this at Wikidata
EC Number
  • 200-839-4
259463
MeSH Difluoromethane
RTECS number
  • PA8537500
UNII
UN number 3252
  • InChI=1S/CH2F2/c2-1-3/h1H2 checkY
    Key: RWRIWBAIICGTTQ-UHFFFAOYSA-N checkY
  • InChI=1/CH2F2/c2-1-3/h1H2
    Key: RWRIWBAIICGTTQ-UHFFFAOYAC
  • FCF
Properties
CH2F2
Molar mass 52.024 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
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propaneInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
1
4
1
648 °C (1,198 °F; 921 K)
Safety data sheet (SDS) MSDS at Oxford University
Supplementary data page
Difluoromethane (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

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

  1. ^ "Difluoromethane - Compound Summary". The PubChem Project. USA: National Center of Biotechnological Information.
  2. ^ 2009 ASHRAE Handbook
  3. ^ May 2010 TEAP XXI/9 Task Force Report
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