Rahul Sharma (Editor)

1,1 Difluoroethane

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Molar mass  66.05 g/mol
Density  2.7 g/cm³
Formula  C2H4F2
1,1-Difluoroethane File1Chloro11difluoroethanesvg Wikimedia Commons

Combustion of gas duster 1 1 difluoroethane c2h4f2


1,1-Difluoroethane, or DFE, is an organofluorine compound with the chemical formula C2H4F2. This colorless gas is used as a refrigerant, where it is often listed as R-152a (refrigerant-152a) or HFC-152a (hydrofluorocarbon-152a). As an alternative to chlorofluorocarbons, it has an ozone depletion potential of zero, a lower global warming potential (120) and a shorter atmospheric lifetime (1.4 years). It has recently been approved for use in automobile applications as an alternative to R-134a.

Contents

1,1-Difluoroethane httpsiytimgcomvi3wkBnhcyO3Yhqdefaultjpg

Production

1,1-Difluoroethane is produced by the mercury-catalyzed addition of hydrogen fluoride to acetylene:

HCCH + 2 HF → CH3CHF2

The intermediate in this process is vinyl fluoride, the monomeric precursor to polyvinyl fluoride.

Uses

1,1-Difluoroethane 11difluorethaan Wikipedia

In addition to serving as a refrigerant, 1,1-difluoroethane is also commonly used in gas duster (commonly thought of as "canned air") and many consumer aerosol products, especially those subject to stringent VOC requirements.

1,1-Difluoroethane 12dichloro11difluoroethane C2H2Cl2F2 ChemSynthesis

The molecular weight of difluoroethane is 66, making it useful and convenient tool for detecting vacuum leaks in GC-MS systems.

Safety

The practice of deliberately inhaling or “huffing” canned air can be fatal. It caused a fatal cardiac arrhythmia in a 42-year-old man. Several reports of fatal car crashes have been linked to drivers huffing 1,1-difluoroethane. Because of inhalant abuse, a bitterant is added to consumer canned air products.

In a DuPont study, rats were exposed to up to 25,000 ppm (67,485 mg m−3) for six hours daily, five days a week for two years. This has become the no-observed-adverse-effect level for this substance. Prolonged exposure to 1,1-difluoroethane has been linked in humans to the development of coronary disease and angina.

Though not extremely flammable in gaseous form, 1,1-difluoroethane can burn under some conditions. As such, there is also a warning label present on some gas dusters. When inverted to spray liquid, the boiling fluorocarbon aerosol is easily ignitable, producing a very large blast of flame and extremely toxic gases such as hydrogen fluoride and carbonyl fluoride as combustion products.

References

1,1-Difluoroethane Wikipedia


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