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Difluoroethane
Difluoroethane may refer to: * 1,1-Difluoroethane * 1,2-Difluoroethane See also * Difluoroethene * Dichloroethane Dichloroethane can refer to either of two isomeric organochlorides with the molecular formula C2H4Cl2: * 1,1-Dichloroethane (ethylidene chloride) * 1,2-Dichloroethane (ethylene dichloride) See also *Dichloroethene *Difluoroethane Difluoroethane m ... {{Short pages monitor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1,1-Difluoroethane
1,1-Difluoroethane, or DFE, is an organofluorine compound with the chemical formula CHF. This colorless gas is used as a refrigerant, where it is often listed as R-152a (refrigerant-152a) or HFC-152a (hydrofluorocarbon-152a). It is also used as a propellant for aerosol sprays and in gas duster products. As an alternative to chlorofluorocarbons, it has an ozone depletion potential of zero, a lower global warming potential (124) and a shorter atmospheric lifetime (1.4 years). Production 1,1-Difluoroethane is a synthetic substance that is produced by the mercury-catalyzed addition of hydrogen fluoride to acetylene: :HCCH + 2 HF → CHCHF The intermediate in this process is vinyl fluoride (C2H3F), the monomeric precursor to polyvinyl fluoride. Uses With a relatively low global warming potential (GWP) index of 124 and favorable thermophysical properties, 1,1-difluoroethane has been proposed as an environmentally friendly alternative to R134a. Despite its flammability, R152a also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1,2-Difluoroethane
1,2-Difluoroethane is a saturated hydrofluorocarbon containing an atom of fluorine attached to each of two carbons atoms. The formula can be written CH2FCH2F. It is an isomer of 1,1-difluoroethane. It has a HFC name of HFC-152 with no letter suffix. When cooled to cryogenic temperatures it can have different conformers, gauche and trans. In the liquid form these are about equally abundant and easily interconvert. As a gas it is mostly the gauche form. In the HFC-152 designation, 2 means two fluorine atoms, 5 means 5-1 or four hydrogen atoms, and 1 means 1+1 or two carbon atoms. Formation Ethylene reacts explosively with fluorine yielding a mixture of 1,2-difluoroethane and vinyl fluoride. With solid fluorine it will react when triggered by near-infrared radiation. Properties Critical temperature is 107.5 °C. If a C-H bond is over excited with too much vibration, the intramolecular vibrational relaxation takes 490 picoseconds. The F-C-C-F dihedral angle is about 72 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Difluoroethene
Difluoroethene or Difluoroethylene can refer to any one of several isomeric forms of the organochloride with the molecular formula C2H2F2: There are three isomers: * 1,1-Difluoroethene * 1,2-Difluoroethene (''E'' and ''Z'') See also *Difluoroethane *Dichloroethene Dichloroethene or dichloroethylene, often abbreviated as DCE, can refer to any one of several isomeric forms of the organochloride with the molecular formula C2H2Cl2: There are three isomers: * 1,1-Dichloroethene *1,2-Dichloroethene (''E'' and ''Z' ... {{Chemistry index Organofluorides Haloalkenes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |