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Dichlorodifluoromethane IUPAC name Dichlorodifluoromethane Other names Carbon dichloride difluoride, Dichloro-difluoro-methane, Difluorodichloromethane, Freon 12, R-12, CFC-12, P-12, Propellant 12, Halon 122, Arcton 6, Arcton 12, E940 Identifiers CAS number 75-71-8 Y PubChem 6391 ChemSpider 6151 Y UNII OFM06SG1KO Y EC number 200-893-9 UN number 1028 KEGG D03789 Y RTECS number PA8200000 Jmol-3D images Image 1 SMILES ClC(Cl)(F)F InChI InChI=1S/CCl2F2/c2-1(3,4)5 Y Key: PXBRQCKWGAHEHS-UHFFFAOYSA-N Y InChI=1/CCl2F2/c2-1(3,4)5 Key: PXBRQCKWGAHEHS-UHFFFAOYAX Properties Molecular formula CCl2F2 Molar mass 120.91 g/mol Appearance Colorless gas with ether-like odor Density 1.486 g/cm³ (−29.8 °C) Melting point −157.7 °C (115.5 K) Boiling point −29.8 °C (243.3 K) Solubility in water 0.286 g/l at 20 °C log P 2.16 Vapor pressure 568 kPa (20 °C) kH 0.0025 mol kg-1 bar-1 Hazards MSDS ICSC 0048 EU Index Not listed Main hazards Damaging to Earth's protective ozone Flash point Non-flammable  Y(what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references Dichlorodifluoromethane (R-12), usually sold under the brand name Freon-12, is a chlorofluorocarbon halomethane (CFC), used as a refrigerant and aerosol spray propellant. Complying with the Montreal Protocol, its manufacture was banned in the United States along with many other countries in 1994 due to concerns about damage to the ozone layer.[1] It is soluble in many organic solvents. Contents 1 Physical properties 2 Usage as an aerosol 3 Retrofitting 4 Product use 5 Gallery 6 External links 7 References Physical properties Property Value Density (ρ) at -29.8 °C (gas) 6.25 kg.m-3 Density (ρ) at 15 °C (gas) 5.11 kg.m-3 Triple point temperature (Tt) -157 °C (116 K) Triple point pressure (pt) 10 Pa (0.00010 bar) Critical temperature (Tc) 112 °C (385 K) Critical pressure (pc) 4.170 MPa (41.15 bar) Critical density (ρc) 4.789 mol.l-1 Latent heat of vaporization (lv) 166.95 Specific heat capacity at constant pressure (Cp) at 30 °C 74 J.mol-1.K-1 Specific heat capacity at constant volume (Cv) at 30 °C 65 J.mol-1.K-1 Heat capacity ratio (κ) at 30 °C 1.138889 Vapor pressure (η) at -20 °C 151 kPa Vapor pressure (η) at 0 °C 300 kPa Vapor pressure (η) at 16 °C 500 kPa Vapor pressure (η) at 20 °C 567 kPa Vapor pressure (η) at 40 °C 960 kPa Compressibility Factor (Z) at 21 °C 0.995 Viscosity (μ) at 0 °C 11.68 μPa.s (0.01168 cP) Thermal conductivity (k) at 0 °C 9.46 mW.m-1.K-1 Ozone depletion potential (ODP) 1.0 (CCl3F = 1) Global warming potential (GWP) 8100 (CO2 = 1) Usage as an aerosol The use of chlorofluorocarbons as an aerosol in medicine, for example: USP-approved salbutamol, has been phased out by the U.S. Food and Drug Administration. The use of a different propellant known as hydrofluoroalkane, or HFA, which does not harm the environment has been chosen as the replacement. [1] Retrofitting R-12 was used in most refrigeration and vehicle air conditioning applications prior to 1994 before being replaced by R-134a, which has a lower ozone depletion potential. When older units leak, retrofits to (1,1,1,2-tetrafluoroethane) are recommended. Retrofits to R-134a require complete flushing and filter/dryer replacement to remove the mineral oil. Mineral oil used for R12 is not compatible with R-134a. Some oils designed for conversion to R-134a are advertised as compatible with residual R-12. New rubber hoses which are R-134a compatible may be needed for the same reason. In systems where R-134a is not practical, R-409A (60% R-22; 25% R-124; 15% R-142b) may be directly added to an R-12 system without oil change although a filter change is always recommended. R-409A usually runs on the low side of 12 p.s.i. while R-12 usually runs on the low side of 10 p.s.i. R-409A runs at higher pressures and is less efficient but works quite well. Manufacturer recommends that existing R-12 charge should be recovered. However, as the two refrigerants are soluble in the same mineral oil there are no complictions associated with mixing them. Product use The following products use Dichlorodiflouromethane: Fluori-Methane Gallery Hemispheric and global mean CFC-12 concentrations (NOAA/ESRL) Time-series of atmospheric concentrations of CFC-12 (Walker et al., 2000) "Present day" (1990s) sea surface CFC-12 concentration "Present day" (1990s) CFC-12 oceanic vertical inventory External links NOAA/ESRL CFC-12 global measurements International Chemical Safety Card 0048 Overview of Freon-12 and some of its environmental problems MSDS at Oxford University Thermochemistry data at IR absorption spectra v · d · eE numbers Colors (E100–199) · Preservatives (E200–299) · Antioxidants & acidity regulators (E300–399) · Thickeners, stabilisers & emulsifiers (E400–499) · pH regulators & anti-caking agents (E500–599) · Flavour enhancers (E600–699) · Miscellaneous (E900–999) · Additional chemicals (E1100–1599) Waxes (E900–909) · Synthetic glazes (E910–919) · Improving agents (E920–929) · Packaging gases (E930–949) · Sweeteners (E950–969) · Foaming agents (E990–999) Calcium peroxide (E930) · Argon (E938) · Helium (E939) · Dichlorodifluoromethane (E940) · Nitrogen (E941) · Nitrous oxide (E942) · Butane (E943a) · Isobutane (E943b) · Propane (E944) · Oxygen (E948) · Hydrogen (E949) v · d · eHalomethanes Monosubstituted CH3F · CH3Cl · CH3Br · CH3I Disubstituted CH2F2 · CH2ClF · CH2BrF · CH2FI · CH2Cl2 · CH2BrCl · CH2ClI · CH2Br2 · CH2BrI · CH2I2 Trisubstituted CHF3 · CHClF2 · CHBrF2 · CHF2I · CHCl2F · C*HBrClF · C*HClFI · CHBr2F · C*HBrFI · CHFI2 · CHCl3 · CHBrCl2 · CHCl2I · CHBr2Cl · C*HBrClI · CHClI2 · CHBr3 · CHBr2I · CHBrI2 · CHI3 Tetrasubstituted CF4 · CClF3 · CBrF3 · CF3I · CCl2F2 · CBrClF2 · CClF2I · CBr2F2 · CBrF2I · CF2I2 · CCl3F · CBrCl2F · CCl2FI · CBr2ClF · C*BrClFI · CClFI2 · CBr3F · CBr2FI · CBrFI2 · CFI3 · CCl4 · CBrCl3 · CCl3I · CBr2Cl2 · CBrCl2I · CCl2I2 · CBr3Cl · CBr2ClI · CBrClI2 · CClI3 · CBr4 · CBr3I · CBr2I2 · CBrI3 · CI4 * Chiral compound. References ^ The Ozone Hole-The Montreal Protocol on Substances that Deplete the Ozone Layer