Dichlorodifluoromethane


Dichlorodifluoromethane
Dichlorodifluoromethane
Identifiers
CAS number 75-71-8 YesY
PubChem 6391
ChemSpider 6151 YesY
UNII OFM06SG1KO YesY
EC number 200-893-9
UN number 1028
KEGG D03789 YesY
RTECS number PA8200000
Jmol-3D images Image 1
Properties
Molecular formula CCl2F2
Molar mass 120.91 g mol−1
Appearance Colorless gas with ether-like odor
Density 1.486 g/cm³ (−29.8 °C)
Melting point

-157.7 °C, 115 K, -252 °F

Boiling point

-29.8 °C, 243 K, -22 °F

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 External MSDS
EU Index Not listed
Main hazards Damaging to Earth's protective ozone
Flash point Non-flammable
Supplementary data page
Structure and
properties
n, εr, etc.
Thermodynamic
data
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Dichlorodifluoromethane (R-12), is a colorless gas, and 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

Use 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.[2]

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, a R-409A blend (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-pressure side of the system at 12 pounds per square inch (psi), while R-12 usually runs on the low side at 10 psi. 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 complications associated with mixing them.

Gallery

References

External links


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Look at other dictionaries:

  • Dichlorodifluoromethane — Dichlorodifluorométhane Dichlorodifluorométhane …   Wikipédia en Français

  • Dichlorodifluorométhane — représentation du Dichlorodifluoromét …   Wikipédia en Français

  • dichlorodifluoromethane — noun Date: 1936 a chlorofluoromethane CCl2F2 …   New Collegiate Dictionary

  • dichlorodifluoromethane — /duy klawr oh duy floor oh meth ayn, flawr ; duy klohr oh duy floor oh meth ayn; flohr /, n. Chem. a colorless, slightly water soluble, nonflammable gas, CCl2F2, that boils at 29°C: used chiefly as a propellant in aerosols and as a refrigerant.… …   Universalium

  • dichlorodifluoromethane — noun A chlorofluorocarbon halomethane formerly used as a refrigerant and aerosol spray propellant, now banned in many countries because of its effects on the ozone layer …   Wiktionary

  • dichlorodifluoromethane — An easily liquefiable gas used as a refrigerant and aerosol propellant. * * * di·chlo·ro·di·flu·o·ro·meth·ane .dī .flu̇r ə meth .ān n a nontoxic nonflammable gas CCl2F2 used as a refrigerant and as a propellant * * *… …   Medical dictionary

  • dichlorodifluoromethane — n. gas used as a propellant in aerosols and as a refrigerant …   English contemporary dictionary

  • dichlorodifluoromethane — di·chlo·ro·di·flu·o·ro·methane …   English syllables

  • dichlorodifluoromethane — /daɪˌklɔroʊdaɪˌflʊəroʊˈmiθeɪn/ (say duy.klawrohduy.floouhroh meethayn) noun a colourless, nonflammable gas, CCl2F2, used as a refrigerant, and as a propellant in aerosols and fire extinguishers. {di 1 + chlor 2 + o + di 1 + fluor 1 + …   Australian English dictionary

  • dichlorodifluoromethane — The chemical substance (CCl2F2) used in automotive air conditioning systems to absorb, carry, and release heat. A member of the fluorocarbon family. Usually referred to as refrigerant or R 12 …   Dictionary of automotive terms


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