Chlorodifluoromethane

Jump to: navigation, search
Template:Chembox ECNumberTemplate:Chembox E numberTemplate:Chembox SolubilityInWater
Chlorodifluoromethane
IUPAC name Chlorodifluoromethane
Other names Difluoromonochloromethane, Monochlorodifluoromethane, HCFC-22, R-22, Genetron 22, Freon 22, Red Gas, Arcton 4, Arcton 22, UN 1018
Identifiers
3D model (JSmol)
ECHA InfoCard Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value). Lua error in Module:Wikidata at line 879: attempt to index field 'wikibase' (a nil value).
KEGG
RTECS number PA6390000
Properties
CHClF2
Molar mass 86.47 g/mol
Appearance Colorless gas
Density 3.66 kg/m3 at 15°C, gas
Melting point
Boiling point
log P 1.08
Vapor pressure 908 kPa at 20 °C
kH 0.033 mol.kg-1.bar-1
Structure
Molecular shape Tetrahedral
Hazards
Main hazards Dangerous for the environment (N), Central nervous system depressant, Carc. Cat. 3
R-phrases R59
S-phrases S23, S24, S25, S59
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

WikiDoc Resources for Chlorodifluoromethane

Articles

Most recent articles on Chlorodifluoromethane

Most cited articles on Chlorodifluoromethane

Review articles on Chlorodifluoromethane

Articles on Chlorodifluoromethane in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Chlorodifluoromethane

Images of Chlorodifluoromethane

Photos of Chlorodifluoromethane

Podcasts & MP3s on Chlorodifluoromethane

Videos on Chlorodifluoromethane

Evidence Based Medicine

Cochrane Collaboration on Chlorodifluoromethane

Bandolier on Chlorodifluoromethane

TRIP on Chlorodifluoromethane

Clinical Trials

Ongoing Trials on Chlorodifluoromethane at Clinical Trials.gov

Trial results on Chlorodifluoromethane

Clinical Trials on Chlorodifluoromethane at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Chlorodifluoromethane

NICE Guidance on Chlorodifluoromethane

NHS PRODIGY Guidance

FDA on Chlorodifluoromethane

CDC on Chlorodifluoromethane

Books

Books on Chlorodifluoromethane

News

Chlorodifluoromethane in the news

Be alerted to news on Chlorodifluoromethane

News trends on Chlorodifluoromethane

Commentary

Blogs on Chlorodifluoromethane

Definitions

Definitions of Chlorodifluoromethane

Patient Resources / Community

Patient resources on Chlorodifluoromethane

Discussion groups on Chlorodifluoromethane

Patient Handouts on Chlorodifluoromethane

Directions to Hospitals Treating Chlorodifluoromethane

Risk calculators and risk factors for Chlorodifluoromethane

Healthcare Provider Resources

Symptoms of Chlorodifluoromethane

Causes & Risk Factors for Chlorodifluoromethane

Diagnostic studies for Chlorodifluoromethane

Treatment of Chlorodifluoromethane

Continuing Medical Education (CME)

CME Programs on Chlorodifluoromethane

International

Chlorodifluoromethane en Espanol

Chlorodifluoromethane en Francais

Business

Chlorodifluoromethane in the Marketplace

Patents on Chlorodifluoromethane

Experimental / Informatics

List of terms related to Chlorodifluoromethane


Overview

Chlorodifluoromethane or difluoromonochloromethane is a hydrochlorofluorocarbon (HCFC). It is better known under its code names of HCFC-22, R-22, Genetron 22 or Freon 22, and is commonly used in air conditioning applications, such as residential split systems in the US, rooftop units and window air conditioners.

Chlorodifluoromethane was first used as an alternative to the ozone depleting CFC-11 and CFC-12, but was later decided to be not environmentally friendly enough, although its ozone depletion potential is 0.055,[1] among the lowest for chlorine-containing haloalkanes. It will be phased out soon under the Montreal Protocol, to be replaced by more environmentally friendly refrigerants such as Propane (R-290), and other refrigerants ( even though not having very similar properties ): R-410A (an azeotropic mixture of difluoromethane and pentafluoroethane), R-502, R-134a (1,1,1,2-tetrafluroethane) and R-409A.

It is an intermediate in the synthesis of tetrafluoroethylene, into which it is converted by pyrolysis. Difluorocarbene is an intermediate in this reaction. The compound also yields difluorocarbene upon treatment with strong base and is used in the laboratory as a source of this reactive intermediate.

The US EPA has enacted regulation which will phase out the use of HCFC-22 in the near future. Air conditioning manufacturers will no longer be allowed to sell R22 equipment as of January 1, 2010. In the aftermarket service business, the allocation rights for producers who manufacture R22 will be cut each year making the remaining R22 supply potentially smaller than the service demand for the product. This could make R22 scarce in the future, and drive prices to consumers higher.

Physical Properties

Property Value
Density (ρ) at -69 °C (liquid) 1.49 g.cm-3
Density (ρ) at -41 °C (liquid) 1.413 g.cm-3
Density (ρ) at -41 °C (gas) 4.706 kg.m-3
Density (ρ) at 15 °C (gas) 3.66 kg.m-3
Specific gravity at 21 °C (gas) 3.08 (air = 1)
Specific volume (ν) at 21 °C (gas) 0.275 m³.kg-1
Density (ρ) at 15 °C (gas) 3.66 kg.m-3
Triple point temperature (Tt) -157.39 °C (115.76 K)
Critical temperature (Tc) 96.2 °C (369.3 K)
Critical pressure (pc) 4.936 MPa (49.36 bar)
Critical density (ρc) 6.1 mol.l-1
Latent heat of vaporization (lv) at boiling point (-40.7 °C) 233.95 kJ.kg-1
Heat capacity at constant pressure (Cp) at 30 °C (86 °F) 0.057 kJ.mol-1.K-1
Heat capacity at constant volume (Cv) at 30 °C (86 °F) 0.048 kJ.mol-1.K-1
Heat capacity ratio (γ) at 30 °C (86 °F) 1.178253
Compressibility factor (Z) at 15 °C 0.9831
Acentric factor (ω) 0.22082
Dipole moment 1.458 D
Viscosity (η) at 0 °C 12.56 µPa.s (0.1256 cP)
Ozone depletion potential (ODP) 0.055 (CCl3F = 1)
Global warming potential (GWP) 1900 (CO2 = 1)

It has two allotropes: crystaline II below 59 K and crystaline I above 59 K to 115.73 K.

See also

External links

References

  1. The Montreal Protocol on Substances that Deplete the Ozone Layer. UNEP, 2000. ISBN 92-807-1888-6

de:Chlordifluormethan



Linked-in.jpg