Dichlorofluoromethane

Dichlorofluoromethane
Names
Preferred IUPAC name
Dichloro(fluoro)methane
Other names
Dichlorofluoromethane
Fluorodichloromethane
Monofluorodichloromethane
Dichloromonofluoromethane
Freon 21
Refrigerant 21
R 21
HCFC 21
Algofrene Type 5
Arcton 7
Halon 112
UN 1029
Genetron 21
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.000.791
EC Number 200-869-8
RTECS number PA8400000
UNII
Properties
CHCl2F
Molar mass 102.92 g/mol
Appearance Colorless gas
Odor ether-like[1]
Density 1.405 g/cm3 at 9 °C

1.366 kg/m3 at 25 °C

Melting point −135 °C (−211 °F; 138 K)
Boiling point 8.92 °C (48.06 °F; 282.07 K)
9.420 g/l at 30 °C
log P 1.55
Vapor pressure 160 kPa
0.19 mol.kg−1.bar−1
-48.8·10−6 cm3/mol
Hazards
Main hazards Dangerous for the environment (N)
R-phrases (outdated) R59
S-phrases (outdated) S59
Flash point nonflammable [1]
522 °C (972 °F; 795 K)
Lethal dose or concentration (LD, LC):
>800,000 mg/m3 (mouse, 2 hr)
49,900 ppm (rat, 4 hr)[2]
100,000 ppm (guinea pig, <1 hr)
100,000 ppm (mouse, <1 hr)[2]
US health exposure limits (NIOSH):
PEL (Permissible)
 TWA 1000 ppm (4200 mg/m3)[1]
REL (Recommended)
 TWA 10 ppm (40 mg/m3)[1]
IDLH (Immediate danger)
 5000 ppm[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon. It is a colorless and odorless gas.

Its critical point is at 178.5 °C (451.7 K) and 5.17 MPa (51.7 bar). At temperatures from 5 K to 105 K it has one phase in the space group Pbca.

Uses

Dichlorofluoromethane was used as a propellant and refrigerant, but due to its ozone depletion it has been set to be phased out. It has ozone depletion potential 0.04. Production and consumption has been since 2004 reduced to 15% of level from 1989 and it is to be phased out in 2015 according to Montreal Protocol.

References

  1. 1 2 3 4 5 "NIOSH Pocket Guide to Chemical Hazards #0197". National Institute for Occupational Safety and Health (NIOSH).
  2. 1 2 "Dichloromonofluoromethane". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
  • International Chemical Safety Card 1106
  • "NIOSH Pocket Guide to Chemical Hazards #0197". National Institute for Occupational Safety and Health (NIOSH).
  • Termochemistry data at chemnet.ru
  • Entry at Air Gas Liquide Encyclopaedia
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