Dichlorofluoromethane

Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon with the formula CHCl2F. It is a colorless and odorless gas. It is produced by fluorination of chloroform using a catalyst such as antimony trifluoride:

CHCl3 + HF → CHCl2F + HCl
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
UN number 1029
  • InChI=1S/CHCl2F/c2-1(3)4/h1H Y
    Key: UMNKXPULIDJLSU-UHFFFAOYSA-N Y
  • InChI=1/CHCl2F/c2-1(3)4/h1H
    Key: UMNKXPULIDJLSU-UHFFFAOYAU
  • ClC(Cl)F
Properties
CHCl2F
Molar mass 102.92 g/mol
Appearance Colorless gas
Odor Ether-like
Density
  • 1.405 kg/m3 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·bar)−1
−48.8·10−6 cm3/mol
Thermal conductivity 0.0086 W/m·K (300 K)
Hazards
GHS labelling:
Warning
H280, H420
P410+P403, P502
Flash point Non-flammable
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)
  • 100,000 ppm (guinea pig, <1 hr)
  • 100,000 ppm (mouse, <1 hr)
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1000 ppm (4200 mg/m3)
REL (Recommended)
 TWA 10 ppm (40 mg/m3)
IDLH (Immediate danger)
 5000 ppm
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
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