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Dichlorofluoromethane

Fluorodichloromethane Monofluorodichloromethane Dichloromonofluoromethane Freon 21 Refrigerant 21 R 21 HCFC 21 Algofrene Type 5 Arcton 7 Halon 112 UN 1029 Genetron 21 | 1.405kg/m3 at 9°C | 1.366kg/m3 at 25°C | 800,000mg/m3 (mouse, 2hr) | 49,900ppm (rat, 4hr) | 100,000ppm (guinea pig, | 100,000ppm (mouse,

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

Uses

Dichlorofluoromethane was used as a propellant and refrigerant. Due to its role in ozone depletion, dichlorofluoromethane has been largely 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.

Pyrolysis of a mixture of dichlorofluoromethane and chlorofluoromethane gives hexafluorobenzene: :3 CHCl2F + 3 CH2ClF → C6F6 + 9 HCl

Additional physical data

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

Safety

Its toxicity is comparable to that of chloroform. Its TLV is 10ppm.

References

References

  1. Touloukian, Y.S., Liley, P.E., and Saxena, S.C. Thermophysical properties of matter - the TPRC data series. Volume 3. Thermal conductivity - nonmetallic liquids and gases. Data book. 1970.
  2. {{PGCH. 0197
  3. {{IDLH. 75434. Dichloromonofluoromethane
  4. "Bromine Compounds".
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hydrochlorofluorocarbons halomethanes ozone-depleting-chemical-substances refrigerants propellants chlorofluoroalkanes
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