Top Qs
Timeline
Chat
Perspective

Dichlorofluoromethane

Chemical compound From Wikipedia, the free encyclopedia

Dichlorofluoromethane
Remove ads

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:[4]

CHCl3 + HF → CHCl2F + HCl
Quick Facts Names, Identifiers ...
Remove ads

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:[4]

3 CHCl2F + 3 CH2ClF → C6F6 + 9 HCl
Remove ads

Additional physical data

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.

Safety

Its toxicity is comparable to that of chloroform. Its TLV is 10 ppm.[4]

References

Loading related searches...

Wikiwand - on

Seamless Wikipedia browsing. On steroids.

Remove ads