1-Chloro-1,1-difluoroethane

• R 142b
• HCFC- 142b
• Chlorodifluoroethane

Colorless gas with a faint odor

Gaseous

4.71 kg · m-3

-130.8 ° C

-9.6 ° C

0.29 MPa ( 20 ° C)

Risk

1000 ppm

2,310 (relative to 100 years)

Template: Infobox chemical / molecular formula search available

1-chloro- 1 ,1 -difluoroethane is a non-naturally occurring chemical compound, a colorless, slightly ethereal smelling gas that is heavier than air. It belongs to the partially halogenated chlorofluorocarbon substances damage the ozone layer and is a greenhouse gas.

Properties and toxicology

The gas is highly flammable and forms explosive mixtures with air. It is also dangerous because it can accumulate unnoticed in enclosed spaces. In a laboratory study with rats, no toxic effects of the substance could be detected; In a study with mice and rats, toxic effects only at extremely high doses ( inhalation of 1.7 and 2 kg within 2 and 4 hours).

Extraction

Chlorodifluoroethane is prepared industrially by the reaction of vinylidene chloride with hydrogen fluoride or by fluorination of 1,1,1 -trichloroethane.

Use

Chlorodifluoroethane is used as the refrigerant, and due to this can be detected most use in small amounts in air. It is also a starting material for the production of vinylidene fluoride, and thus the plastic polyvinylidene fluoride. Moreover, chlorodifluoroethane can replace the much more harmful to the ozone layer of trichlorofluoromethane as a blowing agent for producing foam.