Tetrafluoromethane
- Carbon tetrafluoride
- Carbon tetrafluoride
- Freon 14
- Halon 14
- R 14
Odorless and colorless gas
Gaseous
3.72 kg · m -3 ( 15 ° C, 1013 mbar),
-184 ° C
-128 ° C
Sparingly soluble in water: 20 mg · l-1 (20 ° C)
Attention
7390 (based on 100 years)
-933.6 KJ / mol
Template: Infobox chemical / molecular formula search available
Tetrafluoromethane ( carbon tetrafluoride also ) is a chemical compound from the group of the fluorocarbons. For him, all the hydrogen atoms of methane are replaced by fluorine atoms. Both names are according to the IUPAC nomenclature correctly, depending on whether the organic compound as the ( tetrafluoromethane ) or inorganic ( carbon tetrafluoride ) compound is viewed.
Representation
Tetrafluoromethane can be represented on the one hand by combustion of carbon in fluorine, the other hand by means of electrical discharge in a fluorine - carbon monoxide mixture:
Properties
Physical Properties
Tetrafluoro methane is a colorless and odorless gas with a melting point of -184 ° C and a boiling point of -128 ° C. Tetrafluoro methane in water is very poor (20 mg per kg of water at 20 ° C), soluble in ethanol ( 80 mg per kg of ethanol at 25 ° C ) and benzene (about 64 mg per kg of benzene at 25 ° C) slightly better.
Chemical Properties
Tetrafluoromethane is very inert and is not attacked by acids and bases, an exception is the explosive reaction with alkali metals dar. Thermal decomposition yields toxic products ( carbonyl fluoride, carbon monoxide ) in the presence of water and the corrosive hydrogen fluoride.
It has a GWP of 7390, making it an extremely potent greenhouse gas.
Use and emissions
Tetrafluoromethane is used as the refrigerant to replace CFC's, because it has no reduction effect on the ozone layer. Due to the high global warming potential, however, is set in the F- Gas Regulation, that investments with the corresponding gases to give the lowest possible leakage quantities. Large amounts tetrafluoro methane are released during the production of aluminum.
Toxicology
Tetrafluoro methane is considered non-toxic. However, it can result in closed rooms by displacing the air suffocation. At lower concentrations, a narcotic effect is possible.