Everything about Fluoroform totally explained
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Fluoroform is the
chemical compound with the formula CHF
3. It is one of the "
haloforms", a class of compounds with the formula CHX
3 (X =
halogen). Fluoroform is used in diverse niche applications and is produced as a by-product of the manufacture of
Teflon. Fluoroform is also generated biologically in small amounts apparently by
decarboxylation of trifluoroacetic acid.
Additional physical properties
Industrial applications
CHF
3 is used in the
semiconductor industry in
plasma etching of
silicon oxide and
silicon nitride.
As a
refrigerant, CHF
3 is known as R-23 or HFC-23.
HFC-23 is also used as a replacement for
Halon 1301[cfc-13b1] in
fire suppression systems as a total flooding
gaseous fire suppression agent. It is also used as a low temperature refrigerant (replacement for
Chlorotrifluoromethane (cfc-13). It is a byproduct of its manufacture. When used as a fire suppressant, the chemical carries the
DuPont trade name,
FE-13. CHF
3 is recommended for this application because of its low toxicity, its low reactivity, and its high density.
CHF
3 is a potent
greenhouse gas. The secretariat of the Clean Development Mechanism estimates that a ton of HFC-23 in the atmosphere has the same effect as 11,700 tons of carbon dioxide. The atmospheric lifetime is 260 years.
According to researchers, it's the most abundant of
hydrofluorocarbons (HFCs). Its usage has been regulated since December 1997 at
Kyoto climate conference.
Chemistry
It was first obtained by Meslans in the violent reaction of
iodoform with dry
silver fluoride in 1894. The reaction was improved by
Otto Ruff by substitution of silver fluoride by a mixture of
mercury fluoride and
calcium fluoride. The exchange reaction works with iodoform and
bromoform, and the exchange of the first two
halogen atoms by fluorine is vigorous. By changing to a two step process, first forming a bromodifluoro methane in the reaction of
antimony trifluoride with bromoform and finishing the reaction with mercury fluoride the first efficient synthesis method was found by Henne.
Organic chemistry
CHF
3 is a reagent to generate CF
3- reagents by deprotonation. The molecule is weakly acidic with a pKa = 25–28. It is a precursor to CF
3Si(CH3)3Further Information
Get more info on 'Fluoroform'.
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