Preparation of tetrafluoroethylene
AssigneeE. I. Du Pont de Nemours and Company
InventorJames Lang Webster
Life of this patent
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Abstract
Tetrafluoroethylene is obtained by subjecting metal fluoride, such as sodium fluoride, calcium fluoride or silicon fluoride, to a plasma to form a gaseous mixture of metal and reactive fluorine. This gaseous mixture is then reacted with a bed of carbon particles at a temperature at which the metal, when non-carbonaceous, does not condense. The resultant reaction mixture is then quenched to obtain the tetrafluoroethylene. Typically, the plasma will be at a temperature of at least 4500.degree. C. and the temperature of the carbon bed will be in the range of 2000.degree. C. to 3500.degree. C.
Claims27
A process for the preparation of tetrafluoroethylene, comprising
- (a) subjecting non-carbonaceous metal fluoride to a plasma to cause the metal fluoride to dissociate into a gaseous mixture of metal and reactive fluorine in the absence of halogen other than said fluorine,
- (b) flowing the gaseous mixture into intimate contact with particulate carbon at a temperature which is greater than the temperature at which the metal in the gaseous mixture condenses, whereby said reactive fluorine and said carbon react with one another to form gaseous precursor to said tetrafluoroethylene, and
- (c) quenching said gaseous precursor to obtain gaseous tetrafluoroethylene.
Dependencies are inferred from the claim text.