Chlorotrifluoroethylene telomerization process
AssigneeOccidental Chemical Corporation
InventorBobby F. Dannels
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Abstract
An improved process for preparaing telomers of chlorotrifluoroethylene comprises the solution telomerization reaction of chlorotrifluoroethylene with carbon tetrachloride in the presence of a catalytic amount of cupric chloride (CuCl.sub.2) and an iron reductant. Preferably, the solvent for the system comprises acetonitrile, and the telomerization is carried out under elevated pressure conditions and at a temperature in the range of from about 90.degree. C. to about 150.degree. C. The crude telomer prepared by this process can be fluorinated to produce a stabilized oil or grease.
Claims11
A process for preparing a distribution of telomers of chlorotrifluoroethylene of general formula CCl.sub.3 (CF.sub.2 CFCl).sub.n Cl, where n is from about 1 to about 20, consisting essentially of reacting chlorotrifluoroethylene with carbon tetrachloride in the presence of a catalytic amount of CuCl.sub.2 and iron, said reaction being conducted in a solvent at a temperature of from about 90.degree. C. to about 150.degree. C.
A process for preparing stabilized telomers of chlorotrifluoroethylene, consisting essentially of the steps of:
- (a) reacting chlorotrifluoroethylene with carbon tetrachloride in the presence of a catalytic amount of CuCl.sub.2 and iron to prepare a distribution of telomers of general formula CCl.sub.3 (CF.sub.2 CFCl).sub.n Cl, where n is from about 1 to about 20, said reaction being conducted in a solution of acetonitrile at a temperature of from about 90.degree. C. to about 150.degree. C.,
- (b) removing solvent and unreacted materials from the telomers produced in step (a), and
- (c) directly fluorinating the telomers from step (b) to stabilize the telomers.
Dependencies are inferred from the claim text.