Manufacture of halogenated compounds
AssigneeImperial Chemical Industries PLC
InventorStephen L. Bell
Life of this patent
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Abstract
Manufacture of 1,1,1,2-tetrafluorethane by reacting 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in the presence of a chromium oxide catalyst and reducing the 1,1-difluoro-2-chloroethylene content of the impure 1,1,1,2-tetrafluoroethane product by intimately contacting the impure product with an aqueous solution of a metal permanganate.
Claims14
A process for the manufacture of 1,1,1,2-tetrafluoroethane which comprises reacting in the vapour phase at elevated temperature a haloethane of formula CX.sub.3 CH.sub.2 Y wherein X is bromine, chlorine or fluorine and Y is chlorine with hydrogen fluoride in the presence of a catalyst which is chromium oxide or which is at least in part basic chromium fluoride and wherein the 1,1,1,2-tetrafluoroethane product containing 1,1-difluoro-2-chloroethylene as impurity is intimately contacted with a metal permanganate in a liquid medium whereby said haloethylene content is reduced.
A process for the reduction of 1,1-difluoro-2-chloroethylene impurity contained in 1,1,1,2-tetrafluoroethane which comprises intimately contacting said impure 1,1,1,2-tetrafluoroethane with a metal permanganate in a liquid medium.
Dependencies are inferred from the claim text.