Process for the manufacture of pentafluoroethane
AssigneeImperial Chemical Industries PLC
InventorsCharles John Shields, Paul Nicholas Ewing
Life of this patent
Estimating the term…
Abstract
Process for the manufacture of pentafluoroethane HFC 125! by reaction of perchloroethylene with hydrogen fluoride in the vapor phase over a fluorination catalyst in a fluorination reactor with recycle of dichlorotrifluoroethane HCFC 123! and chlorotetrafluoroethane HCFC 124! to the fluorination reactor, wherein tetrafluoroethane HFC 134a! is also recycled to the fluorination reactor. The tetrafluoroethane and the chlorotetrafluoroethane can both be separated from the product stream in a single distillation column and recycled, together to the fluorination reactor.
Claims6
A process for the manufacture of pentafluoroethane by reaction of perchloroethylene with hydrogen fluoride in the vapour phase over a fluorination catalyst in a fluorination reactor with recycle of dichlorotrifluoroethane and chlorotetrafluoroethane to the fluorination reactor, characterised in that tetrafluoroethane is also recycled to the fluorination reactor, wherein tetrafluoroethane is converted into chlorotrifluoroethane by reaction with hydrogen chloride produced in the reactor.
Dependencies are inferred from the claim text.