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US 4,158,023 AGranted
Process for the manufacture of octafluoropropane
AssigneeHoechst Aktiengesellschaft
InventorSigmar P. von Halasz
Life of this patent
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Abstract
Octafluoropropane, C.sub.3 F.sub.8, is prepared by a two-step process. In the first step hexafluoropropene is reacted with hydrogen fluoride in the presence of a chromium oxyfluoride catalyst. The 2H-heptafluoropropane obtained is reacted with fluorine in the presence of a catalyst which contains a subgroup element of the Periodic System as a free metal or as a fluoride. Octafluoropropane is isolated from the resulting gas mixture. Hydrogen fluoride also obtained may be recycled to the first reaction step.
Claims7
A process for the manufacture of octafluoropropane from hexafluoropropene, which comprises
- converting hexafluoropropene with hydrogen fluoride in a first reaction step to 2H-heptafluoropropane, at a temperature of from 100.degree. to 350.degree. C. and in the presence of a chromium oxyfluoride catalyst, and
- converting in a second reaction step the reaction gas obtained with elementary fluorine to octafluoropropane, at a temperature of from 100.degree. to 350.degree. C. in the presence of a catalyst containing an element of one of the groups IIIB to VIIB, VIII, IB or IIB of the Periodic System or a flouride compound thereof, and subsequently separating the hydrogen fluoride formed from the octafluoropropane.
Dependencies are inferred from the claim text.