Process for the manufacture of 1,1,1,2-tetrafluoroethane
AssigneeAllied-Signal Inc.
InventorsLi Wang, Timothy J. Barder, Mark Kaiser, Russell W. Johnson, Blaise J. Arena
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Abstract
An improved process for the vapor phase fluorination, especially fluorination of 1,1,1-trifluoro-2-chloroethane (CFC-133a) with HF to produce 1,1,1,2-tetrafluoroethane (HFC-134a) employs a catalyst which preferably consists essentially of boehmite and Cr(OH)Cl.sub.2.2H.sub.2 O, combined and extruded to form particulates and then heated in nitrogen.
Claims7
A process for the vapor phase fluorination of hydrocarbons and or halogenated hydrocarbons with hydrogen fluoride over a catalyst at fluorination conditions wherein said catalyst consists essentially of the product of heating in nitrogen at a temperature of about 300.degree. C. to 650.degree. C. a mixture of an aluminum oxide hydrate selected from the group consisting of boehmite, beat aluminum oxide monohydrate, and alpha or beta alumina trihydrate and an acidic chromium compound selected from the group consisting of Cr(OH)Cl.sub.2.2H.sub.2) CrCl.sub.3, Cr(NO.sub.3).sub.3, Cr(OH)(CH.sub.3 COO).sub.2, Cr(CH.sub.3 COO).sub.3 and (Cr(OH).sub.2 (CH.sub.3 COO).sub.7, said chromium having a valence of 3.
Dependencies are inferred from the claim text.