method for regeneration of a catalyst for the hydrierende dechlorierung of dichloressigsäure and / or trichloroacetic acid to monochloressigsäure

摘要

1,269,862. Regeneration of palladium catalysts. KNAPSACK A.G. 22 April, 1970, [24 April, 1969], No. 19326/70. Heading B1E. [Also in Division C2] Catalyst comprising metallic palladium supported on silica gel or active carbon for use in the production of acetic acid and/or monochloroacetic acid by hydrogenative dechlorination of dichloroacetic acid and/or trichloroacetic acid is regenerated in the hydrogenation zone of the reactor by treatment at a temperture of from 50 to 200‹C with dry chlorine gas, the hydrogenation zone being exhausted to a pressure of from 500 to 750 mm. Hg either simultaneous with or subsequent to the treatment of the catalyst with chlorine gas. The hydrogenation zone, which may be made of or lined with silver, may be scavenged with nitrogen prior to and after catalyst regeneration.