PATENTS

3170.----- [RUHRCHEMIE, A. G.]   Regenerating Catalysts.  British Patent 484,962, June 9, 1938; appl. filed Sept. 22, 1937.  Chem. Abs., vol. 32, 1938, p. 8088.

In regenerating catalysts used in benzine synthesis by dissolving the metals in acid and again precipitating and reducing them, the catalyst is first treated at 300° or more with H₂ steam, or inert gases or with 2 or more of these simultaneously or  successively to remove deposited organic substances.  When steam is used the pyrophoric properties of the catalyst are destroyed.  If desired an extraction with solvents may precede the treatment with gases.  In an example a catalyst consisting of Co, ThO₂, and kieselguhr is specified.