275. ------. [BÜCHER, K.] (Hydrocarbon Synthesis Corp.). Regeneration of Catalysts Containing Thorium. United States Patent 2,278,644, Apr. 7, 1942; appl. filed June 26, 1939, Serial No. 281,152; in Germany July 1, 1938; 6 claims (Cl. 23-23). Chem. A

Patent Abstracts

275. ------. [BÜCHER, K.] (Hydrocarbon Synthesis Corp.). Regeneration of Catalysts Containing Thorium. United States Patent 2,278,644, Apr. 7, 1942; appl. filed June 26, 1939, Serial No. 281,152; in Germany July 1, 1938; 6 claims (Cl. 23-23). Chem. Abs., vol. 36, 1942, p. 4982.

Process is employed for recovering Th values of high catalytic activity, virtually free from Fe, Ni, Co, Al₂O₃ and SiO₂, from spent Th catalysts containing substantial amounts of Fe, such as those used in the production of hydrocarbons from CO and H₂, which involves treating them at a moderately elevated temperature with an inorganic acid to extract the catalytically active constituents, adding to the resulting acid solution a soluble carbonate to produce a precipitate rich in Th, dissolving this precipitate in H₂SO₄, precipitating the Th from the H₂SO₄ solution as Th K sulfate, and converting the latter into insoluble Th hydrocarbonate.