PATENTS

1884.  KLEIN, O., AND MEYER, K. (Braunkohle-Benzin A.-G.). [Reclaiming Cobalt and Thorium From Spent Contact Catalysts.] German Patent 722,553, July 14, 1942; appl. B 186,476, filed Mar. 22, 1939 (Cl. 12 o-1.03). FIAT Reel AA-90, frames 1,571-1,572; PB 70,275; Meyer Transl. PC-S-II, Fischer-Tropsch, vol. 5, chap. 156, 1949, p. 36; Chem. Abs., vol. 37, 1943, p. 5205

Catalyst from the hydrogenation of CO is dissolved in H2SO4 and filtered. In the filtrate Th is precipitated with K2SO4 as the double sulfate. After filtering off the precipitate, the Fe is precipitated as Fe (OH)3 with an alkali carbonate. Finally the Co is precipitated as carbonate. The CO and Fe can be precipitated together by dissolving the precipitate in HNO3, 1st precipitating the Fe by bringing the pH to about 5.8. The residual Co solution can then be used for making the catalyst for CO hydrogenation.

KLEINE, J. See abs. 2664.