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 7

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, 1^st 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.