2974. ----- [RUHRCHEMIE, A. G.] [Method for Purifying Magnesia for Use in Catalyst Manufacture.] German Patent Appl. R 114,640, R 641, filed Nov. 14, 1942, (Cl. IV b-12 a). FIAT Reel K-30, frames 8,039-8,041; PB 73,587;TOM Reel 177, frames 1,485-1,47

PATENTS

2974. ----- [RUHRCHEMIE, A. G.] [Method for Purifying Magnesia for Use in Catalyst Manufacture.] German Patent Appl. R 114,640, R 641, filed Nov. 14, 1942, (Cl. IV b-12 a). FIAT Reel K-30, frames 8,039-8,041; PB 73,587;TOM Reel 177, frames 1,485-1,477; TOM Reel 36, bag 3,454, item 36. 3 pp.; Meyer Transl. PC—S—II, Fischer-Tropsch, vol. 1, chap. 3, 1948, p. 9.

Commercial magnesia is purified of its lime and made suitable for the preparation of the Co-MgO-ThO₂- kieselguhr catalyst by washing in the mother liquor remaining from a previous catalyst preparation. The treatment is continued until the magnesia present is converted and removed as the bicarbonate. likewise the small % of Co present in the mother liquor as bicarbonate is precipitated and recovered as metallic Co.