2880.----- [RUHRCHEMIE A. G.] [Catalytic Cracking of Hydrocarbons.] German Patent 759,895, Sept. 13, 1940; appl. R 108,321, R 536 (Cl. 23 b-1.04). TOM Reel 37, bag 3,451, Item 35; TOM Reel 177, frames, 1609-1611; Meyer Transl. PC--S

PATENTS

2880.----- [RUHRCHEMIE A. G.] [Catalytic Cracking of Hydrocarbons.] German Patent 759,895, Sept. 13, 1940; appl. R 108,321, R 536 (Cl. 23 b-1.04). TOM Reel 37, bag 3,451, Item 35; TOM Reel 177, frames, 1609-1611; Meyer Transl. PC--S—II, Fischer-Tropsch, vol. 1, chap. 34, 1948, p. 84.

Catalytic cracking of hydrocarbon vapors, such as paraffinic Kogasin, takes place in 3 stages:

1. Cracking, accompanied by formation of C deposits.

2. Removal of hydrocarbons from catalyst.

3. Regeneration of the catalyst by oxidation of the C deposit.

Paticularly high quality products were obtained by addtion of H₂O vapor to stage (1) (30-70 wt. % of initial hydrocarbons) and by flushing with pure H₂O vapor in (2). but serious fluctuations in temperature were observed. This eliminated by addition of an amount of H₂O vapor corresponding to a saturation temperature of 50°-70° C. in Stage (3) to the oxidizing gas. The process was especially suited to Al silicate catalysts (activated fuller’s earth). it ensured unifom operation of the converter and a constant operating temperature. 40% cracking gasoline was obtained. C deposit amount to 1.2-2.5 wt. %.