3121.----- [RUHRCHEMIE, A. G.] [Process for Preparing of High-Octane Hydrocarbons.] German Patent Appl. R 109,970, R 569, filed May 2, 1941 (Cl. 23 b-1.04).. TOM Reel 36, bag 3,454, item 20, 5 pp.; TOM Reel 39, bag 3,453, item 1; TOM Reel 177, frames 1

PATENTS

3121.----- [RUHRCHEMIE, A. G.] [Process for Preparing of High-Octane Hydrocarbons.] German Patent Appl. R 109,970, R 569, filed May 2, 1941 (Cl. 23 b-1.04).. TOM Reel 36, bag 3,454, item 20, 5 pp.; TOM Reel 39, bag 3,453, item 1; TOM Reel 177, frames 1,620-1,624; Meyer Transl. PC-S-II, Fischer-Tropsch, vol. 1, chap. 37, 1948, p91; vol. 2, chap. 77, 1948, p. 5.

Large yields of high-octane gasolines (motor octane=97) are obtained by catalytic cracking of hydrocarbons mixed with steam and isomerization of the cracking products. the hydrocarbon mixture is composed of paraffinic hydrocarbons b. > 150° C. and low-boiling olefins (C₄, C₅, C₆) that are readily isomerized together with the cracking products in the presence of phosphoric acid catalysts. The ratio of the partial pressure of hydrocarbons to that of steam should be < 0.2. Cracking is carried out in the presence of activated Al silicates at about 500° C. 3 examples.