3022. ----- [RUHRCHEMIE, A. G.] [Process for Dehydrogenating High-Molecular Hydrocarbons.] German Patent Appl. --, R 728, filed Sept. 30, 1944. FIAT Reel K-30, frames 7,736-7,739; PB 73,587; TOM Reel 36, bag 3,454, item 25.

High-molecular hydrocarbons are dehydrogenated in presence of catalysts consisting of materials containing silicic acid, chiefly Al or Mg silicates, deposited on bleaching earth, which has previously been heated for a long time to temperatures > 500°, preferably > 1,000°. Example: Acid-activated bleaching earth (Tonsil) is heated for 90 min. to 1,100° and then for 3 hr. at this temperature. After cooling 150 gm. are stirred with 330 gm. Cr(NO₃)₃, 200 gm. Cu(NO₃)₂, and 30 gm. NaNO₃ to a thick syrup like mass, after which the product is heated for different periods and temperatures and then calcined at 600°. Over 200 cc. of this catalyst are passed hourly at 510° and 600 mm. Hg with 80 cc. of the paraffinic hydrocarbon mixture obtained by the hydrogenation of CO and containing up to 90% of C₁₇-C₁₈ hydrocarbons. A conversion to lower-molecular olefnic and paraffinic hydrocarbons with 42% of olefins takes place. The product consists of 4% H₂ and CH_4,9% C₂ and C₃ hydrocarbons with 80% olefins, 9% C₅ and C₆hydrocarbons with 60% olefins, 24% C₇-C₁₉ hydrocarbons with 96% olefins, 21% C₁₁-C₁₃ hydrocarbons with 80% olefins, 5% C16 hydrocarbons with 25% olefins, 26% olefins with a C number in the raw material boiling range, and 2% C. 60-75% of the olefins obtained have double bonds in the end position.