PATENTS

3056.----- [RUHRCHEMIE, A. G.]  [Process for Producing a High-Antiknock motor Fuel.]  German Patent Appl. R 106,921, PA 86,822, filed Feb. 8, 1940 (Cl. IV d-12 o).  FIAT Reel B-196, frames 809-811; PB 83,253.

Unsaturated hydrocarbons obtained by the catalytic cracking of high-molecular hydrocarbons are treated at high temperature and pressure (up to 300° and 50-200 atm.) with CO and H₂ to convert the olefins into alcohols, which finally are dehydrated and hydrogenated.  Previous to the water-gas treatment, a treatment with boryl phosphate, bleaching earth, or other similar agents at temperatures of 200°-300° is carried out for the purpose, in part, to isomerize the unsaturated hydrocarbons and in part to shift the double bond toward the middle of the chain.  Also, previous to the water gas treatment, a selective polymerization of the isohydrocarbons is introduced.  Following the dehydration of the product and previous to its hydrogenation, purpose the extensive conversion of the C₃-C₅ hydrocarbons into high octane aviation gasoline.  It is stated that the gasoline product obtained by the dehydration is distributed in such a way that the low-molecular hydrocarbons are the first to be subjected to selective polymerization and the middle-molecular hydrocarbons to water gas treatment, and the high molecular hydrocarbons are directly hydrogenated.  The process permits virtually complete conversion of the C₃-C₅ hydrocarbons, occurring in considerable amounts in catalytic cracking, to an aviation gasoline of exceedingly high octane no.