3033. ----- [RUHRCHEMIE, A. G.] [Process for Making High Antiknock Motor Fuels.] German Patent Appl. R 104,049, R 425, filed Dec. 14, 1938 (Cl. IV d-12 o). TOM Reel 37, bag 3,451, item 35, 4 pp.; TOM Reel 177, frames 1,570-1,573; Meyer Transl. PC-S-I

PATENTS

3033. ----- [RUHRCHEMIE, A. G.] [Process for Making High Antiknock Motor Fuels.] German Patent Appl. R 104,049, R 425, filed Dec. 14, 1938 (Cl. IV d-12 o). TOM Reel 37, bag 3,451, item 35, 4 pp.; TOM Reel 177, frames 1,570-1,573; Meyer Transl. PC-S-II. Fischer-Tropsch, vol. 1, chap. 25, 1948, p. 64.

High-antiknock fuel, suitable for aviation fuel, is produced from any hydrocarbon fraction, especially the diesel-oil fraction b. 200°-320° and obtained by the conversion of CO by H₂ by cracking in vacuum (about 100 mm. pressure) without a catalyst at temperature of 650°-800° to the gaseous form and then polymerizing in the presence of an Ag-activated H₃PO₄catalyst at about 100 atm. pressure and increased temp of 200°-250°, followed by a mild hydrogenation with H₂ in presence of a Co-Th-kieselguhr catalyst and at a temp. of 175°-200°. The product is fractionally distilled, the cut being made at 160°, the lower fraction having an octane number of 74, which can be raised to 89-90 by addition of 0.9 cc. Pb per 1.