3235.     SPAGHT, M. E.  German Wartime Aviation Fuels by Hydrogenation of Coal.  Ruhrchemie Catalytic Cracking Process.  U. S. Naval Tech. Mission in Europe, Rept. 145-45, 1945, 45 pp., PB 1,657; Oil Gas Jour., vol. 44, No. 41, 1946, p. 124; BIOS Misc. Rept. 72, 1948, 45 pp., PB 1,657.

        Describes process for cracking the highly paraffinic Fischer-Tropsch products to form a maximum of olefins for chemical synthesis intermediates.  A synthetic silica-alumina catalyst was used, 0.7 apparent specific density, with a space velocity of 0.1 yielding a 40% conversion per pass on a 340°-660° F. Fischer-Tropsch fraction, of which nearly 70% was olefins up to C₅ and only 15% gasoline.  The process was intermittent and catalyst was regenerated after 20-25 min. cycles, showing about 1.5% coke deposition.  Product distribution was as follows in % wt. of feed:  Gasoline C₆ to about 320° F. 6-8; C₅ 7.6-9.6; C₄ 10-12; C₃ 8-10; C₂ 2-2.8; CH₄ and H₂ 0.4-0.8; coke 1.2-1.6