191.    BENDER, R. J.  German Wartime Diesel Fuels Were Blends of Natural and Synthetic Products.  Nat. Petrol. News. Tech. Sec., vol. 38, No. 6, 1946, pp. R-104, R-106; BIOS Miscell. Rept. 71, 30 pp.; U.S. Naval Tech. Mission in Europe, Rept. 187-45, 1945, 42 pp.; TOM Reel 200; PB 1,675 and 2,529.

                  Principal sources of German diesel fuel were the following:  (a) Natural-petroleum distillates; (b) synthetic distillate known as Kogasin II, the high-bowling fractions distilled from Fischer-Tropsch low-pressure, low-temperature catalytic process, having a high cetane No., 90-100, but as compared with petroleum diesel fuel of 47-cetane rating, not suitable when used alone because of its higher consumption and the increase of 25% in the exhaust-gas temperature.  It was, therefore, used mainly to upgrade the ignitibility of other fuels such as petroleum-gas oil or coal or lignite-tar oil, in which case the mixture is purified by selective extraction; (c) Kogasin I, the lighter fraction distilled in the Fischer-Tropsch process boiling below 430° F, with a cetane number of 35-60; (d) distillates from the low-temperature carbonization of coal and lignite; (e) distillates from the hydrogenation process containing 38-49% aromatics and unsaturates good for blending with Kogasin II; (f) shale oil.