2634. PFIRRMANN, T. W. High-Quality Benzine and Diesel Motor Fuels. United States Patent 2,232,673, Feb. 18, 1941; appl. filed Aug. 23, 1938, Serial No. 226,243, in Germany Aug. 30, 1937; 1 claim (Cl. 196-62). Chem. Abs., vol. 35, 1941, p. 3418

Brown coal tar is mixed with an equal amount of Kogasin middle oil obtained by reduction of CO with H₂, causing a separation into 2 layers of different specific gravity. This separation permits high yields since each layer can be hydrogenated under the most favorable conditions.

------. See abs. 3766, 3767, 3768, 3769, 3770.