1898. ------. [KÖLBEL, H.] (Steinkohlen-Bergwerk “Rheinpreussen”.). Diesel Fuels From Coal-Tar Oils. United States Patent 2,209,123, July 23, 1940; appl. filed Sept. 21, 1937, Serial No. 164,985, in Germany Sept. 24, 1936; 8 claims (Cl. 196-40). Chem. Abs., vol. 35, 1936, p. 303.

PATENTS

1898. ------. [KÖLBEL, H.] Diesel Fuels From Coal-Tar Oils. United States Patent 2,209,123, July 23, 1940; appl. filed Sept. 21, 1937, Serial No. 164,985, in Germany Sept. 24, 1936; 8 claims (Cl. 196-40). Chem. Abs., vol. 35, 1936, p. 303.

Diesel fuels are prepared from coal tar oils by mixing with a paraffinic oil b. 180°-380°, particularly synthetic Fischer-Tropsch benzine fractions; treating the mixture with H₂SO₄of approximately 20% concentrated; separating the upper layer of refined oil from an intermediate acid layer and a bottom sediment layer; and washing, drying, and bleaching the refined oil.