1902. ------. [KÖLBEL, H.] (Steinkohlen-Bergwerk "Rheinpreussen"). [Motor-Fuel Oil.] German Patent 724,054, Aug. 25, 1942; appl. St. 56,117, filed Apr. 23, 1937 (Cl. 12 r-1.05). Chem. Abs., vol. 37, 1943, p. 5573.

Mixtures of tar oils or tar fractions, preferably with aliphatic hydrocarbons, b. 160°-360°, are extracted with AcOH at normal temperature. Two layers are formed, the upper of which contains the refined motor fuel. Further refining is performed by washing with H₂O or lye or bleaching with "Tonsil." This process is advantageous for mixing tar oils with hydrocarbons obtained in the Fischer-Tropsch synthesis. The fuels are intended for use in tractors and diesel motors.