PATENT

3618. ----- [STEINKOHLEN-BERGWERK “RHEINPREUSSEN”].  [Treatment of Coal-Tar Oils.].  French Patent 827,049, Apr. 14, 1938.  Chem. Abs., vol. 32, 1938, p. 6846.

Coal-tar oils are mixed with a paraffin hydrocarbon mixture b. 180°-350°, preferably a synthetic mixture prepared from CO and H₂ and the mixture is treated with a dilute acid, preferably dilute H₂SO₄, at atmospheric temperature for a short time.  The mixture is then allowed to settle, and the uppermost layer, consisting of a mixture of tar oil and paraffin hydrocarbons, is separated, washed, and dried and may then be used as fuel for diesel motors.  Gives example.