1133. ------. [I. G. FARBENINDUSTRIE A. G.] Antiknock Fuel. British Patent 503,602, Apr. 6, 1939; appl. filed Sept. 6, 1937. Chem. Zentralb., II, 1939, p. 2490; Chem. Abs., vol. 33, 1939, p. 7552.

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Patent Abstracts

Antiknock fuels are produced by cracking in the vapor phase at 400°-700° hydrocarbon oils consisting wholly or substantially of unsaturated hydrocarbons boiling at last for the greater part > the boiling point of benzines, whereas cyclic hydrocarbons, particularly mononuclear aromatic hydrocarbons, such as C₆H₆, toluene, and xylene, that are vaporous under the reaction conditions are added, the reaction being conducted in the absence of substantial amounts of H₂ or gases supplying H₂. Oil fractions rich in unsaturated hydrocarbons and boiling > 200° for use as the initial materials are obtained by cracking mineral oils and tars, such as mineral oil or brown coal tar fractions containing wax; products of the destructive hydrogenation of coals, tars and oils; or oils produced by the reduction of CO. The reaction is preferably conducted in the presence of catalysts. Any low-boiling unsaturated products are polymerized in a further reaction zone filled with polymerizing catalysts. In an example, a fraction of boiling range 150°-300°, obtained by cracking brown-coal paraffin, is mixed with an equal amount of C₆H₆ and heated to 510° in a tubular reaction chamber under 150 atm. The product is distilled to separate a fraction b. 140°-200° that, after being refined with H₂SO₄, or bleaching earth, gives a good antiknock fuel with a flash point of 40°.

See also Belgian Patent 429,755 (abs. 1219).