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      1212.  ------.  [I. G. FARBENINDUSTRIE A. G.]  Cracking and Hydrogenating Oils.  British Patent 507,999, June 23, 1939; appl. filed Aug. 28, 1937.  Chem. Abs., vol. 34, 1940, p. 613. 

            Nonknocking motor fuels are obtained by subjecting paraffin hydrocarbons together with C₆H₆ and/or its light-boiling homologs and/or light-boiling hydroaromatic hydrocarbons to a heat treatment at 300°-700°, preferably in the presence of a rigid catalyst having a splitting and advantageously polymerizing action and, if desired, in the presence of H₂.  Light-boiling homologs of C₆H₆ and light-boiling hydroaromatic hydrocarbons are those boiling in the boiling range of benzines such as up to 225°.  In an example, BuH, C₆H₆ and H₂, at 530° and <250 atm. pressure, are led over a splitting and polymerizing catalyst comprising H₂MoO₄, ZnO, and MgO to obtain a liquid product the fraction of which boiling up to 180° may be used to improve the nonknocking properties of motor fuels. 

            See also British Patent 503,602 (abs. 1133) and United States Patent 2,245,157 (abs. 2661).