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Literature Abstracts

 1807.    KOCH, H.  [Synthesis of Benzine From Carbon Monoxide and Hydrogen Under Atmospheric Pressure by the Method of F. Fischer and H. Tropsch.]  Glückauf, vol. 71, 1935, pp. 85-90; Ges. Abhandl. Kenntnis Kohle, vol. 12, 1937, pp. 577-587; Chem. Abs., vol. 29, 1935, p. 6401.

        Fundamental principles of the synthesis with reference to mechanism of reactions, preparation of catalysts, and reacting gases and properties of primary and secondary products.  The best gas mix contained 29% CO and 58% H₂, which with a Co catalyst yielded an oil 62% boiling at 30°-200°, containing 30% olefins.  Other products were 4% boiling at <30°, 23% boiling at <200°, and 14% solid paraffin.  A Co-Th catalyst precipitated on kieselguhr gave a yield of 110 gm. of oil for 60 days, after which the efficiency began to decrease.  The motor-spirit fraction must be rendered anti-knocking, for example, by blending with C₆H₆.  Heavy oils lend themselves to preparation of synthetic alcohols and motor spirit through cracking and subsequent treatment of cracked residues.  Lubricating oils of superior quality are prepared from the olefins by condensation in the presence of AlCl₃ or from the paraffins by chlorination and condensation with aromatic hydrocarbons, for example, xylene.  The mechanism of the reactions by which liquid hydrocarbons are formed involves formation of metallic carbides; these react with H₂, forming CH₂, which condenses.