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      1218.  ------.  [I. G. FARBENINDUSTRIE A. G.]  Cracking Oils.  British Patent 480,442, Feb. 21, 1938.  Chem. Abs., vol. 32, 1938, p. 6047.

            Hydrocarbon mixtures b. >250° prepared by the reduction of CO with H₂ are purified before their subjection to cracking by (a) treatment with chemical refining agents, for example, H₂SO₄ or metal halides, for example.  AlCl₃, FeCl₃, BF₃, ZnCl₂.  TiCl₄; (b) treatment with selective solvents, for example, phenols, keto-acids, glycol acetate, liquid SO₂, or liquid NH₃; or (c) passage together with the residual gases from the CO reduction process, or with fresh H₂, over known hydrogenation catalysts, for example, compounds, particularly oxides or sulfides, of metals of the 5th-8th groups.  The mixtures are preferably freed from low-boiling fractions and from paraffin before being refined.  A mixture of CO and H₂ in the ratio 1 : 2 is led at 200° over a catalyst containing Co, Th, and bleaching earth, the fraction b.>320° is freed from paraffin and treated with 2% H₂SO₄ and subsequently with a bleaching earth, and the oil obtained is craced at 550°-600° the products of high b. p. being returned:  72% of oil, consisting of benzine and middle oil 58%, gaseous hydrocarbons 27%, and coke 0.5%, is obtained.