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Patent Abstracts

      1367.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  Oxidation of Hydrocarbons.  British Patent 482,954, Apr. 7, 1938.  Chem. Abs., vol. 32, 1938. p. 6665.

            Crude products containing solid paraffin hydrocarbons are dissolved in liquid aromatic nitrohydrocarbons or mixtures containing them and the solutions are cooled; solid paraffin hydrocarbons are deposited, and these are separated and oxidized with nitrogenous oxidizing agents.  Suitable starting materials are brown coal tars or coal- or tar-hydrogenation products containing paraffin wax.  The solution and cooling treatment may be repeated, with the same or another solvent of the above described type, before the oxidation of the paraffin hydrocarbons and the solvent adhering to the hydrocarbons may be separated or allowed to remain.  Among examples, dehydrated brown coal tar is stirred with PhNO₂ at about 50º, the mixture cooled to 15º, and the deposited paraffin filtered and then treated at about 80º with HNO₃ of 45% concentration: the product separates in layers, 1 of which is a PhNO₂ solution of oxidation products, which are separated, treated with H₂O, and then freed from PhNO₂ by distillation, preferably under reduced pressure; the residual oxidation product is then worked up in known manner to yield fatty acids useful for making soaps: the oxidation product may include di-as well as mono-carboxylic acids.