481. ------. [DEUTSCHE HYDRIERWERKE A. G.] Carboxylic Acids. British Patent 492,595, Sept. 22, 1938. Chem. Abs., vol. 33, 1939, p. 1762.

Patent Abstracts

Soap-forming carboxylic acids or their salts are made by fusing with alkali-metal or alkaline-earth-metal bases the mixtures of glycols or products containing oxide groups obtained by oxidation of technical mixtures of aliphatic, aliphatic-alicyclic, or aliphatic-aromatic hydrocarbons, containing besides 1 or more unsaturated linkages in an aliphatic chain, at least 1 saturated aliphatic chain of at least 6 C atoms. Suitable hydrocarbon mixtures are unsaturated tar oils b. 200º-350º obtained by distilling lignite or cracking gas oil fractions b. 200º-325º and containing 70%-75% of olefins having 12-18 C atoms and olefinic products of the hydrogenation of CO. The unsaturated linkages may be oxidized with permanganates, persulfates, hypochlorites, H₂O₂, Cl, O₂, or air, preferably in the presence of solvents or diluents such as AcOH or Ac₂O, dioxane, Me₂CO, mineral oils or saturated hydrocarbons present in the initial mixtures. The hydrocarbons may 1^st be converted into aqueous emulsions with soaps, fatty alcohol sulfonates. Among examples, with soaps, fatty alcohol sulfonates. Among examples, a benzine obtained by hydrogenation of CO, containing about 50% of higher olefins, is emulsified with soap and oxidized with H₂O₂at 90º. The dried product is melted with caustic alkali at 250º-280º and the melt decomposed with mineral acid.