1391. ------. [I. G. FARBENINDUSTRIE, A. G.] [Preparation of Dicarboxylic Acids.] German Patent Appl. I 78,338, OZ 14,975, filed Oct. 9, 1944 (Cl. IV d-12 6). FIAT Reel 171, frames 10,869-10,874: PB 25,615: Meyer Transl. PC-S-IV. Wax Oxidation. Vol.

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Patent Abstracts

1391. ------. [I. G. FARBENINDUSTRIE, A. G.] [Preparation of Dicarboxylic Acids.] German Patent Appl. I 78,338, OZ 14,975, filed Oct. 9, 1944 (Cl. IV d-12 6). FIAT Reel 171, frames 10,869-10,874: PB 25,615: Meyer Transl. PC-S-IV. Wax Oxidation. Vol. 3, chap.. 46, 1949, p. 27.

Dicarboxylic acids with 5 or more C atoms in the molecule are made from saturated aliphatic hydrocarbons with 5 or more C atoms in the molecule, such as the paraffin obtained by CO hydrogenation and b. 240º-260º, by oxidation with HNO₃, with the addition, if necessary , of nitrous gases and perhaps O₂ or gases containing it. The concentration of the HNO₃ is maintained >60% by weight (preferably >75%). Based on the total amount of H₂O present in the reaction mixture, the oxidation being carried out at temperatures <100º (preferably <70º). The operation may be carried out under raised pressure in the presence of catalysts and solvents.