FIELD: industrial organic synthesis.
SUBSTANCE: invention relates to improved process for production of dicarboxylic acids useful for various applications, for example as additive to various products, in manufacture of concrete, as well as monomers in polymer production. Process consists of oxidizing cyclohexane with oxygen or oxygen-containing gas in presence of oxidation catalyst and lipophilic-type oxidation solvent. Process comprises stage of extraction of dicarboxylic acids formed in oxidation stage, which extraction stage consisting in performing liquid-phase extraction of diatomic acids with the aid of first extraction solvent, wherein at least oxidation solvent and cyclohexane are insoluble, said extraction being carried out in countercurrent liquid-liquid extraction column.
EFFECT: enhanced process efficiency due to efficient diacid extraction stage and complete oxidation solvent recycling.
15 cl, 2 ex
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