FIELD: industrial organic synthesis. SUBSTANCE: invention, in particular, relates to obtaining diacids or diacid mixtures from peroxide-containing aqueous solutions formed when washing cyclohexane oxidation products. Wash water is first fried, at least partially, from peroxides by subjecting them to catalytic hydrogenation at temperature 0 to 100 C in presence of heterogeneous catalyst including at least one platinum group metal. Peroxide-free products are then oxidized with nitric acid and adipic acid is recovered by cooling and crystallization. Mother solution is evaporated to dry and crystals of other diacids, for example glutaric, succinic acids or their mixtures, are obtained. EFFECT: simplified technology and increased purity of products. 13 cl, 3 ex
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