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Specific features of decomposition of hydroxamic acids in two-phase nitric acid systems with alcohols and TBP, as applied to 99Mo stripping

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Hydrolysis is the prevalent mechanism of decomposition of benzo- and caprinohydroxamic acids (HAs) in nitric and perchloric acid solutions and in the equilibrium organic phase based on heptanol, decanol, and 30% TBP in С13 paraffin diluent. In the nitric acid system with alcohols, HAs undergo autocatalytic oxidation at temperatures raised over 50°С. In the case of BHA, the process occurs in both phases taken separately and on their mixing. In the case of caprinohydroxamic acid poorly soluble in HNO3 solutions, the autocatalytic process occurs only at 70–80°С on mixing the phases; it tends to fade as the phase ratio n = О/A is increased from 1 to 10. This trend determines the conditions for Mo stripping in this system. In the practice of the 99Mo production, the stripping efficiency can be increased by repeated contact with the addition of non-salt complexing agents (H2O2, H2C2O4, CH3CONHOH) into the system.

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Correspondence to A. A. Naumov.

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Original Russian Text © A.A. Naumov, N.D. Goletskii, B.Ya. Zilberman, A.A. Murzin, 2017, published in Radiokhimiya, 2017, Vol. 59, No. 6, pp. 525–533.

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Naumov, A.A., Goletskii, N.D., Zilberman, B.Y. et al. Specific features of decomposition of hydroxamic acids in two-phase nitric acid systems with alcohols and TBP, as applied to 99Mo stripping. Radiochemistry 59, 596–606 (2017).

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