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• W2953643452 abstract "The use of tetra-alkylcarbamides as novel extractants for the separation of uranium(VI) and plutonium(IV) by solvent extraction from spent nuclear fuels is investigated in this study. Batch extraction experiments show that tetra-alkylcarbamides strongly extract U(VI) with high distribution ratios. Plutonium(IV) can be co-extracted with U(VI) at high nitric acid concentration, while high U(VI)/Pu(IV) selectivities can be reached at lower acidity. Loading capacity experiments with high uranium concentrations show that alkyl chains longer than butyl are necessary to avoid third phase formation. Nevertheless, the viscosity of uranium-loaded solvents gets too high with alkyl chains longer than pentyl. Overall, this study shows that with TPU extractant (with four pentyl chains), an efficient co-extraction of uranium and plutonium can be reached (DU,Pu > 1) for a concentration of nitric acid higher than 4 mol•L−1, while the partition between uranium(VI) and plutonium(IV) could be operated even at 2 mol•L−1 nitric acid without redox chemistry." @default.
• W2953643452 created "2019-07-12" @default.
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• W2953643452 date "2019-02-23" @default.
• W2953643452 modified "2023-10-18" @default.
• W2953643452 title "Extraction of Uranium(VI) and Plutonium(IV) with Tetra-Alkylcarbamides" @default.
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• W2953643452 doi "https://doi.org/10.1080/07366299.2019.1630095" @default.
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