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Distribution of U(VI) and Pu(IV) by ${it N,N}$-di(2-ethylhexyl)butanamide in continuous counter-current extraction with mixer-settler extractor

Ban, Yasutoshi ; Hotoku, Shinobu ; Morita, Yasuji 

The extraction properties of 1.5 mol/dm$$^{3}$$ (M) ${it N,N}$-di-(2-ethyl-hexyl)butanamide (DEHBA) diluted with ${it n}$-dodecane toward U(VI) and Pu(IV) were studied using a single stage batch method, and the distribution ratios toward U(VI) and Pu(IV) were, respectively, obtained as follows: ${it D}$ $$_{rm U}$$ = 1.4[NO$$_{3}$$ $$^{-}$$]$$^{1.6}$$[DEHBA$$_{rm free}$$]$$^2$$ and ${it D}$ $$_{rm Pu}$$ = 0.11[NO$$_{3}$$ $$^{-}$$]$$^{3.3}$$[DEHBA$$_{rm free}$$]$$^2$$. A continuous counter-current experiment with 1.5 M DEHBA as an extractant was performed using mixer-settler extractors. The ratios of U(VI) and Pu(IV) extracted by 1.5 M DEHBA in the U-Pu extraction step were more than 99.9%. The extracted Pu(IV) was back-extracted using 0.67 M nitric acid, and more than 97% of Pu(IV) in the feed was recovered in the Pu fraction. The present results indicated that DEHBA works as an extractant for mutual separation of U(VI) and Pu(IV) by adjusting the nitric acid concentration without using Pu(IV) reductants.

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Category:Chemistry, Multidisciplinary

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