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Solvent extraction of uranium with ${it N}$,${it N}$-di(2-ethylhexyl)octanamide from nitric acid medium

${it N}$,${it N}$-ジ(2-エチルヘキシル)オクタンアミド(DEHOA)による硝酸溶液からのウランの溶媒抽出

筒井 菜緒; 伴 康俊; 佐川 浩; 石井 翔; 松村 達郎

Tsutsui, Nao; Ban, Yasutoshi; Sagawa, Hiroshi; Ishii, Sho; Matsumura, Tatsuro

${it N}$,${it N}$-ジ(2-エチルヘキシル)オクタンアミド(DEHOA)による硝酸溶液中のウランに対する単段のバッチ抽出試験を行い、U(VI)の分配比計算式として$${it D}_{rm U}$$ = 1.1$$[rm NO^{-}_{3}]^{1.6}_{rm aq}[{rm DEHOA}]^{2}_{rm org}$$を導出した。硝酸の分配についても評価を行い、分配比計算式として$${it D}_{rm H}$$ = 0.12$$[rm H^{+}]^{0.76}_{rm aq}[{rm DEHOA_{rm Free}}]_{rm H}$$を得た。さらに、DEHOAのU(VI)抽出の時間依存性及びU(VI)負荷容量評価のためのバッチ試験も行った。DEHOAによるU(VI)抽出は数分以内に抽出平衡に達し、DEHOAと硝酸の濃度がそれぞれ1.5及び3Mのときの負荷容量は0.71Mであった。

Solvent extraction of uranium from a nitric acid medium was performed with ${it N}$,${it N}$-di(2-ethylhexyl)octanamide (DEHOA) by a single-stage batch method, and the distribution ratio equation of U(VI) was derived as $${it D}_{rm U}$$ = 1.1$$[rm NO^{-}_{3}]^{1.6}_{rm aq}[{rm DEHOA}]^{2}_{rm org}$$. Furthermore, the nitric acid distribution was also evaluated, and the distribution ratio equation $${it D}_{rm H}$$ = 0.12$$[rm H^{+}]^{0.76}_{rm aq}[{rm DEHOA_{rm Free}}]_{rm H}$$ was obtained. Batch experiments to evaluate the time dependence of U(VI) extraction and the U(VI) loading capacity of DEHOA were also performed. It was revealed that U(VI) extraction by DEHOA reached an equilibrium state within a few minutes, and the loading capacity was 0.71 mol/dm$$^{3}$$ (M) when the concentrations of DEHOA and nitric acid were 1.5 and 3.0 M, respectively.

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パーセンタイル:84.03

分野:Chemistry, Multidisciplinary

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