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A Study on the application of ${it N,N}$-dialkylamides as extractants for U and Pu by continuous counter-current extractors

連続向流抽出器におけるU及びPuの抽出剤としての${it N,N}$-ジアルキルアミドの適用に関する研究

伴 康俊; 宝徳 忍; 津幡 靖宏; 筒井 菜緒; 松村 達郎

Ban, Yasutoshi; Hotoku, Shinobu; Tsubata, Yasuhiro; Tsutsui, Nao; Matsumura, Tatsuro

${it N,N}$-ジ(2-エチルヘキシル)-2,2-ジメチルプロパンアミド(DEHDMPA)、${it N,N}$-ジ(2-エチルヘキシル)ブタンアミド(DEHBA)及びこれらの劣化生成物のZr, Mo, Ru, Rh, Pd及びUに対する一段のバッチ抽出試験を行い、劣化生成物はいずれの金属元素も抽出しない結果を得た。さらに、連続向流プロセスにおけるDEHDMPA及びDEHBAのU及びPuに対する分離能力を計算コードで評価すると共に、UフラクションにおけるU及びU-PuフラクションにおけるU及びPuの濃度の実験値と計算値がほぼ同じ値を示すことを確認した。これらの結果は分離プロセスにおける抽出剤としてのDEHDMPA及びDEHBAの適用性、並びにプロセスの分離能力の評価における計算コードの有用性を支持している。

Extraction properties of ${it N,N}$-di(2-ethylhexyl)-2,2-dimethylpropanamide (DEHDMPA), ${it N,N}$-di(2-ethylhexyl)butanamide (DEHBA), and some of their degradation products for the metal elements Zr, Mo, Ru, Rh, and Pd were studied using a single-stage batch method, and the results showed that the degradation products barely extracted these metal elements. Furthermore, separation performance of DEHDMPA and DEHBA for U and Pu in a continuous counter-current process was evaluated using a calculation code, and it was confirmed that the calculated values of U concentration in the U fraction and U and Pu concentrations in the U-Pu fraction were similar to those measured experimentally. These results supported the applicability of DEHDMPA and DEHBA as extractants for separation processes and the validity of the calculation code for estimating the separation performance of the process.

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