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濁度測定による${it N}$,${it N}$-ジアルキルアミド-硝酸系の二相分離に関する研究

A Study on two-phase separation in ${it N}$,${it N}$-dialkylamides-nitric acid systems by turbidity measurement

筒井 菜緒  ; 袴塚 保之; 伴 康俊  

Tsutsui, Nao; Hakamatsuka, Yasuyuki; Ban, Yasutoshi

${it N}$,${it N}$-ジアルキルアミド(モノアミド)は湿式再処理プロセスの開発において、PUREX法で用いられているリン酸-n-トリブチル(TBP)の代替抽出剤として提案されているが、これまで、硝酸とモノアミドとの二相分離の定量評価は行われていない。本研究では、濁度分析を用いてドデカンで希釈されたモノアミド(${it N}$,${it N}$-ジ(2-エチルヘキシル)ブタンアミド(DEHBA)及び${it N}$,${it N}$-ジ(2-エチルヘキシル)2,2-ジメチルプロパンアミド(DEHDMPA))と硝酸との二相分離特性を調べた。また、TBP-硝酸系の濁度も比較のため測定した。TBPの場合、硝酸濃度にかかわらず二相は速やかに分離した。DEHBAの場合、硝酸濃度が高いほど二相の分離は時間がかかった。DEHDMPA-硝酸系は、TBP-硝酸系やDEHBA-硝酸系に比べて相の分離に比較的長時間かかったが、分離時間は硝酸濃度によらなかった。

${it N}$,${it N}$-dialkylamides (monoamides) have been proposed as alternative extractants to tri-n-butyl phosphate (TBP) in the development of spent nuclear fuel reprocessing. Up to now, however, quantitative estimation of two-phase separation between nitric acid and monoamides has not been carried out. The property of two-phase separation between monoamides (${it N}$,${it N}$-di(2-ethylhexyl)-butanamide (DEHBA) and ${it N}$,${it N}$-di(2-ethylhexyl)-2,2-dimethylpropanamide (DEHDMPA)) and TBP diluted by dodecane and nitric acid were studied using by a turbidity analyzer. In the case of TBP, two-phase separation proceeded rapidly regardless of the nitric acid concentration. The time require for two-phase separation decreased with increasing the nitric acid concentration in the presence of DEHBA. It took relatively long time for two-phase separation in the DEHDMPA-nitric acid system compared with the other two systems, and the separation time was independent of the nitric acid concentration.

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