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Effect of functional groups in DGAA-type extractants on extraction performance

DGAA型抽出剤における官能基が及ぼす抽出能への影響

杉田 剛   ; 岡村 浩之   ; 長縄 弘親  ; 下条 晃司郎   

Sugita, Tsuyoshi; Okamura, Hiroyuki; Naganawa, Hirochika; Shimojo, Kojiro

溶媒抽出法の効率は抽出剤に依存するため、優れた抽出剤の開発が不可欠である。近年、我々は、アミド基とカルボキシ基をエーテル鎖で連結した構造を持つ抽出剤(DODGAA)を開発した。この抽出剤は単純な構造を持ちながら、様々な金属イオンに対して優れた抽出能を示す。本研究では、ジグリコールアミド酸(DGAA)型抽出剤の各官能基が及ぼす抽出特性への影響を調べるため、アミド基、エーテル鎖、酸性基をそれぞれ変えたDGAA型抽出剤を合成し、その金属イオン抽出挙動をDODGAAと比較した。

Efficiency of solvent extraction depends on the extractant. Therefore, a superior extractant is vital to effective extraction and separation by solvent extraction. Recently, we developed a N,N-dioctyldiglycolamic acid (DODGAA) with an amide group and a carboxy group connected by an ether chain. DODGAA has a simple molecular structure, but can show the excellent extraction performance for various metal ions. In this study, we investigated the effect of each functional group in the diglycolamic acid (DGAA)-type extractant on the extraction performance. To evaluate the effect of amide group, ether chain, and acid group, we synthesized some DODGAA analogous extractants, and compared the extraction properties between the DODGAA and the analogous extractants.

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