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

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

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.