Extraction of actinides and fission products by the new ligand, N,N,N',N'-tetraoctyl-3, 6-dioxaoctanediamide

Sasaki, Yuji  ; Morita, Yasuji  ; Kitatsuji, Yoshihiro  ; Kimura, Takaumi 

New reagent, N,N,N',N'-tetraoctyl-3, 6-dioxaoctanediamide (DOODA-C8), was synthesized and examined for the actinide and fission product extractions. DOODA can be synthesized from 3, 6-dioxaoctanedioic acid and the secondary amine, which has two ether and carbonyl oxygen atoms in the central frame and may show a multidentate feature. DOODA-C8 can be dissolved well in n-dodecane, which suggests a potential to use in the partitioning process for high-level radioactive liquid waste. Extraction from nitric acid solution was studied and it was found that DOODA can extract U, Pu, Am, lanthanides (Ln) and Tc. The D values of Fe, Pd and Zr, which are easy to form the third phase during multi-stage extractions, indicate the weak-complexation with DOODA. Therefore, the aqueous condition for the partitioning process can be set up in the absence of their masking agents.