Technetium(VII) and rhenium(VII) extraction by a new diamide reagent, 2,2'-(Imino)bis(-dialkylacetamide) (IDAA)

Sasaki, Yuji  ; Sugo, Yumi; Saeki, Morihisa; Morita, Yasuji  ; Ohashi, Akira*

The new diamide-type extractant, 2,2-(Imino)bis(-dialkylacetamide) (IDAA), was developed for Tc recovery. IDAA has a nitrogen donor atom introduced into the center of backbone and shows the tridentate feature by hybrid donor atoms of two carbonyl oxygen and a nitrogen. 2,2-(Methylimino)bis(-Dioctylacetamide) (MIDOA), 2,2-(Methylimino)bis(-Didodecylacetamide) (MIDDA), and 2,2-(Imino)bis(-Didodecylacetamide) (IDDA), the IDAA derivatives, can be dissolved well in n-dodecane, and are readily used in the solvent extraction. In addition to Tc(VII) and Re(VII), Cr(VI), Mo(VI), W(VI), Pd(II) and Pu(IV) can be extracted from nitric acid to n-dodecane by these extractants, therefore IDAA has high extractability with some oxonium anions. The extraction capacity for Re(VII) was measured and more than 37 mM Re(VII) can be extracted by 0.1 M MIDOA.