Extraction of actinides and selected fission products from nitric acid medium using long chain monoamides

A series of long chain disubstituted aliphatic amides have been prepared wi th different substituting groups and the extracting ability for U(VI), Th(T V) and some fission products like Am(III), Zr(IV); Eu(III) and Cs from nitr ic acid solutions has been studied. All results were compared with those ob tained by using TBP under the same conditions. All prepared amides exhibit higher U-Th separation factors than TBP. Distribution ratios of U(VI) as fu nction of nitric acid concentration, extractants concentration and salting- out agent have been measured by using N,N-dihexyloctanamide (DHOA) and N,N- dihexyl(2-ethyl)hexylhexanamide (DHEHA), which were chosen for further stud ies. The extraction behviour of U(VI), Th(IV) and Zr(IV) with gamma irradia ted DHOA, DHEHA and TBP in toluene from 3M HNO3 has been studied as a funct ion of absorbed doses. Back extraction of U(VI), Th(IV) and Zr(TV) from org anic phases was also studied.