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The alkyl derivatives of  N , N ,-dialkyl-2-hydroxyacetamide (DAHyA), namely,  N , N ,-dihexyl-2-hydroxyacetamide (DHHyA),  N , N ,-dioctyl-2-hydroxyacetamide (DOHyA),  N , N ,-didecyl-2-hydroxyacetamide (DDHyA), were synthesized and characterized by FT-IR, and NMR spectroscopy. The extraction behaviour of Am(III) in a solution of DAHyA in  n -dodecane was studied as a function of various parameters to evaluate the feasibility of using DAHyA for partitioning of trivalent actinides from high-level liquid waste (HLLW). The distribution ratio of Am(III) ( D  Am(III) ) in 0.1 M DAHyA/ n -DD increased from 10 −4  to &gt; 200 with increase in nitric acid concentration from 1 M to 6 M. A  D  Am(III)  value 10–70 was obtained in a nitric acid concentration range from 3–4 M. The extraction of Am(III) in 0.1 M DAHyA/ n -dodecane decreased in the order DHHyA &gt; DOHyA &gt; DDHyA. The third-phase formation behaviour of nitric acid and neodymium (III) in 0.2 M DAHyA/ n -dodecane was studied. Near stoichiometric amount of neodymium (III) can be loaded in octyl and decyl derivatives without any third-phase formation from 3–4 M nitric acid medium. Unlike other extractants, the loaded trivalent metal ion in DAHyA can be recovered even with 1 M nitric acid. Therefore, the study revealed that  N , N ,-dialkyl-2-hydroxyacetamides are promising candidates for partitioning the trivalent actinides from HLLW.

N , N -dialkyl-2-hydroxyacetamides for modifier-free separation of trivalent actinides from nitric acid medium