N,N,N’,N’-tetra-n-butylurea was synthesized by the means of “nonphosgene”.The extraction properties of dioxouranium(Ⅱ)from nitric acid solution by N,N,N’,N’-tetra-n-butylurea(TBU)were studied.The extraction laws of dioxouranium(Ⅱ)with TBU were similar to that with tributyl-phosphate(TBP).Its extracting ability was bitter lower than that of TBP.In the all experiment condition,the third phase doesn’t appear.Its solvation number to dioxouranium was 2.
