Solvent extractions of nitric acid, uranium (VI) and thorium (IV) by N, N,'N', N'-tetrahexylsuccinylamide

摘要

A new kind of diamide N, N, N', N'-tetrahexylsuccinylamide (THSA) was syn- thesized, characterized and used for the extraction of HNO_3, U(VI) and Th (IV) in a diu- ent composed of 0.5 volume fraction 1, 2, 4-trimethy benzene (TMB) and 0.5 volume fraction kerosene (OK). Extraction distribution coefficients of U (VI) and Th (IV) as functions of aque- ous nitric acid concentration, extractant concentration, temperature and salting-out agent (LiNO_3) have been studied, and it is found that THSA as an extractant is superior to TBP for extraction of U(VI)and Th (IV).