Am and Eu Stripping by Bistriazol Pyridine Nitric Acid Solution From TODGA

The water-soluble 2,6-bis［1-(hydroxypropyl)-1H-1,2,3-triazol-4-yl］pyridine(PTD) was synthesized. The stripping behaviors of Am and Eu by PTD with TODGA as extractant, TBP as phase modifier and n-dodecane as diluent were studied. The effects of contact time, PTD concentration, initial nitric acid concentration and temperature on the distribution ratio of Am and Eu were studied. The results show that Am and PTD form 1∶1 and 1∶2 complex, Eu and PTD form 1∶1 complex. Both stripping reaction of Am and Eu by PTD are endothermic processes. When the concentration of stripping nitric acid is less than 0.7 mol/L, PTD can realize the stripping separation of Am and Eu in TODGA.