双三唑吡啶硝酸溶液反萃TODGA中的Am和Eu

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

摘要: 合成了水溶性的2,6-二［1-(羟丙基)-1H-1,2,3-三唑-4-基］吡啶(PTD)，研究了以N,N,N′,N′-四辛基-3-氧杂戊二酰胺（TODGA）为萃取剂、正十二烷为稀释剂时，PTD对Am和Eu的反萃行为。研究了两相接触时间、PTD浓度、初始硝酸浓度和温度对Am和Eu分配比的影响。结果表明：Am与PTD形成1∶1型和1∶2型配合物，Eu与PTD形成1∶1型配合物； PTD反萃TODGA-TBP中Am和Eu的反应均为吸热过程。在PTD浓度一定的情况下，反萃硝酸浓度小于07 mol/L时，PTD可以实现TODGA中的Am与Eu的反萃分离。

Abstract: 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.