摘要
利用恒界面池法研究了辛酰哌啶 (OP)甲苯溶液从硝酸介质中萃取铀酰的动力学。结果发现在恒定扩散条件下 ,速控步骤为在界面区域靠近水相一边的萃合物的生成反应 :UO2 (NO3) ++OP·HNO3(i) =UO2 (NO3) 2 ·OP(i) +H+。正、逆向反应的活化能分别为 :E+a =3.2 0kJ/mol和E- a =2 6 .2 5kJ/mol,萃取反应的热效应为ΔH =- 2 3.0 5kJ/mol。萃取过程形成了UO2 (NO3) 2 ·(OP)和UO2 (NO3) 2 ·(OP) 2 两种萃合物 。
The extraction kinetics of uranium(Ⅵ) from nitric acid solution with N-octanoylpiperidine (OP) in toluene was investigated by means of stationary interface stirring cell. The experimental results show that the extraction process may be controlled by the following interface reaction: UO 2(NO 3) ++OP·HNO 3(i) =UO 2(NO 3) 2·OP (i) +H +. The effects of temperature, acidity and extractant concentration on the extraction rate were also discussed.
出处
《核技术》
CAS
CSCD
北大核心
2002年第12期1051-1057,共7页
Nuclear Techniques
