高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (10): 1425-1428.

• 论文 • 上一篇    下一篇

胺类萃取机理的探讨

高宏成, 沈兴海, 吴杰   

  1. 北京大学技术物理系, 北京, 100871
  • 收稿日期:1994-03-14 修回日期:1994-05-11 出版日期:1994-10-24 发布日期:1994-10-24
  • 通讯作者: 高宏成,男,56岁,教授.
  • 作者简介:高宏成,男,56岁,教授.
  • 基金资助:

    国家自然科学基金

The Study of Extraction Mechanism with Amine

GAO Hong-Cheng, SHEN Xing-Hai, WU Jie   

  1. Department of Technical Physics, Peking University, Beijing, 100871
  • Received:1994-03-14 Revised:1994-05-11 Online:1994-10-24 Published:1994-10-24

摘要: 从胺类萃取剂在有机相中生成反向胶束和微乳液的角度提出了新的萃取机理,较好地解释了胺类萃取过程中的若干现象和规律。

关键词: 反向胶束, 溶剂萃取,

Abstract: In this paper through studying the extraction of uranium(Ⅵ)with some of amine, we have suggested and proved a new extraction mechanism of amine.The extraction reaction processes are considered in terms of the following steps:(1)The aggregation of ammonium salt and formation of reversed micelle in the extraction organic phase(see Eqn.1).(2)Metal ion Minteracts with monomeric amine to give an extraction complex(see Equ. 2).(3)The solubilization of extraction complex by the reversed micellar pseudophase(see Eqn.3).The distribution ratio Dof uranium can be described with Eqn.4.If the extraction complex does not bind significantly to the reversed micelle, i. e.Kc≈0 and Eqn. 4 reduces to:lgD = lgKc+ylg[N]。Therefore, under these conditions, a plot of lgD versus ylg[N]。 has a slope of y, y is the number of molecules of amine extractant in extraction complex.In the second case, the ex traction complex interacts very strongly with the reversed micelles, i.e.Ks has a high val ue, therefore, Eqn.4 can be approximated as D=constant·Cslg Cs, gives a slope of unity, i.e.Dhas a first order dependence on the concentration of mi cellized surfactant.Thus in this case the formation of extraction complex is not confirmed by the usual slope method.According to the new extraction mechanism, our experimental data and those results in literatures can be given a satisfactory explanation.

Key words: Reversed micelle, Solvent extraction, Uranium