中华医学超声杂志

应用化学 ›› 1990, Vol. 0 ›› Issue (2): 1-5.

• 研究论文 •    下一篇

甲基膦酸二(1-甲庚)酯萃取钪的机理

赵云岭, 李德谦   

  1. 中国科学院长春应用化学研究所稀土化学与物理开放实验室 长春 130022
  • 收稿日期:1989-07-07 修回日期:1989-10-09 出版日期:1990-04-10 发布日期:1990-04-10
  • 基金资助:
    国家自然科学基金

MECHANISM OF EXTRACTION OF SCANDIUM BY DI(1-METHYLHEPTYL)METHYL PHOSPHONATE

Zhao Yunling, Li Deqian   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Laboratory of Rare Earth Chemistry and Physics, Changchun 130022
  • Received:1989-07-07 Revised:1989-10-09 Published:1990-04-10 Online:1990-04-10

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摘要： 本文研究了甲基膦酸二(1-甲庚)酯(简称P350)的正庚烷溶液从盐酸溶液中萃取钪(Ⅲ)、HCl和H2O的机理。用斜率法确定了萃合物的组成为SoCl3·3P350和3HCl·2H2O·3P350。讨论了水相酸度、萃取剂浓度、温度对萃取平衡的影响,计算了反应的浓度平衡常数及热力学函数。研究了萃合物的红外光谱。

关键词: 甲基膦酸二(1-甲庚)酯, 萃取, 钪, 机理

Abstract: Mechanism extraction of Sc(Ⅲ)from hydrochloric acid solution by di(1-methylheptyl)methyl phosphonate(abbreviated as P350)in hoptane has been studied. The composition ofthe complex was determined to be ScCl-3.3P350 by the metbod of slope. The extraction rea-ction can be expressed as:Sc3++3Cl- + 3P350(o)⇔ScCl3.3P35(o)The HCl and H2O were extracted as 3HCl.2H2O.3P350 likely through the reaction: 3H+3Cl-2H2O+3P350(o)⇔3HCl.2H-2O.3P350(o) The effects of concentration of HCl, extractant and temperatures on the exraction equi-librium were discussed in detail. The equilibrium constant(Kex)and the thermodynamicfunctions(△Ho, △So, and △Go)of the extraction reaction were calculated.

Key words: di(methylheptyl)methyl phosphonate, extraction, scandium, mechanism

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