Crown ethers as synergistic agents in the solvent extraction of trivalent lanthanoids with thenoyltrifluoroacetone

被引：32
作者：
Atanassova, M [1 ]
Dukov, IL [1 ]
机构：
[1] Univ Chem Technol & Met, Sofia 1756, Bulgaria
来源：
SEPARATION SCIENCE AND TECHNOLOGY | 2005年 / 40卷 / 05期
关键词：
synergistic extraction; thenoyltrifluoroacetone; dibenzo-24-crown-8; dibenzo-18-crown-6; lanthanoids separation factors;
D O I：
10.1081/SS-200049855
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The solvent extraction of trivalent lanthanoids (without Pm) with thenoyltrifluoroacetone (HTTA) and dibenzo-18-crown-6 (DB18C6) or dibenzo-24-crown-8 (DB24C8) has been studied. It was found that in the presence of a crown ether (S) the lanthanoids have been extracted as Ln(TTA)(3) (.) S. On the basis of the experimental data, the values of the equilibrium constants have been calculated. It was established that the stability of the complexes involving DB24C8 is higher than those involving DB18C6. The influence of the synergistic agent on the extraction process has been discussed. The synergistic and separation factors have been determined too.
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页码：1103 / 1113
页数：11
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