Separation and Concentration of Lanthanoids Using Microcapsules Containing Acidic Organophosphorus Compounds as an Extractant
Separation and Concentration of Lanthanoids Using Microcapsules Containing Acidic Organophosphorus Compounds as an Extractant
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以酸性有机磷化合物微胶囊为萃取剂分离浓缩镧系元素
DOI：
10.1252/jcej.35.574
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发表时间：
2002
影响因子：
0.8
通讯作者：
Kazuo Kondo
中科院分区：
文献类型：
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作者：
Eiji Kamio;Kazuo Kondo
在本研究中，我们测量了以酸性有机磷化合物作为萃取剂的微胶囊对镧系元素的萃取平衡，并讨论了使用填充有微胶囊的柱对它们的相互分离。阐明了镧系元素在2-乙基己基膦酸单-2-乙基己酯(EHPNA)微胶囊中的萃取平衡，并通过斜率分析法计算了萃取平衡常数。表明微胶囊中的镧系元素离子在高负载状态下被萃取。此外，观察了填充有EHPNA的微胶囊的柱中镧系元素的吸附行为。研究发现，通过选择进料水溶液的pH值可以简单地实现镧系元素的吸附和洗脱。然而，仅通过吸附或洗脱操作不可能将它们分离。因此，利用与含有微胶囊的展开柱连接的吸附柱来研究镧系元素的相互分离。通过选择洗脱液的pH值，各金属以95%以上的纯度相互分离。来自开发柱的洗脱液中的金属离子可以通过用填充有二(2-乙基己基)磷酸(D2EHPA)的微胶囊的柱处理来浓缩。考虑到这些信息，将有可能设计使用填充有微胶囊的柱对镧系元素进行连续萃取、分离和浓缩的反应器。
In this study, we measured the extraction equilibria of lanthanoids with microcapsules containing acidic organophosphorus compound as an extractant and discuss their mutual separation by using a column packed with the microcapsules. The extraction equilibria of lanthanoids into the microcapsules containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPNA) were elucidated and the extraction equilibrium constants were calculated by slope-analysis method. It was suggested that the lanthanoid ions are extracted in the microcapsules in a high loading state.Furthermore, the adsorption behavior of lanthanoids into the column packed with the microcapsules containing EHPNA was observed. It was found that adsorption and elution of lanthanoids are briefly achieved by selecting pH of the feed aqueous solution. However, it was impossible to separate them only in adsorption or elution operation.So, the mutual separation of lanthanoids was investigated using the adsorption column connected to the development column containing microcapsules. By selecting pH of the eluent, each metal was separated mutually in more than 95% of purity. The metal ions in the eluent from the development column could be concentrated by treating it with a column packed with the microcapsules containing di(2-ethylhexyl)phosphoric acid (D2EHPA).Considering these information, it will be possible to design a continuous extracting, separating and concentrating reactor of lanthanoids using a column packed with the microcapsules.
Hiroshi Tsukube：J. C. S. Chem。
DOI：
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