2004 Fiscal Year Final Research Report Summary
Improvement of the separation among rare earth elements in the synergistic extraction with neutral bidentate ligands.
| Project/Area Number |
14540565
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
分離・精製・検出法
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| Research Institution | Hachinohe National College of Technology |
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Principal Investigator |
NAKAMURA Shigeto Hachinohe National College of Technology, Department of Chemical and Biological Engineering, Associate Professor, 物質工学科, 助教授 (90180364)
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| Co-Investigator(Kenkyū-buntansha) |
WAKAMATU Yoshinobu Hachinohe National College of Technology, Department of Liberal Arts and Engineering Sciences, Professor, 総合科学科, 教授 (80042133)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Solvent extraction / Synergistic effect / Rare earth elements / Neutral bidentate ligands / Separation factor / β-Diketone |
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| Research Abstract |
The synergistic extraction of metal ions with an acidic chelating reagent and a neutral ligand has been widely investigated. It is generally concluded that although the extraction efficiency is greatly improved, the separation efficiency becomes poor in the synergistic extraction. On the other hand, the enhancement of the separation efficiency has been found in the synergistic extraction with the specific combination of an acidic reagent and a bidentate neutral ligand, but only a few extraction systems with the similar phenomenon has been reported. The present project dealt with the synergistic extraction system of rare earth elements (REs) having higher separation efficiency in the new combination of β-diketones and bidentate neutral ligands.
In the synergistic extraction of REs with a β-diketone containing a trifluoromethyl group, 2-thenoyltrifluoroacetone (Htta), large synergistic enhancement was observed by the addition of a diketonedioxime derivative which has not been almost researched in synergistic extraction, and the separation among some REs was improved. The synergism with a high molecular weight β-diketone having the trifluoromethyl group, LIX 51, was also investigated.
A high molecular weight β-diketone containing no halogen atom, such as dibenzoylmethane(Hdbm) and LIX 54 was used as an acidic reagent with little soluble loss to the aqueous phase. In the synergistic extraction of REs with Hdbm in the presence of diphenyl and dimethyl derivatives of 1,10-phenanthroline, the synergistic effect roughly increased with the atomic number of the light-to-middle REs, and decreased with a further increase in the atomic number of the heavy REs. The influence of the substituent of the neutral ligand is small. The separation factor among light REs is larger than that in the extraction with di-2-ethylhexylphosphoric acid (D2EHPA), which is well known as one of the extractant giving the largest separation factor among REs.
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Research Products
(3 results)
