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Improvement of the separation among rare earth elements in the synergistic extraction with neutral bidentate ligands.

Research Project

Project/Area Number 14540565
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 分離・精製・検出法
Research InstitutionHachinohe National College of Technology

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)

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)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2002: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsSolvent extraction / Synergistic effect / Rare earth elements / Neutral bidentate ligands / Separation factor / β-Diketone
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.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (5 results)

All 2003 2002 Other

All Journal Article (3 results) Publications (2 results)

  • [Journal Article] Synergistic Enhancement in the Extraction of Lanthanoids by LIX 51 and Bidentate Amines2003

    • Author(s)
      Shigeto Nakamura
    • Journal Title

      Solvent Extraction Research and Development, Japan 10

      Pages: 103-111

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Synergic Extraction of Lanthanoids by Mixtures of LIX 54 (High Molecular Weight β-Diketone) and Bidentate Neutral Amines2002

    • Author(s)
      Shigeto Nakamura
    • Journal Title

      Analytical Sciences 18

      Pages: 319-323

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Synergic Extraction of Lanthanoids by Mixtures of LIX 54 (High Molecular Weight 6-Diketone) and Bidentate Neutral Amines2002

    • Author(s)
      Shigeto Nakamura
    • Journal Title

      Analytical Sciences 18

      Pages: 319-323

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Shigeto Nakamura: "Synergistic Enhancement in the Extraction of Lanthanoids by LIX 51 and Bidentate Amines"Solvent Extraction Research and Development, Japan. 10. 103-111 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Shigeto Nakamura: "Synergic Extraction of Lanthanoids by Mixtures of LIX 54 (High Molecular Weight β-Diketone) and Bidentate Neutral Amines"Analytical Sciences. 18. 319-323 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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