Am/Eu separation with a new ligand, N,N,N',N'-tetrakis((4-butoxypyridin-2-yl)methyl)ethylenediamine (TBPEN), a hydrophobic derivative of TPEN

Matsumura, Tatsuro; Inaba, Yusuke*; Mori, Atsunori*; Takeshita, Kenji*

Journal of Nuclear Science and Technology, 47(2), p.123 - 126, 2010/02

https://doi.org/10.3327/jnst.47.123

Licensable Patent Information Database

Patent publication (In Japanese)

We are developing a new MA/Ln separation process with TPEN and its derivatives for P&T technology. TPEN is a hexadentate soft-donor ligand that has six soft-donor sites as a kind of podand type molecule and can encapsulate a metal ion. TPEN has good selectivity of Am(III) from Ln(III) and has potential to establish partitioning of MA. From the viewpoint of practical application, the hydrophobicity of TPEN must be improved. Because the dissolution of a slight amount of TPEN (about 10 mol/l) to water will restrict decontamination of Ln in extraction process. In this study, the hydrophobicity of TPEN was improved by introducing alkyl groups and the effect of the introduction of alkyl groups on the separation of Am(III) and Eu(III) was examined. One of them, N,N,N',N'-tetrakis((5-butoxypyridin-2-yl)-methyl)ethylenediamine, TBPEN, showed good selectivity and the maximum separation factor, SF, was 91 at pH 3.02. The hydrophobicity of TBPEN is checked by the distribution data between water and chloroform, and improved successfully. The approach for development of hydrophobic derivatives of TPEN was effective.

-tetrakis((5-alkoxypyridin-2-yl)methyl)ethylenediamine, TRPEN, effective ligands for the separation of trivalent minor actinides from lanthanides

Matsumura, Tatsuro; Inaba, Yusuke*; Koma, Yoshikazu; Morita, Yasuji; Mori, Atsunori*; Takeshita, Kenji*

Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM), p.1107 - 1112, 2009/09

JP, 2007-210038   Licensable Patent Information Database   Patent publication (In Japanese)

no abstracts in English

MA/Ln separation with new ligand, hydrophobic derivatives of TPEN

Matsumura, Tatsuro; Takeshita, Kenji*; Mori, Atsunori*

Proceedings of 3rd International ATALANTE Conference (ATALANTE 2008) (CD-ROM), 4 Pages, 2008/05

JP, 2007-210038   Licensable Patent Information Database   Patent publication (In Japanese)

We are developing a new MA/Ln separation process with derivatives of TPEN (N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine) for P&T technology. TPEN is a hexadentate ligand, which has good selectivity of Am(III) from Ln(III). However, there is a serious problem for the practical application. This is to the dissolution of a slight amount of TPEN (about 10 mol/l) to water. High enrichment of Am(III) will be restricted by the dissolution of TPEN to water. In this study, the hydrophobicity of TPEN is improved by introducing alkyl groups and the selectivity of Am(III) and Eu(III) is examined. We succeeded to synthesize a new hydrophobic derivative of TPEN, TBPEN (N,N,N',N'-tetrakis((5-butoxypyridin-2-yl)-methyl)ethylenediamine. It showed good selectivity and the maximum separation factor, SF, was 91 at pH 3.0. A hydrophobic derivative of TPEN that has potential of application to the MA/Ln separation process was synthesized successfully.

MA/Ln separation by new ligand, hydrophobic derivative of TPEN, 4

Matsumura, Tatsuro; Takeshita, Kenji*; Mori, Atsunori*

no journal, , 

JP, 2007-210038   Licensable Patent Information Database   Patent publication (In Japanese)

no abstracts in English

Am(III)/Eu(III) separation with N,N,N',N'-tetrakis((5-alkoxypyridin-2-yl)methyl)ethylenediamine, Hydrophobic Derivatives of TPEN

Matsumura, Tatsuro; Inaba, Yusuke*; Takeshita, Kenji*; Mori, Atsunori*

no journal, , 

JP, 2007-210038   Licensable Patent Information Database   Patent publication (In Japanese)

no abstracts in English

Syntheses and properties of TPEN derivatives bearing hydrophobic side-chains as separating agent for minor actinides from high-level radioactive waste

Inaba, Yusuke*; Kida, Tatsuya*; Watanabe, Wataru*; Mori, Atsunori*; Matsumura, Tatsuro; Ogata, Takeshi*; Takeshita, Kenji*

no journal, , 

JP, 2007-210038   Licensable Patent Information Database   Patent publication (In Japanese)

Separation of minor actinides (MAs) from lanthanides in high-level radioactive waste (HLW) becomes important in nuclear power generation. Although TPEN is a possible candidate for the practical separating agent for MAs from HLW, there still remains difficulties in high water solubility and easy protonation characteristics. The practical MA separation is conducted from a mixture of MAs and Ln(III) in a highly acidic aqueous solution, thereby a hydrophobic and acid tolerant chelating agent needs to be developed. We herein report efficient syntheses of TPEN derivatives bearing various hydrophobic side-chains, which are alkyloxy and fluorinated alkoxy groups, and solvent extraction of Am(III) from Eu(III) in nitric acid aqueous solution. Synthesized TPEN derivatives were hydrophobic and showed higher performance than unsubstituted TPEN for Am separation from Eu in extraction with water/organic solvents at low pH region.