Basic Research on Batchwise Multi-stage Extractions Using TODGA for Dy/Nd Separation

Sasaki, Yoshiyuki; Matsumiya, Masahiko; Tsuchida, Yusuke

doi:10.2116/analsci.20p129

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Recently, this method was widely reported by our group [26,27]. Although the batchwise multistage extraction method lacks the flow of aqueous and organic phases, it is advantageous since the experiment can be performed by one person with a small amount of sample solution and without the need of a special device such as a mixer settler.…”

Section: Introductionmentioning

confidence: 99%

Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Nomizu

Sasaki

Kaneko

et al. 2022

J Radioanal Nucl Chem

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We studied the stepwise formation constants (β) of water-soluble diglycolamide (DGA) and dioxaoctanediamide (DOODA) for the mutual separation of Ln in a solvent extraction system. TODGA (N,N,N',N'-tetraoctyl-diglycolamide) and DOODA(C8) (N,N,N',N'tetraoctyl-dioxaoctanediamide) exhibit opposite behaviors in extracting both light and heavy Ln through Ln-patterns. Metal complexes of two-and three-folding with watersoluble DOODA and DGA, respectively, were found, and each β value was calculated using distribution ratios. Taking β, their distribution ratio, D, and separation factor, SF, values into consideration, the suitable separation conditions (aqueous phase: 30 mM DOODA(C2) in 1 M HNO3; organic phase: 0.1 M TODGA in n-dodecane

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Section: Introductionmentioning

confidence: 99%

Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Nomizu

Sasaki

Kaneko

et al. 2022

J Radioanal Nucl Chem

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“…[21][22][23][24] Recently, there have been reports on the solvent extraction studies concerning Craig's method. [25][26][27] The advantages of batchwise multistage extraction are that small volumes of sample solutions are accessible and experiments can be performed by one person. The disadvantages are that the experiments are complicated and it is not a flow system, which sets in apart from mixer-settler works.…”

Section: Introductionmentioning

confidence: 99%

Separation of Light and Middle Lanthanides Using Multistage Extraction with Diglycolamide Extractant

2021

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We investigated the chemical behavior of lanthanides (Ln) by multistage extraction. Using 10 aqueous phases with Ln and 3 organic phases, we drew the breakthrough curves for light and middle Ln. Our study reveals that the limit of metal extraction depends on their D values and the metal concentration employed in experiments. From the multistage extractions of 15 stage aqueous phases and 15 stage organic phases, three curves (extraction curves, back-extraction curves, and separation curves) were obtained. Setting appropriate conditions, adequate separation of light Ln from middle ones can be achieved. As an example, under the condition of the separation curve experiment (aqueous phase: 0.5 M HNO3, organic phase: 0.1 M TDDGA (N,N,N′,N′-tetradecyl-diglycolamide) in n-dodecane), the recovery of more than 99% of Sm in the organic phase with less than 1% of Nd can be obtained, even in the case of two metals adjacent to each other in the Ln series.

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“…Solvent extraction, or liquid-liquid extraction, is among the most promising techniques for recovering and separating metal ions, [8][9][10] including REEs. 11,12 This technique has been broadly employed in many fields, including hydrometallurgy, analytical chemistry, and nuclear fuel reprocessing. However, solvent extraction methods generally require water-immiscible solvents, such as hydrophobic organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Ionic Liquid Extraction for the Separation of Rare Earth Elements

Okamura

Hirayama

2020

ANAL. SCI.

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This review summarizes recent progress in solvent extraction of rare earth elements (REEs) using an ionic liquid (IL) as the extraction solvent. These IL extraction systems are advantageous owing to the affinity of ILs for both charged and neutral hydrophobic species, in contrast to conventional organic solvent extraction systems. Herein, REE extraction studies using ILs are detailed and classified based on the type of extraction system, namely extraction using anionic ligands, extraction using neutral ligands, synergistic extraction, extraction without extractants, and a specific system using task-specific ionic liquids (TSILs). In IL extraction systems, the extracted complexes are often different from those in organic solvent systems, and the REE extraction and separation efficiencies are often significantly enhanced. Synergistic IL extraction is an effective approach to improving the extractability and separability of REEs. The development of novel TSILs suitable for IL extraction systems is also effective for REE separation.

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Basic Research on Batchwise Multi-stage Extractions Using TODGA for Dy/Nd Separation

Cited by 7 publications

References 29 publications

Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Complex formation of light and heavy lanthanides with DGA and DOODA, and its application to mutual separation in DGA–DOODA extraction system

Separation of Light and Middle Lanthanides Using Multistage Extraction with Diglycolamide Extractant

Recent Progress in Ionic Liquid Extraction for the Separation of Rare Earth Elements

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