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Hirayama, Mikiro; Nii, Susumu*; Naganawa, Hirochika; Nagano, Tetsushi
no journal, ,
We study an effect of a distribution of droplet and volume ratio (org./total) on iodine extraction characteristics for Emulsion Flow Column. As a result, it was cleared that over-all mass-transfer coefficient, easiness of extraction, varied for height of emulsion layer. It could be considered that a flow condition of droplet changed by the distribution influenced the mass-transfer characteristics.
Sasaki, Yuji; Ban, Yasutoshi; Morita, Keisuke; Matsumiya, Masahiko*; Ono, Ryoma*; Shiroishi, Hidenobu*
no journal, ,
Mutual separation technique of Dy and Nd in Nd magnet is noticed for the recycle of ranthanide elements. Both Dy and Nd belong to ranthanide elements, then the mutual separation is very hard. Lanthanide elements can be extracted thoroughly by diglycolamide (DGA) extractants, we use this reagent for the recovery and isolation of Dy. Tetradodecyl-DGA (TDdDGA) has relatively high separation factors (SF) between light and heavy ranthanides, this compound is useful for this purpose. In this work, the counter-current extraction using TDdDGA was applied for their separation, and the results will be discussed.
Tsutsui, Nao; Nakase, Masahiko*; Ito, Sayumi*; Matsumura, Tatsuro; Takeshita, Kenji*
no journal, ,
To separate minor acitinides from lanthanides in nitric acid, we focused on 1,10-phenanthroline-2,9-diamides (PTDAs) which consist of both soft and hard donor atoms. The present study employed a PTDA having dodecyl groups in N atoms of amides groups, TDdPTDA, and its extraction property toward Am, Cm, and Eu was studied.
Ito, Sayumi*; Tsutsui, Nao; Nakase, Masahiko*; Matsumura, Tatsuro; Takeshita, Kenji*
no journal, ,
We focused on 1,10-phenanthroline-2,9-diamides (PTDAs) for mutual separation of minor actinides (MAs) from lanthanides (Lns). PTDAs are hybrid-type ligands which consist of both soft N and hard O donors and show high extraction selectivity for MAs over Lns. They also have the symmetrical structures, and thus they are easy to synthesize. Furthermore, PTDAs have little detrimental effect on environment when they are incinerated. In this study, we synthesized novel PTDAs having phenyl groups and alkyl groups on the amide groups. The effectiveness of the novel PTDAs was evaluated from the viewpoint of extraction and separation properties of Lns and MAs.
Suzuki, Hideya; Tsubata, Yasuhiro; Matsumura, Tatsuro
no journal, ,
The Japan Atomic Energy Agency has been studying partitioning and transmutation systems. In this partitioning process, new extractants with highly practical and high extraction ability for minor actinoids was developed. New extractants, called NTAamide, were tested for mutual separation of trivalent minor actinoids and trivalent rare earth elements. Among the four NTAamides, hexaoctylnitrilotriacetamide (HONTA) provided the largest distribution ratio of trivalent americium, and was chosen. A continuous liquid-liquid extraction test was conducted using a multistage countercurrent mixer-settler extractor with HONTA. In this test, separation of MA(III) and RE(III) was achieved with very high yield.
Matsumura, Tatsuro; Ban, Yasutoshi; Hotoku, Shinobu; Suzuki, Hideya; Tsubata, Yasuhiro; Tsutsui, Nao; Morita, Keisuke; Toigawa, Tomohiro; Shibata, Mitsunobu*; Kurosawa, Tatsuya*; et al.
no journal, ,
no abstracts in English
Okamura, Hiroyuki; Nagano, Tetsushi; Naganawa, Hirochika
no journal, ,
A centrifugal contactor has been investigated as a promising extractor in the separation and purification process based on solvent extraction in the nuclear fuel reprocessing. However, there is a problem of being affected by sludge components such as undissolved residues. The emulsion flow method is based on the control of the generation and disappearance of a flow in an emulsified state in which an aqueous phase and an oil phase are mixed, and can actualize highly efficient and rapid solvent extraction. Therefore, this method has attracted much attention as an innovative technique. In this study, to develop innovative reprocessing technology for spent nuclear fuels by the emulsion flow method, we constructed a system integrating highly efficient solvent extraction of uranium and removal of sludge components from a nitric acid aqueous solution simulating reprocessing process. It was demonstrated that, by using the emulsion flow apparatus, uranium can be selectively extracted and back-extracted from the simulated solution for nuclear fuel reprocessing without being affected by sludge components, and part of sludge components can be removed.
Eguchi, Ayano; Okamura, Hiroyuki; Sugita, Tsuyoshi; Ueda, Yuki; Morita, Kotaro*; Shimojo, Kojiro; Naganawa, Hirochika; Hirayama, Naoki*
no journal, ,
Physical and chemical properties of ionic liquids (ILs) can be tuned by changing the combination of an anion and a cation. In the solvent extraction of metal ions, it is well known that the structure and alkyl chain length of the IL cation have a great effect on the extractability. However, the structural effect of the IL anion on the extractability is hardly clarified. In this study, the effect of the side chain length of the IL anion on the IL chelate extraction of trivalent lanthanoids using 2-thenoyltrifluoroacetone was investigated. Four 1-butyl-3-methylimidazolium bis(perfluoroalkanesulfonyl)imides with different side chain lengths (n = 1-4) were synthesized and used as extraction solvents. When using ILs which side chain lengths n were even (n = 2, 4), the extracted species were different from those when using ILs that n were odd (n = 1, 3) and the IL having hexafluorophosphate anion. It was, therefore, implied that the extracted species can be controlled by the side chain length of the IL anion.
Kobayashi, Toru; Suzuki, Shinichi; Shiwaku, Hideaki; Yaita, Tsuyoshi
no journal, ,
no abstracts in English
Simonnet, M.; Miyazaki, Yuji*; Suzuki, Shinichi; Kobayashi, Toru; Yaita, Tsuyoshi
no journal, ,