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Sakamoto, Atsushi; Kibe, Satoshi*; Kawanobe, Kazunori*; Fujisaku, Kazuhiko*; Sano, Yuichi; Takeuchi, Masayuki; Suzuki, Hideya*; Tsubata, Yasuhiro; Ban, Yasutoshi; Matsumura, Tatsuro
JAEA-Research 2021-003, 30 Pages, 2021/06
JAEA-Research-2021-003.pdf:1.81MB
Japan Atomic Energy Agency has been developing a solvent extraction process called SELECT to recover minor actinides (MA) from spent nuclear fuel. In the SELECT process, TDdDGA, HONTA, and ADAAM are used as the extractants for MA + Ln corecovery, MA/Ln separation and Am/Cm separation, respectively. These extractants do not contain phosphorus (P), and consist of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N). In this study, in order to give beneficial information for designing flowsheet, the mass transfer coefficients of Ln between HNO
solution and TDdDGA or HONTA / n-dodecane solvent were evaluated by the single drop technique. Prior to the evaluation of mass transfer coefficient, we had optimized the structure of the single drop apparatus to improve accuracy of the measurement. Based on the mass transfer coefficients obtained in HNO / TDdDGA-n-dodecane system, Ln behaviors in the counter-current extraction and back-extraction using mixer-settlers and centrifugal contactors were estimated by simple calculation, and they had a good agreement with our previous experimental results. We also confirmed the mass transfer coefficients of Ln in HNO / HONTA - n-dodecane system are under 10
m/s.
Seki, Miharu*; Oikawa, Junichi*; Taguchi, Taro*; Onuki, Toshihiko; Muramatsu, Yasuyuki*; Sakamoto, Kazunori*; Amachi, Seigo*
Environmental Science & Technology, 47(1), p.390 - 397, 2013/01
Times Cited Count：44 Percentile：75.34(Engineering, Environmental)The laccase released by microorganisms oxidizes iodide to molecular iodine or hypoiodous acid, both of which are easily incorporated into natural soil organic matter.
Takahashi, Koji; Ishitsuka, Etsuo; Moeller, C. P.*; Hayashida, Kazunori*; Kasugai, Atsushi; Sakamoto, Keishi; Hayashi, Kenichi*; Imai, Tsuyoshi
Fusion Engineering and Design, 66-68, p.473 - 479, 2003/09
Times Cited Count：11 Percentile：59.38(Nuclear Science & Technology)For the purpose to confirm the reliability of the front steering concept, tests of the front steering launcher mock-up and neutron irradiation tests of bearings for a movable mirror were carried out under the ITER conditions. The max. stress of the flexible pipes for the movable mirror was measuerd to be 60MPa, much less than the allowable stress and agree with the calculation. No degradation on the performance of bearings was obtained for the assumed fluence of ITER. The mock-up of remote steering(RS) launcher was tested and RF radiation of 0.5MW-3sec and 0.2MW-10sec over 0-10
were performed. No degradation was obseved, either. The new launcher which has the capability of wider range rf beam steering and the corrugated square waveguide with four miter bends that yield the dog-legged structure has been designed, based on the test results. It has been fabricating for high power experiments.
Sano, Yuichi; Kawanobe, Kazunori*; Sakamoto, Atsushi; Kofuji, Hirohide; Takeuchi, Masayuki; Suzuki, Hideya; Matsumura, Tatsuro
no journal, ,
Japan Atomic Energy Agency (JAEA) has developed several new extractants which are significantly effective in trivalent minor actinides (MA(III)) recovery from high acidic media such as high level liquid waste (HLLW). In order to design an efficient MA(III) recovery process using these new extractants, it is important to obtain their kinetic data as well as equilibrium ones in the solvent extraction system. In this study, mass transfer coefficients of trivalent lanthanides (Ln(III)), which are surrogates of MA(III), between HNO solution and tetra dodecyl diglycol amide (TDdDGA) or hexa octyl nitrilo triacetic amide (HONTA) / n-dodecane solvent were evaluated by the single drop technique and Nitsch cell tests. The mass transfer coefficients of Ln(III) back-extraction in HNO / TDdDGA system were relatively smaller than those in the extraction step, but they could be improved by the addition of 2-ethyl-1-hexanol into the TDdDGA / n-dodecane solvent. The mass transfer of Ln(III) between HNO solution and HONTA/n-dodecane solvent was considerably slower than that between HNO solution and TDdDGA / n-dodecane solvent. Based on the mass transfer coefficients obtained in these evaluations, process conditions for MA(III) recovery using mixer-settlers and centrifugal contactors were discussed.
Asano, Shusaku*; Maki, Taisuke*; Mae, Kazuhiro*; Sano, Yuichi; Kawanobe, Kazunori*; Sakamoto, Atsushi; Okamura, Nobuo; Watanabe, Masayuki; Suzuki, Hideya; Matsumura, Tatsuro
no journal, ,
Mass transfer coefficients in solvent extraction processes using new extractants developed for MA recovery were evaluated using microdevice. It could reduce the amount of solution drastically for evaluating mass transfer coefficients compared to existing evaluation methods using Nitsch cell etc.
Sakamoto, Atsushi; Kawanobe, Kazunori*; Sano, Yuichi; Okamura, Nobuo; Watanabe, Masayuki; Suzuki, Hideya; Matsumura, Tatsuro
no journal, ,
no abstracts in English
Sano, Yuichi; Sakamoto, Atsushi; Takeuchi, Masayuki; Suzuki, Hideya*; Matsumura, Tatsuro; Kawanobe, Kazunori*; Asano, Shusaku*; Maki, Taisuke*; Mae, Kazuhiro*
no journal, ,
The mass transfer coefficients during the extraction and back-extraction of lanthanide elements in the solvent extraction process using new extractants (TDdDGA, HONTA) developed for minor actinides (MA) recovery were evaluated. In the TDdDGA system, it was confirmed that the mass transfer coefficients during back extraction were improved by the addition of alcohol to the solvent, etc., and in the HONTA system, the mass transfer coefficients were relatively small.
