| Project/Area Number |
62470150
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
物質生物化学
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| Research Institution | Tohoku University |
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Principal Investigator |
INOUE Yasushi Tohoku University, Faculty of Engineering, Department of Nuclear Engineering, Professor, 工学部, 教授 (60005858)
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| Co-Investigator(Kenkyū-buntansha) |
TOCHIYAMA Osamu Tohoku University, Faculty of Engineering, Department of Nuclear Engineering, As, 工学部, 助教授 (70005479)
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| Project Period (FY) |
1987 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1989: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥5,000,000 (Direct Cost: ¥5,000,000)
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| Keywords | Nuclear Fuel Reprocessing / High-level waste / Actinoids / Diisodecyl phosphoric acid / Neptunium / Americium / Acylpyrazolone / Solvent Extraction / 協同効果 / ベンゾイルピラゾロン / ベンジルオキシカルボニルピラゾロン / テトラデカノイルピラゾロン / テレフタロイルピラゾロン |
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| Research Abstract |
This research has been conducted to develop an efficient extraction system for transuranium elements. Since tetra- and hexavalent actinoids are readily extractable from nitric acid solutions by a number of extractants, the studies on reprocessing or waste processing have focused on the development of an efficient extraction system for trivalent actinoids and pentavalent neptunium. Critical survey of literatures conducted in this research showed that acidic or neutral (bidentate) organophosphorus compounds are so far better extractants for trivalent actinoids. Following this evaluation, diisodecyl phosphoric acid, which is one of the acidic organophosphorus compounds, were successfully applied to extract neptunium from high-level radioactive waste solutions. On the other hand, the possibility of using chelating agents in waste processing was examined with using several newly synthesized acylpyrazolone derivatives. Although these derivatives showed better extraction of Am(III) and Np(V) than other chelating extractants, they were not effective enough to extract actinoids from highly acidic waste solutions.
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