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Journal Articles

Improvement in flow-sheet of extraction chromatography for trivalent minor actinides recovery

Watanabe, So; Senzaki, Tatsuya; Shibata, Atsuhiro; Nomura, Kazunori; Takeuchi, Masayuki; Nakatani, Kiyoharu*; Matsuura, Haruaki*; Horiuchi, Yusuke*; Arai, Tsuyoshi*

Journal of Radioanalytical and Nuclear Chemistry, 322(3), p.1273 - 1277, 2019/12

 Times Cited Count:0 Percentile:0.01(Chemistry, Analytical)

Journal Articles

Extraction mechanism of lanthanide ions into silica-based microparticles studied by single microparticle manipulation and microspectroscopy

Otaka, Toshiki*; Sato, Tatsumi*; Ono, Shimpei; Nagoshi, Kohei; Abe, Ryoji*; Arai, Tsuyoshi*; Watanabe, So; Sano, Yuichi; Takeuchi, Masayuki; Nakatani, Kiyoharu*

Analytical Sciences, 35(10), p.1129 - 1133, 2019/10

 Times Cited Count:0 Percentile:0(Chemistry, Analytical)

Oral presentation

Analysis of Eu transfer between single polymer-immobilized porous silica microparticles containing phosphorous extractant and solution by microspectroscopy

Otaka, Toshiki*; Sato, Tatsumi*; Nakatani, Kiyoharu*; Nagoshi, Kohei*; Abe, Ryoji*; Arai, Tsuyoshi*; Watanabe, So; Sano, Yuichi; Takeuchi, Masayuki

no journal, , 

no abstracts in English

Oral presentation

Optimization in flow-sheet of extraction chromatography with CMPO and HDEHP impregnated adsorbents

Watanabe, So; Senzaki, Tatsuya; Shibata, Atsuhiro; Nomura, Kazunori; Nakatani, Kiyoharu*; Horiuchi, Yusuke*; Arai, Tsuyoshi*; Matsuura, Haruaki*

no journal, , 

no abstracts in English

Oral presentation

Improvement in flow-sheet of extraction chromatography for trivalent minor actinides recovery

Watanabe, So; Senzaki, Tatsuya; Shibata, Atsuhiro; Nomura, Kazunori; Takeuchi, Masayuki; Nakatani, Kiyoharu*; Matsuura, Haruaki*; Horiuchi, Yusuke*; Arai, Tsuyoshi*

no journal, , 

no abstracts in English

Oral presentation

Development of a hybrid process combining solvent extraction / low pressure loss extraction chromatography for a reasonable MA recovery process

Sano, Yuichi; Arai, Tsuyoshi*; Nakatani, Kiyoharu*; Matsuura, Haruaki*; Kunii, Shigeru*

no journal, , 

JAEA has developed a hybrid process combining solvent extraction and low pressure loss extraction chromatography to achieve a reasonable MA(III) recovery process having superior safety and economy. In the solvent extraction, MA(III) is recovered with Ln(III) using inexpensive TBP extractants and centrifugal contactors having superior phase separation performance. In the extraction chromatography, MA(III) is separated from Ln(III) using specially designed adsorbents for low pressure loss. In this report, the outline of R&D program will be introduced.

Oral presentation

Kinetic analysis of extraction-back extraction of lanthanoid with tributyl phosphate in the cylindrical micro droplet/solution system

Kusano, Yuka*; Nakagawa, Ryogo*; Nagatomo, Shigenori*; Sano, Yuichi; Nakatani, Kiyoharu*

no journal, , 

The columnar cavities formed on the microelectrodes were filled with a tributyl phosphate extractant, immersed in a nitric acid solution, and irradiated with laser light on the columnar droplets, and the temporal changes in the luminescence intensity of the lanthanoid complex were tracked. The change with time was analyzed by a single exponential function, and the extraction and back-extraction rates were calculated. The mechanism of mass transfer was discussed kinetically from the viewpoints of diffusion inside and outside the droplet, interfacial reaction, etc.

Oral presentation

Hybrid process combining solvent extraction and low pressure loss extraction chromatography for a reasonable MA recovery, 1; Overview of R&D program

Sano, Yuichi; Arai, Tsuyoshi*; Nakatani, Kiyoharu*; Matsuura, Haruaki*; Kunii, Shigeru*

no journal, , 

We have been developing a hybrid process combining solvent extraction and low pressure loss extraction chromatography for recovering trivalent minor actinides (MA(III): Am, Cm), which will decrease the waste and have good safety and economic performances. In this presentation, the outline of R&D program and some recent results will be introduced.

Oral presentation

Hybrid process combining solvent extraction and low pressure loss extraction chromatography for a reasonable MA recovery, 3; Kinetic analysis of extraction/back extraction at high concentration of TBP by microspectroscopy

Kusano, Yuka*; Miyagawa, Akihisa*; Nagatomo, Shigenori*; Nakatani, Kiyoharu*; Sano, Yuichi

no journal, , 

We measured the concentration dependencies of TBP, nitric acid, and nitrate ion for extraction and back extraction rates of FP (Ln) in a single microdroplet/solution system by fluorescence microspectroscopy technique, and determined mass transfer coefficients at the oil/water interfaces. The mass transfer coefficients, influenced significantly by those concentrations, will be discussed in detail.

Oral presentation

Hybrid process combining solvent extraction and low pressure loss extraction chromatography for a reasonable MA recovery, 8; Evaluation of adsorption and elution rates using adsorbent for MA/Ln separation by microspectroscopy

Kuzure, Yoshiaki*; Miyagawa, Akihisa*; Nagatomo, Shigenori*; Nakatani, Kiyoharu*; Yoshida, Masaaki*; Nemoto, Shuhei*; Arai, Tsuyoshi*; Ambai, Hiromu; Hasegawa, Kenta; Sano, Yuichi

no journal, , 

Concentration dependencies of nitric acid, nitrate ion, and so on for the adsorption and elution rates (mass transfer coefficients) of FP (Ln) in silica adsorbent, carrying various NTAamide extractants, were measured in the single silica particle/solution system by fluorescence microspectroscopy. The adsorption and elution rates were improved by changing polymercoating conditions for the silica adsorbent granulated by the freeze-drying method. We will discuss the mass transfer coefficients influenced by the nitric acid and nitrate ionconcentrations.

Oral presentation

Nitrate ion and tributyl phosphate concentration dependence of europium extraction / back extraction rate in micro organic droplet / nitric acid solution system

Kusano, Yuka*; Miyagawa, Akihisa*; Nagatomo, Shigenori*; Nakatani, Kiyoharu*; Sano, Yuichi

no journal, , 

The solvent extraction / back-extraction process of europium with tributyl phosphate was kinetically analyzed from the microfluorescence measurement of micro organic droplets. From the rate constant dependence on nitric acid, nitrate ion, and tributyl phosphate concentrations, it was clarified that extraction is governed by the movement of europium with two nitrate ions at the organic-aqueous interface, and the quantitative relationship between the inverse extraction rate and these concentrations.

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