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Journal Articles

2,2'-(Methylimino)bis($$N,N$$-dioctylacetamide) (MIDOA), a new tridentate extractant for technetium(VII), rhenium(VII), palladium(II), and plutonium(IV)

Sasaki, Yuji; Ozawa, Masaki; Kimura, Takaumi; Ohashi, Kozaburo*

Solvent Extraction and Ion Exchange, 27(3), p.378 - 394, 2009/05

https://doi.org/10.1080/07366290902821248
 Times Cited Count：37 Percentile：69.58(Chemistry, Multidisciplinary)

2,2'-(Methylimino)bis($$N,N$$-dioctylacetamide) (MIDOA) was developed as a new extractant for Tc-extraction. MIDOA has a similar backbone to TODGA, $$N,N,N',N'$$-tetraoctyl-diglycolamimde, the nitrogen atom bonded with methyl group is introduced, instead of ether oxygen in TODGA. MIDOA has a high lipophilic property and is ready to use in the HNO$$_{3}$$-${it n}$-dodecane extraction system. Tc(VII), Cr(VI), Re(VII), Mo(VI), W(VI), Pd(II) and Pu(IV) are well-extracted by MIDOA. The ${it D}$(Tc) values decrease gradually with HNO$$_{3}$$, H$$^{+}$$, and NO$$_{3}$$$$^{-}$$ concentrations, and log ${it D}$ vs. log [MIDOA] relation supports the species extracted to be 1:1 metal-ligand complex. It is clear that MIDDA (2,2'-(Methylimino)bis($$N,N$$-didodecylacetamide)) and IDDA (2,2'-(Imino)bis($$N,N$$-didodecylacetamide)), which show analogous structures with MIDOA, have similar extraction behavior to that of MIDOA.

Journal Articles

Solvent effect in supercritical carbon dioxide extraction of metal ions

Meguro, Yoshihiro; Ogiyanagi, Jin*; Tomioka, Osamu; Imura, Hisanori*; Ohashi, Kozaburo*; Yoshida, Zenko; Nakashima, Mikio

Proceedings of 2nd International Symposium on Supercritical Fluid Technology for Energy and Environment Applications (Super Green 2003), p.175 - 179, 2004/00

One of the most attractive properties of SFE is that changing solvent properties by tuning pressure can control distribution behavior of a metal ion. Distribution ratio (D) of uranium(VI) and plutonium(IV) with tributyl phosphate (TBP) from a nitric acid solution and palladium(II) with 2-methyl-8-qunolinol (HMQ) from a hydrochloric solution were determined in SFE at various pressures. In the extraction system using TBP, a linear relationship between the logarithmic distribution ratio (log D) and the solubility parameter of CO$$_{2}$$ was observed. The solubility parameter is difined based on the regular solution theory and is one of the parameters depending on the pressure. On the other hand, a linear relationship with a positive slope between log D and the solubility parameter was observed in the extraction system using HMQ. Most of the extractant was dissolved in the aqueous phase as H$$_{2}$$MQ$$^{+}$$ under the extraction condition examined.

Journal Articles

Pressure dependence of supercritical carbon dioxide extraction equilibrium of palladium(II) with 2-Methyl-8-quinolinol

Ogiyanagi, Jin; Meguro, Yoshihiro; Yoshida, Zenko; Ohashi, Kozaburo*

Analytical Sciences (CD-ROM), 17(Suppl.), p.717 - 720, 2002/03

no abstracts in English

Oral presentation

New extractant, (Methylimino)bis(dioctylacetamide) (MIDOA) and its extraction property

Sasaki, Yuji; Kitatsuji, Yoshihiro; Kimura, Takaumi; Ohashi, Kozaburo*

no journal, , 

no abstracts in English

Oral presentation

Application of tridentate diamides containing soft donor atoms to the extraction of Tc(VII)

Sasaki, Yuji; Kimura, Takaumi; Ohashi, Kozaburo*

no journal, , 

no abstracts in English

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