An Additional Insight into the Correlation between the Distribution Ratios and the Aqueous Acidity of the TODGA System

Sasaki, Yoshiyuki; Rapold, Philippe; Arisaka, Makoto; Hirata, Masaru; Kimura, Takaumi; Hill, C.; Cote, Gérard

doi:10.1080/07366290601169345

Cited by 141 publications

(89 citation statements)

References 27 publications

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“…This increase in the transport rate was attributed to the increasing tendency of the formation of the nitrate complexes with increase of feed acidity while the decrease is ascribed to the formation of TODGA Á HNO 3 adduct formation (resulting in the decrease of the free ligand, TODGA). The interaction of TODGA with HNO 3 has been reported by Sasaki et al, in an earlier publication (23). We have earlier observed that some amount of acid was transported from the feed compartment to the receiver compartment, and the effect was pronounced especially at 6 M HNO 3 (15).…”

Section: Effect Of Feed Nitric Acid Concentrationmentioning

confidence: 68%

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Panja

Mohapatra

Tripathi

et al. 2010

Separation Science and Technology

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The transport behavior of Th 4þ was investigated from a feed containing 3.0 M HNO 3 into a receiver phase containing 0.1 M oxalic acid across a PTFE flat sheet supported liquid membrane (SLM) which contained TODGA (N,N,N 0 ,N 0 -Tetraoctyl-3-oxapentanediamide) in n-dodecane as the extractant. Effects of the nature of the strippant, extractant concentration, Th concentration in the feed, and feed acidity on the transport rates were investigated. The transport behavior apparently depended on the rate of extraction of the metal ion at the feed-membrane interface and was not diffusion controlled. Influence of Th concentration on flux was also investigated. Transport mechanism was elucidated and the diffusion coefficient was calculated to be 2.13 Â 10 À7 cm 2 / s. Solvent extraction studies at varying feed acidity and TODGA concentration were also carried out.

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Section: Effect Of Feed Nitric Acid Concentrationmentioning

confidence: 68%

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Panja

Mohapatra

Tripathi

et al. 2010

Separation Science and Technology

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“…N,N,N´,N´-Tetraoctyl diglycolamide (TODGA) has been extensively studied by various groups for the co-extraction of lanthanides and actinides. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] It is reported that TODGA also extracts some of the fission products from highly acidic HLW. [15,16] It is also reported that the branching of the alkyl chain attached to the acyl N atoms of the diglycolamides suppresses the co-extraction of fission products.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Use ofN,N,N´,N´-Tetra(2-ethylhexyl) Diglycolamide (TEHDGA) for Actinide Partitioning. I: Investigation on Third-Phase Formation and Extraction Behavior

Deepika

Sabharwal

Srinivasan

et al. 2010

Solvent Extraction and Ion Exchange

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Diglycolamides have emerged as an interesting class of extractants for actinide partitioning from high-level waste (HLW). N,N,N´,N´-tetraoctyl diglycolamide (TODGA) has been extensively studied for lanthanide-actinide co-extraction behavior. The present work deals with a branched isomer of TODGA, that is, N,N,N´, N´-tetra(2-ethylhexyl) diglycolamide (TEHDGA). TEHDGA was studied for the extraction of 241 Am and third-phase formation. The effect of using different phase modifiers on the prevention of the formation of a third phase during nitric acid extraction by TEHDGA along with the acid uptake behavior by TEHDGA in the presence of the modifiers was studied. The modifiers used for this purpose were di (n-hexyl)octanamide (DHOA), isodecanol, and n-decanol. The effect of the modifiers on the uptake of 241 Am as a function of acid concentration and as a function of modifier concentration was also examined. DHOA was found to be a suitable modifier, in spite of its high acid uptake. The uptake of lanthanides Ce, La, Eu, Gd, and Nd and elements such as Fe, Ni, Mn, Mo, Ru, Sr, and Cs with DHOA-modified TEHDGA-n-dodecane solvent systems were investigated. The results obtained indicated that, while DHOA-modified TEHDGA/n-dodecane extracted lanthanides and actinides, it did not show any significant uptake of other elements. Thus, the TEHDGA-DHOA/n-dodecane solvent system can be used effectively for the partitioning of lanthanides and actinides from HLW.

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“…This organic diluent is used in the PUREX process, and it was already known that n-dodecane gives the satisfactory D values for An [14]. Although it is not used in the PUREX process, perchloric acid was used as the aqueous phase in order to provide the effective conditions for ion-pair extraction and to obtain detectable and comparable D values.…”

Section: Extraction Of An(iii) (Iv) (V) and (Vi) By The Extractantsmentioning

confidence: 99%

Actinides Extractability Trends for Multidentate Diamides and Phosphine Oxides

Sasaki¹,

Kitatsuji²,

Sugo³

et al. 2012

SERDJ

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Diamides and phosphine oxides having many types of central frames were synthesized and employed in order to determine the behavior of the actinides (An)(III), (IV), (V) and ( Measurement of the D value at different extractant concentrations gave information on the extraction reaction and extraction ability. From the present work, the best extractant is BDPPM, due to the strong affinity provided P=O group and its bidentate form resulting in six-membered ring chelation. However, this extractant has too low a solubility in n-dodecane. From the properties required for application, e.g., high solubility in n-dodecane, easy organic synthesis, gasification by combustion and high actinide extractability, into consideration, diglycolamide (DGA) is a promising extractant for radioactive waste treatment.

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An Additional Insight into the Correlation between the Distribution Ratios and the Aqueous Acidity of the TODGA System

Cited by 141 publications

References 27 publications

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Transport of Thorium(IV) Across a Supported Liquid Membrane Containing N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA) as the Extractant

Studies on the Use ofN,N,N´,N´-Tetra(2-ethylhexyl) Diglycolamide (TEHDGA) for Actinide Partitioning. I: Investigation on Third-Phase Formation and Extraction Behavior

Actinides Extractability Trends for Multidentate Diamides and Phosphine Oxides

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