Nitric Acid and Water Extraction by T2EHDGA in<i>n</i>-Dodecane

Campbell, Emily L.; Holfeltz, Vanessa E.; Hall, Gabriel B.; Nash, Kenneth L.; Lumetta, Gregg J.; Levitskaia, Tatiana G.

doi:10.1080/07366299.2017.1400161

Cited by 41 publications

(65 citation statements)

References 39 publications

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“…Thi i c ea e, h e e , ge e ced f i i ia i ic acid c ce a i g ea e ha 2 /L, i dica i g he begi i g f he a a i f he ga ic ha e. The e ac i f i ic acid b TODGA a d i i a DGA e ac i g age i e ed ceed a g he f a i f he (TODGA) (HNO3) add c a a d i e edia e i ic acid c ce a i a d (TODGA) (HNO3)2 a e e a ed i ic acid c ce a i . 38 The e e ce f he a e add c i e ide f a e i ic acid c ce a i g ea e ha 3 /L, he e he i ic acid c ce a i i he ga ic ha e e ceed he TODGA c ce a i , ee Fig e 3.…”

Section: Ni Ic Acid E Ac Ion I H Todga In Dipbmentioning

confidence: 97%

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Solvent extraction of An(III) and Ln(III) using TODGA in aromatic diluents to suppress third phase formation

et al. 2020

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The extraction of nitric acid, trivalent actinides and lanthanides with N,N,N ,N -tetra-n-octyl-3-oxapentanediamide (TODGA) dissolved in the aromatic diluents 1,4-diisopropylbenezene and tert-butylbenzene was studied. Nitric acid extraction proceeds along the formation of 1:1 and 2:1 HNO3-TODGA adducts. An(III) and Ln(III) distribution ratios were determined as a function of nitric acid, TODGA and Ln(III) concentrations. Distribution ratios are approximately an order of ag i de lower in aromatic diluents compared to aliphatic diluents.No third phase formation was observed when contacting the solvent with an aqueous phase containing 1.5 mol/L Er(NO3)3 in 2 4.3 mol/L HNO3. Slope analysis indicates the formation of 1:3 and 1:4 M(III):TODGA complexes. Using TRLFS, the formation of a previously unknown 1:2 complex in organic phases loaded with Ln(III) was observed for the first time.

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Section: Ni Ic Acid E Ac Ion I H Todga In Dipbmentioning

confidence: 97%

“…U i g a e 1-c a di e e i ig ifica c -e ac i f i ic acid b he di e , 35 i addi i he i ic acid e ac ed b he DGA. 6,[36][37][38] Addi g a difie a c ica e e c ea -d e he i c ea ed be f c i e each f i g a i deg ada i d c d e h d i a d adi i .…”

Section: Introductionunclassified

Solvent extraction of An(III) and Ln(III) using TODGA in aromatic diluents to suppress third phase formation

et al. 2020

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“…Similar to other neutral extracting agents, [59][60][61][62][63][64][65][66][67] DMDOHEMA in TPH extracts significant amounts of nitric acid. Figure 2 shows the amount of nitric acid extracted as a function of initial aqueous nitric acid concentration (initial concentration is reported to represent nitric acid extraction for given experimental conditions, i. e. initial nitric acid and DMDOHEMA concentrations).…”

Section: Nitric Acid Extractionmentioning

confidence: 99%

Extraction of Nitric Acid, Americium(III), Curium(III), and Lanthanides(III) into DMDOHEMA Dissolved in Kerosene

Geist

Berthon

Charbonnel

et al. 2020

Solvent Extraction and Ion Exchange

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Liquid-liquid distribution data were determined for the extraction of nitric acid, Am(III), Cm(III) and lanthanides(III) from 0.1-7 mol/L nitric acid into 0.5-1 mol/L N, N'-dimethyl-N,N'-dioctyl-2-[2-(hexyloxy)ethyl]-malonamide (DMDOHEMA) dissolved in kerosene. Nitric acid extraction was accurately modelled accounting for the adducts, (HNO3)L2, (HNO3)L and (HNO3)2L. To model Am(III) extraction the following complexes were taken into account, Am(NO3)3L4, Am(NO3)3(HNO3)L3 and a third complex: Am(NO3)3(HNO3)2L3 (considering spectroscopic results) or Am(NO3)3(HNO3)2L2 (considering slope analysis results). Separation factors for Am(III) over Cm(III) and the lighter lanthanides(III) are practically independent of nitric acid concentration. Am(III)/Ln(III) separation factors decrease with increasing nitric acid concentration for the heavier lanthanides(III).

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“…Nitric acid extraction from 0.1-3 mol/L nitric acid into 0.01-0.2 mol/L T2EHDGA (N,N,N',N'-tetra (2-ethylhexyl) diglycolamide) dissolved in n-dodecane was modelled accounting for the formation of HNO3•T2EHDGA and 2HNO3•T2EHDGA adducts [ 34 ]. Due to the absence of the modifier this model is not applicable to the TODGA + 5 v/v% octanol solvent.…”

Section: Figure 1: Nnn'n'-tetra-n-octyl Diglycolamide (Todga)mentioning

confidence: 99%

Nitric Acid Extraction into a TODGA Solvent Modified with 1-Octanol

Woodhead

McLachlan

Taylor

et al. 2019

Solvent Extraction and Ion Exchange

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Distribution data for the partition of nitric acid between nitric acid solution and a solvent phase comprising various combinations of TODGA, octanol and inert kerosene diluent have been generated, covering a range of conditions from 0-9 mol/L HNO3(aq), 0-100% octanol, 0-0.4 mol/L TODGA over a temperature range from 10-50 °C. The data have been used to derive a model describing the nitric acid equilibrium between the phases suitable for incorporation in process models of e.g. the innovative SANEX process. For the nitric acid / octanol / diluent system it was found that an accurate prediction of nitric acid distribution could be achieved using a model allowing 1:1, 1:2 and 1:3 nitric acid / octanol adducts. For the nitric acid / TODGA / diluent system the best models were found to be those allowing 4:1, 3:1, 2:1, 1:1 and 2:2 nitric acid / TODGA adducts. Superimposing the models for nitric acid distribution into the individual extractants and comparing with experimental results for the nitric acid / octanol / TODGA system showed systematic differences indicative of antagonistic and synergistic effects applying in the ranges 0.5-1.5 mol/L HNO3 and > 1.5 mol/L HNO3 respectively. These effects were modelled by the inclusion of 0:1:2, 1:1:1, 2:1:3 and 3:1:2 nitric acid / TODGA / octanol adducts. The effect of temperature on nitric acid extraction was well described by an Arrhenius type expression with an activation energy of −25.7 kJ/mol. No diluent dependence was found for nitric acid extraction.

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Nitric Acid and Water Extraction by T2EHDGA inn-Dodecane

Cited by 41 publications

References 39 publications

Solvent extraction of An(III) and Ln(III) using TODGA in aromatic diluents to suppress third phase formation

Solvent extraction of An(III) and Ln(III) using TODGA in aromatic diluents to suppress third phase formation

Extraction of Nitric Acid, Americium(III), Curium(III), and Lanthanides(III) into DMDOHEMA Dissolved in Kerosene

Nitric Acid Extraction into a TODGA Solvent Modified with 1-Octanol

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