Modelling of Nitric Acid and Water Extraction Fromaqueous Solutions Containing a Salting-Out Agent by Tri-N-Butylphosphate

Mokili, B.; Poitrenaud, C.

doi:10.1080/07366299508918300

Cited by 46 publications

(25 citation statements)

References 4 publications

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“…A constant neptunium (V) distribution ratio and constant water concentration in the organic phase were also assumed, based on previous reports. [34,39] These assumptions are likely to lead to some errors in the calculated organic and aqueous phase concentrations of key species. Secondly, the mass transfer coefficients have been fitted to minimize the mean square error compared to experimental data.…”

Section: Discussionmentioning

confidence: 99%

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Development and Validation of a Flowsheet Simulation Model for Neptunium Extraction in an Advanced PUREX Process

Chen

Taylor

Jobson

et al. 2016

Solvent Extraction and Ion Exchange

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An Advanced PUREX process has been developed for separation and recycling of neptunium from spent nuclear fuel. This work presents a new flowsheet simulation model for the extraction of neptunium using centrifugal contactors, where mass transfer is modeled using two-film theory and a linear driving force. Distribution coefficients and neptunium redox reactions are modeled using published models. Mass transfer between the organic and aqueous phases in the phase separation zone is shown to have a negligible effect. The model is applied to a previously tested flowsheet and its predictions are shown to be in good agreement with the experimental results.

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Section: Discussionmentioning

confidence: 99%

“…In this model, specifically, C H 2 O;or = 0.42 mol/L. [34] This assumption simplifies the calculations.…”

Section: Modeling Of Neptunium Redox Reaction Kineticsmentioning

confidence: 99%

Development and Validation of a Flowsheet Simulation Model for Neptunium Extraction in an Advanced PUREX Process

Chen

Taylor

Jobson

et al. 2016

Solvent Extraction and Ion Exchange

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“…The species of TBP existing in the organic phase were studied in several works [1][2][3][4][5][6][7][8]. The obtained results were used to elaborate models which allow the prediction of the extraction isotherms.…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid equilibria in the system H3PO4–KCl–H2O–tri-n-butyl phosphate: experiments and modelling

Ziat

Messnaoui

Bounahmidi

et al. 2004

Fluid Phase Equilibria

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“…Camacho Frias [20] used the same model to describe palladium speciation in concentrated nitric acid. Mokili [21][22][23] applied this model to the liquid-liquid extraction of water, nitric acid, and lanthanide ions with n-tributylphosphate. Charrin [24] used this model to calculate the densities of ternary and quaternary actinide solutions in nitric acid media.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, unlike the concept of ionic strength, the water activity is not the result of a calculation but is an experimentally measurable physicochemical quantity that takes into account the full or partial dissociation of electrolyte salts. The simple solution model has led to several applications in the literature for the particular case of concentrated electrolyte solutions [19][20][21][22][23][24][25][26]. Ly [19] applied this theory to the determination of the complexation constants of the Cd(II)-nitrato system for concentrated salt solutions.…”

Section: Introductionmentioning

confidence: 99%

Acid–Base Properties of the $\mathrm{Fe}(\mathrm{CN})_{6}^{3-}$ / $\mathrm{Fe}(\mathrm{CN})_{6}^{4-}$ Redox Couple in the Presence of Various Background Mineral Acids and Salts

et al. 2012

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The acid-base behavior of Fe(CN) 4− 6 was investigated by measuring the formal potentials of the Fe(CN) 3− 6 /Fe(CN) 4− 6 couple over a wide range of acidic and neutral solution compositions. The experimental data were fitted to a model taking into account the protonated forms of Fe(CN) 4− 6 and using values of the activities of species in solution, calculated with a simple solution model and a series of binary data available in the literature. The fitting needed to take account of the protonated species HFe(CN) 3− 6 and H 2 Fe(CN) 2− 6 , already described in the literature, but also the species H 3 Fe(CN) − 6 (associated with the acid-base equilibrium H 3 Fe(CN) − 6 H 2 Fe(CN) 2− 6 + H + ). The acidic dissociation constants of HFe(CN) 3− 6 , H 2 Fe(CN) 2− 6 and H 3 Fe(CN) − 6 were found to be pK II 1 = 3.9 ± 0.1, pK II 2 = 2.0 ± 0.1, and pK II 3 = 0.0 ± 0.1, respectively. These constants were determined by taking into account that the activities of the species are independent of the ionic strength.

show abstract

Modelling of Nitric Acid and Water Extraction Fromaqueous Solutions Containing a Salting-Out Agent by Tri-N-Butylphosphate

Cited by 46 publications

References 4 publications

Development and Validation of a Flowsheet Simulation Model for Neptunium Extraction in an Advanced PUREX Process

Development and Validation of a Flowsheet Simulation Model for Neptunium Extraction in an Advanced PUREX Process

Liquid–liquid equilibria in the system H3PO4–KCl–H2O–tri-n-butyl phosphate: experiments and modelling

Acid–Base Properties of the $\mathrm{Fe}(\mathrm{CN})_{6}^{3-}$ / $\mathrm{Fe}(\mathrm{CN})_{6}^{4-}$ Redox Couple in the Presence of Various Background Mineral Acids and Salts

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