Removal of actinides from ICPP fuel reprocessing wastes engineering studies terminal report

Maxey, H.R.; Chamberlain, David B.; McManus, G.J.; Colton, Erica; Nebeker, R.L.

doi:10.2172/7089531

Cited by 3 publications

(2 citation statements)

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“…1<i<m (17) In addition, since all of the aqueous phase is taken as effluent at stage 1 and all of the organic phase is taken as effluent at stage m, fe.a.1 = 1 H8) and fe,o.m-1…”

Section: Component Concentration Equationsmentioning

confidence: 99%

“…The range for the new backmix model is obtained by holding the backmix ratio at 0.35 (35%) and observing the range of stage heights, H s , for this ratio. The ranges for HETS and HTU were obtained from Maxey et al (17) for the same four runs. As can be seen from the table, the range of heights is smallest for the new backmix model.…”

Section: Column-specific Modelmentioning

confidence: 99%

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A New Model for Solvent Extraction in Columns

Leonard

Regalbuto

Chamberlain

et al. 1990

Separation Science and Technology

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A new model was developed for analyzing solvent extraction processes carried out in columns. Each column is treated as a series of well-defined equilibrium stages where the backmixing (other-phase carryover) between stages can be large. By including all mass transfer effects in the backmixing value, the same number of stages can be used for all extracted components no matter what their distribution coefficients. This greatly simplifies the calculations required when modeling multicomponent solvent extraction processes. Initial testing shows the new model to be better than either the Height of an Equivalent Theoretical Plate (HETP) or the Height of a Transfer Unit (HTU) method.

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“…1<i<m (17) In addition, since all of the aqueous phase is taken as effluent at stage 1 and all of the organic phase is taken as effluent at stage m, fe.a.1 = 1 H8) and fe,o.m-1…”

Section: Component Concentration Equationsmentioning

confidence: 99%

Section: Column-specific Modelmentioning

confidence: 99%

A New Model for Solvent Extraction in Columns

Leonard

Regalbuto

Chamberlain

et al. 1990

Separation Science and Technology

Self Cite

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Amides as Phase Modifiers for N,N′-Tetraalkylmalonamide Extraction of Actinides and Lanthanides from Nitric Acid Solutions

Smith

Wilson

Gibson

et al. 1997

Separation Science and Technology

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The N,N'-tetraalLylinaloiiaiiiides are a class of compounds under development for transuranic (TRU) separations under high nitric acid conditions. There are several issues that challenge the further development of these ligands. One is the development of improved synthetic procedures that lend themselves to conuiiercial scale-up. Another major issue is the third-phase formation that occurs when the N,N-tetraalLy1malonamides are contacted with medium-to-high nitric acid concentrations in hydrocarbon solvents. To address the synthesis issue we have developed a new synthetic approach for preparing these materials. Third-phase formation can be eliminated by addition of diluent niodifiers such as tributylphosphate (TBP). TBP is inappropriate if a nonpliospliate-coiitainiiig process stream is required. h i d e s have been proposed as alternatives for TBP in a variety of applications because of their ease of synthesis and the variety of substitueiits that can be generated. We have been able to develop an aiiiide phase-modified system that extends the working process range of alLilmalonamides (0.5 M) in dodecane (unbranched hydrocarbon) from 3.5 M to 7.5 M nitric acid and in Isopar H (branched hydrocarbon) from 4.0 M to 10.0 M nitric acid using 1.0 &j di-2-etliylhexylacetamide/0.5 M alL~Imaloiiamide. The Kd values were comparable to extraction with alLylmalonamide in Isopar H or hydrogenated tetrapropylene (TPH) solvents. The overall extraction system was more robust than the phase-unmodified system allowing for greater temperature and acid concentration fluctuations without third-phase formation.

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CMP flowsheet development for the separation of actinides from ICPP sodium-bearing waste using centrifugal contactors

Law¹,

Herbst²,

Rodríguez³

1995

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Removal of actinides from ICPP fuel reprocessing wastes engineering studies terminal report

Cited by 3 publications

References 0 publications

A New Model for Solvent Extraction in Columns

A New Model for Solvent Extraction in Columns

Amides as Phase Modifiers for N,N′-Tetraalkylmalonamide Extraction of Actinides and Lanthanides from Nitric Acid Solutions

CMP flowsheet development for the separation of actinides from ICPP sodium-bearing waste using centrifugal contactors

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