ICPSEF: a user's manual for the computer mathematical model of the ICPP purex solvent extraction system

Bendixsen, C.L.

doi:10.2172/6509464

Cited by 2 publications

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“…Fluid flow patterns for solvent extraction in mixer–settlers have been characterized in the literature using computational fluid dynamics . Several solvent extraction models in the literature treat the mixer and settler as two separate volumes to improve the accuracy of transient phase compositions. − Mass transfer is assumed to only take place in the mixer, and the organic and aqueous phases in the settling chamber are each modeled as independent well-mixed dilution models with no reaction . Introduction of this concept to the single-stage equilibrium model presented in eqs – is represented in Figure .…”

Section: Discussionmentioning

confidence: 99%

“…17−20 Mass transfer is assumed to only take place in the mixer, and the organic and aqueous phases in the settling chamber are each modeled as independent well-mixed dilution models with no reaction. 18 Introduction of this concept to the single-stage equilibrium model presented in eqs 9−11 is represented in Figure 10. REE and acid concentrations are modeled in the mixer using eqs 9−11, and eqs 15, 16, and 17 represent the time-dependent material balances for organic REE concentration, aqueous REE concentration, and aqueous acid concentration in the settling chamber, respectively.…”

Section: Discussionmentioning

confidence: 99%

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Dynamic Modeling for the Separation of Rare Earth Elements Using Solvent Extraction: Predicting Separation Performance Using Laboratory Equilibrium Data

Lyon

Utgikar

Greenhalgh

2017

Ind. Eng. Chem. Res.

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Industrial rare earth element (REE) separation facilities utilize acidic cation exchange ligands such as 2ethylhexylphosphonic acid mono-2-ethylhexyl ester (PC88A) for solvent extraction processes. REE separations are costly and difficult due to their chemical similarities and subsequent low separation factors. Several empirical correlations are available in the literature to predict steady state extraction equilibria for various solvent systems. However, complete solvent extraction flow sheet design for REE separations requires complex scrubbing and stripping circuits to separate and produce individual pure species. Furthermore, dynamic modeling of extraction, scrubbing, and stripping in REE separations circuits will aid in process design, optimization, and management of process fluctuations. A dynamic MATLAB/SIMULINK REE equilibrium model has been coupled with dynamic acid balances to predict REE solvent extraction processes using laboratory equilibrium data. The model was used to predict a flow sheet that produced high purity neodymium from a 25 wt % praseodymium and 75 wt % neodymium feed. Laboratory mixer−settlers were used to verify and validate model performance.Results indicated that the model reasonably predicts the dynamic behavior of a countercurrent REE separation process, and accurately predicts the steady state REE concentration profiles across the cascade. Transient concentration predictions exhibit more deviation from experimental results due to the initial assumption of a homogeneous, well-mixed stage. The model was revised to account for variations in mixer−settler holdup volumes for future validation efforts. Current model limitations assume complete equilibrium is achieved in each stage. The model can be applied to any REE separation or solvent system provided adequate laboratory equilibrium data are available.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Dynamic Modeling for the Separation of Rare Earth Elements Using Solvent Extraction: Predicting Separation Performance Using Laboratory Equilibrium Data

Lyon

Utgikar

Greenhalgh

2017

Ind. Eng. Chem. Res.

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“…Bendixsen later adapted SEPHIS-MOD4 for simulating the first-cycle uranium extraction system, conducted on sieve-plate pulse columns, at the Idaho Chemical Processing Plant (ICPP). 9 SEPHIS modules have been written for THOREX, BUTEX, and a process for co-extraction of plutonium and neptunium; in addition, preliminary blocks have been added to calculate extraction coefficients or provide coefficient data bases for UREX, TRUEX, FPEX, and TALSPEAK.…”

Section: Requirements For a Dynamic Solvent Extraction Module To Suppmentioning

confidence: 99%

Requirements for a Dynamic Solvent Extraction Module to Support Development of Advanced Technologies for the Recycle of Used Nuclear Fuel

Law¹,

Rutledge²,

Pereira³

et al. 2011

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ICPSEF: a user's manual for the computer mathematical model of the ICPP purex solvent extraction system

Cited by 2 publications

References 0 publications

Dynamic Modeling for the Separation of Rare Earth Elements Using Solvent Extraction: Predicting Separation Performance Using Laboratory Equilibrium Data

Dynamic Modeling for the Separation of Rare Earth Elements Using Solvent Extraction: Predicting Separation Performance Using Laboratory Equilibrium Data

Requirements for a Dynamic Solvent Extraction Module to Support Development of Advanced Technologies for the Recycle of Used Nuclear Fuel

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