Modeling Cesium Ion Exchange on Fixed-Bed Columns of Crystalline Silicotitanate Granules

A mathematical model is presented to simulate Cs exchange in fixed-bed columns of a novel crystalline silicotitanate (CST) material, UOP IONSIV IE-911. A local equilibrium is assumed between the macropores and the solid crystals for the particle material balance. Axial dispersed flow and film mass-t...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2000-05, Vol.39 (5), p.1356-1363
Main Authors: Latheef, I. M, Huckman, M. E, Anthony, R. G
Format: Article
Language:English
Subjects:
ADSORPTION ISOTHERMS
Applied sciences
CESIUM
Chemistry
DIFFUSION
Exact sciences and technology
General and physical chemistry
ION EXCHANGE
MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
MATHEMATICAL MODELS
Other ion exchangers: preparations and properties
Pollution
RADIOACTIVE WASTE PROCESSING
Radioactive wastes
SILICON COMPOUNDS
Surface physical chemistry
TITANATES
Wastes
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Summary:A mathematical model is presented to simulate Cs exchange in fixed-bed columns of a novel crystalline silicotitanate (CST) material, UOP IONSIV IE-911. A local equilibrium is assumed between the macropores and the solid crystals for the particle material balance. Axial dispersed flow and film mass-transfer resistance are incorporated into the column model. Cs equilibrium isotherms and diffusion coefficients were measured experimentally, and dispersion and film mass-transfer coefficients were estimated from correlations. Cs exchange column experiments were conducted in 5−5.7 M Na solutions and simulated using the proposed model. Best-fit diffusion coefficients from column simulations were compared with previously reported batch values of Gu et al. and Huckman. Cs diffusion coefficients for the column were between 2.5 and 5.0 × 10-11 m2/s for 5−5.7 M Na solutions. The effect of the isotherm shape on the Cs diffusion coefficient was investigated. The proposed model provides good fits to experimental data and may be utilized in designing commercial-scale units.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie990748u