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Title: Modeling cesium ion exchange on fixed-bed columns of crystalline silicotitanate granules

Abstract

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 x 10{sup {minus}11} m{sup 2}/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.

Authors:
; ;
Publication Date:
Research Org.:
Texas A and M Univ., College Station, TX (US)
Sponsoring Org.:
Texas A and M University; USDOE
OSTI Identifier:
20076077
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 39; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; MATHEMATICAL MODELS; CESIUM; ION EXCHANGE; SILICON COMPOUNDS; TITANATES; ADSORPTION ISOTHERMS; DIFFUSION; RADIOACTIVE WASTE PROCESSING

Citation Formats

Latheef, I.M., Huckman, M.E., and Anthony, R.G. Modeling cesium ion exchange on fixed-bed columns of crystalline silicotitanate granules. United States: N. p., 2000. Web. doi:10.1021/ie990748u.
Latheef, I.M., Huckman, M.E., & Anthony, R.G. Modeling cesium ion exchange on fixed-bed columns of crystalline silicotitanate granules. United States. doi:10.1021/ie990748u.
Latheef, I.M., Huckman, M.E., and Anthony, R.G. Mon . "Modeling cesium ion exchange on fixed-bed columns of crystalline silicotitanate granules". United States. doi:10.1021/ie990748u.
@article{osti_20076077,
title = {Modeling cesium ion exchange on fixed-bed columns of crystalline silicotitanate granules},
author = {Latheef, I.M. and Huckman, M.E. and Anthony, R.G.},
abstractNote = {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 x 10{sup {minus}11} m{sup 2}/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.},
doi = {10.1021/ie990748u},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 5,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}