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-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.
- Research Organization:
- Texas A and M Univ., College Station, TX (US)
- Sponsoring Organization:
- Texas A and M University; USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 20076077
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 39, Issue 5; Other Information: PBD: May 2000; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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