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Reactors, Kinetics, and Catalysis
Rigorous modeling of the kinetics of calcium carbonate deposit formation
Article first published online: 27 APR 2011
DOI: 10.1002/aic.12645
Copyright © 2011 American Institute of Chemical Engineers (AIChE)
Additional Information
How to Cite
Segev, R., Hasson, D. and Semiat, R. (2012), Rigorous modeling of the kinetics of calcium carbonate deposit formation. AIChE J., 58: 1222–1229. doi: 10.1002/aic.12645
Publication History
- Issue published online: 8 MAR 2012
- Article first published online: 27 APR 2011
- Accepted manuscript online: 4 APR 2011 10:31AM EST
- Manuscript Revised: 16 FEB 2011
- Manuscript Received: 7 DEC 2010
- Abstract
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Keywords:
- CaCO3 precipitation kinetics;
- multicomponent ionic diffusion;
- scale deposition;
- simplified models;
- rigorous analysis
Abstract
The complexity of CaCO3 deposit formation on a flow surface arises from the need to take into account the multicomponent transport of all ionic species involved in the carbonic system. Several semitheoretical and empirical models are available. This article presents a rigorous kinetic model that takes into account the diffusional transport of all species involved in CaCO3 wall deposition under turbulent flow as well as the kinetics of the CaCO3 crystallization reaction. Conditions under which high- and low-pH simplified expressions may be used are evaluated. It is shown that the simplified precipitation rate equations provide results within 10% of the rigorous solution when the high-pH expression is applied for solutions at pH levels above 9.5, and the low-pH expression is applied for solutions at pH levels below 7.6. © 2011 American Institute of Chemical Engineers AIChE J, 2012