Rigorous modeling of the kinetics of calcium carbonate deposit formation

Raviv Segev; David Hasson; Raphael Semiat

doi:10.1002/aic.12645

Rigorous modeling of the kinetics of calcium carbonate deposit formation

Raviv Segev, David Hasson^*, Raphael Semiat

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The complexity of CaCO ₃ 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 CaCO ₃ wall deposition under turbulent flow as well as the kinetics of the CaCO ₃ 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.

Original language	English
Pages (from-to)	1222-1229
Number of pages	8
Journal	AICHE Journal
Volume	58
Issue number	4
DOIs	https://doi.org/10.1002/aic.12645
State	Published - Apr 2012
Externally published	Yes

Keywords

CaCO precipitation kinetics
Multicomponent ionic diffusion
Rigorous analysis
Scale deposition
Simplified models

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10.1002/aic.12645

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abstract = "The complexity of CaCO 3 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 CaCO 3 wall deposition under turbulent flow as well as the kinetics of the CaCO 3 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.",

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AU - Hasson, David

AU - Semiat, Raphael

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AB - The complexity of CaCO 3 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 CaCO 3 wall deposition under turbulent flow as well as the kinetics of the CaCO 3 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.

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KW - Scale deposition

KW - Simplified models

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Rigorous modeling of the kinetics of calcium carbonate deposit formation

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Keywords

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