Hydrogen chloride reaction with lime and limestone: kinetics and sorption capacity

The capacity of solid slaked lime and limestone for binding HCl from a gas phase has been investigated in the temperature range 60-1000-degrees-C. The binding capacity is largest in the range 500-600-degrees-C. However, for slaked lime in the presence of water, a large binding capacity is observed a...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 1992-01, Vol.31 (1), p.164-171
Main Authors: Weinell, Claus E, Jensen, Peter I, Dam-Johansen, Kim, Livbjerg, Hans
Format: Article
Language:English
Subjects:
Chemistry
Engineering
Engineering, Chemical
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
Science & Technology
Technology
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Summary:The capacity of solid slaked lime and limestone for binding HCl from a gas phase has been investigated in the temperature range 60-1000-degrees-C. The binding capacity is largest in the range 500-600-degrees-C. However, for slaked lime in the presence of water, a large binding capacity is observed also below 150-degrees-C. This is ascribed to the formation of a partially liquid product phase. At temperatures exceeding 500-degrees-C the binding capacity is limited by chemical equilibrium between gas and solid. For the range of properties studied the binding capacity is independent of particle size and only depends slightly on specific surface area. The kinetics of the binding reaction is governed by diffusion in the solid phase which is proved to follow an unreacted grain-core model. Diffusion coefficient for mass transport in the grain is reported for the temperature range 80-250-degrees-C.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie00001a023