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Effect of the product layer on the kinetics of the CO 2 ‐lime reaction
Author(s) -
Bhatia S. K.,
Perlmutter D. D.
Publication year - 1983
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690290111
Subject(s) - activation energy , diffusion , lime , calcination , kinetics , thermal diffusivity , chemistry , chemical kinetics , layer (electronics) , thermodynamics , atmospheric temperature range , atmosphere (unit) , analytical chemistry (journal) , chemical engineering , mineralogy , materials science , metallurgy , catalysis , organic chemistry , physics , quantum mechanics , engineering
The kinetics of reaction between CO 2 and lime is investigated in the range of 673 to 998 K with a view to examining the effects of product layer deposition and variations in the limestone calcination atmosphere. The reaction is initially rapid and chemically controlled and goes through a sudden transition to a much slower regime controlled by diffusion in the product CaCO 3 layer. The magnitude of the estimated product layer diffusivity is in the range of 10 −18 to 10 −21 m 2 /s, the corresponding activation energy is 88.9 ± 3.7 kJ/mol below 688 K and 179.2 ± 7.0 kJ/mol above that temperature, suggestive of solid state diffusion. Plausible mechanisms are discussed.