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The kinetics of absorption of so3 in calcium and magnesium oxides
Author(s) -
Thibault J. Dean,
Steward Frank R.,
Ruthven Douglas M.
Publication year - 1982
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450600611
Subject(s) - diffusion , absorption (acoustics) , kinetics , magnesium , porosity , grain size , particle size , materials science , activation energy , swelling , flue gas , chemistry , calcium , flue gas desulfurization , mineralogy , analytical chemistry (journal) , metallurgy , thermodynamics , composite material , chromatography , organic chemistry , physics , quantum mechanics
Results of an experimental study of the absorption of SO 3 by CaO and MgO particles are reported. Uptake rates are shown to be controlled by intragranular diffusion and are essentially independent of gross particle size in the range 0.06‐0.33 mm. The data can be correlated by the swelling grain model of Georgakis et al. (12) . The uptake rate in MgO is considerably faster than in CaO but this difference is shown to be attributable mainly to differences in grain size and porosity. Activation energies for diffusion of SO 3 through the product layer are about 40 kJ/mol for both absorbents and diffusivities at 800 K are about 10 −8 . cm 2 . S −1 . The results are discussed in relation to the development of an efficient dry scrubbing flue gas desulphurization process.