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Dynamic analysis of changes in diffusion and sorption parameters in the reaction of SO 2 with activated soda ash
Author(s) -
Doǧu Gülsen,
Keskin Alne,
Doǧu Timur
Publication year - 1988
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.5450660411
Subject(s) - adsorption , diffusion , sorption , chemistry , solubility equilibrium , activated carbon , analytical chemistry (journal) , chemical engineering , materials science , thermodynamics , chromatography , solubility , engineering , physics
Abstract Variations in pore structure cause significant changes in diffusion resistance and adsorption characteristics during the reaction of SO 2 with activated soda. Breakthrough and moment analysis of the SO 2 ‐activated soda ash reaction showed that the effective diffusion coefficient of SO 2 in the solid product (mostly Na 2 SO 3 ) was about three times smaller than its value in the original activated soda. About 30% of the diffusion flux of SO 2 in the solid product was found to be due to surface diffusion. The adsorption equilibrium constant of SO 2 on the solid product was found to be about half the value of the adsorption equilibrium constant on activated soda. It was also determined that SO 2 was irreversibly adsorbed on the solid product Na 2 SO 3 at 200°C and 3.7 atm. The gaseous product CO 2 was not adsorbed on the solid product while it was slightly adsorbed on activated soda.