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Enhancement of SO 2 sorption on lime by structure modifiers
Author(s) -
Shadman F.,
Dombek P. E.
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.5450660606
Subject(s) - lime , sorption , porosity , bauxite , limiting , thermal diffusivity , chemical engineering , inert , chemistry , mineralogy , diffusion , reaction rate , materials science , thermodynamics , organic chemistry , metallurgy , adsorption , catalysis , engineering , mechanical engineering , physics
The presence of certain inert compounds in lime can improve the rate and the final limiting conversion significantly during the lime SO 2 reaction. This physical effect is primarily due to modification of porosity. In particular, the enhancement appears to he due to increase in macro‐porosity and macro‐pore diffusivity; this in turn increases the sulfation rate and decreases pore plugging. In certain lime application processes, these compounds (structure modifiers) can be added to lime as beneficial additives to promote the reaction. Experimental data on the effect of kaolin, silica and bauxite as structure modifiers are presented. A theoretical model is developed which explains the observed effects both qualitatively and quantitatively.