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Complex nature of the sulfation reaction of limestones and dolomites
Author(s) -
Chang E. Y.,
Thodos George
Publication year - 1984
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.690300314
Subject(s) - sorbent , calcination , sulfation , dolomite , mineralogy , chemistry , reaction rate , range (aeronautics) , chemical engineering , thermodynamics , materials science , adsorption , organic chemistry , catalysis , composite material , physics , engineering , biochemistry
Experimental information available in the literature for the sulfation of a wide variety of calcined limestones and dolomites has been used to establish rates of reaction over their entire range of conversion. The reaction rate was found to decay exponentially with extent of conversion and implicated parameters related to two factors, each factor representing a diffusional resistance. These factors define two generalized constants which permit the prediction of the decaying parameters associated with the sorptive capacity of the sorbent. The sorptive capacity, x ∞, which represents the ultimate conversion of the solid sorbent, has been found to depend on the pore size distribution, the chemical composition of the limestone and/or dolomite and its accessible pore surface area. The combined contribution of x ∞ along with predicted parameters permit the calculation of conversion vs. time relationships that are found in close agreement with experimental measurements for the ten sorbents investigated, with the exception of one.