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Kinetics of hydration‐dehydration reactions considered as solid transformations
Author(s) -
Stanish M. A.,
Perlmutter D. D.
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.690300405
Subject(s) - dehydration , chemistry , thermodynamics , nucleation , kinetics , rate equation , formate , organic chemistry , catalysis , biochemistry , physics , quantum mechanics
Abstract A mechanism is proposed for the dehydration‐rehydration process in solid inorganic salts, and model rate equations are derived and applied to the observed behavior of potassium carbonate. Quantitative expressions for the effect of pressure on the reaction rates are derived using basic principles from nucleation and heterogeneous phase transformation theory. Model equation predictions agree with experimental dehydration and rehydration rate data at all but extreme pressures. The basic rate equation is also used to interpret the data of Eckhardt and Flanagan (1964) for the effect of pressure on the dehydration of manganous formate dihydrate. The mechanism on which the model equations are based is also consistent with the observed effects of cycling and of high temperature pretreatment on the K 2 CO 3 rehydration rate.