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Thermodynamics and kinetics of the kraft causticizing reaction
Author(s) -
Wang L.,
Tessier P. J.C.,
Englezos P.
Publication year - 1994
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.5450720219
Subject(s) - endothermic process , thermodynamics , sodium sulfide , chemistry , sodium carbonate , kraft paper , kraft process , lime , kinetic energy , sodium , materials science , organic chemistry , physics , adsorption , metallurgy , composite material , quantum mechanics
A methodology for the calculation of the equilibrium of the causticizing reaction of pure sodium carbonate solutions at 100°C without any adjustable parameters is presented. The methodology is extended to compute the effect of sodium sulfide. The causticizing reaction was found to be slightly endothermic at 100°C. The caculated results were found to be in good agreement with experimental data. An empirical kinetic model for the causticizing reaction is also presented. The model takes into account the variations in both green liquor composition and lime quality and can yield the causticizing efficiency directly. The calculated results of the causticizing efficiency were found to be in good agreement with experimental data from several Canadian pulp mills and reflected the effect of the variation in lime quality.