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Effect of carry-over on the kinetics of chlorine dioxide delignification of an unbleached hardwood kraft pulp

2002Journal article Open access
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dc.contributor.authorSimões, Rogério
dc.contributor.authorBarroca, Maria J. M. C.pt
dc.contributor.authorCastro, José Almiro A. M.pt
dc.date.accessioned2010-04-28T10:06:59Z
dc.date.available2010-04-28T10:06:59Z
dc.date.issued2002
dc.description.abstractThis work is concerned with the kinetics of the prebleaching stage of a kraft pulp of Eucalyptus globulus with chlorine dioxide. Its main purpose is to discuss the influence of the degree of washing, expressed as the COD of the pulp, on the kinetics and stoichiometry of chlorine dioxide delignification. The effect of the carry-over on the rate of delignification of a Do stage was studied over time for pulps with different initial organic charges (COD). A set of experiments was specially designed to discriminate the individual role of lignin and of COD upon the initial consumption of chlorine dioxide. A modified mathematical model, taking into account the reactions of chlorine dioxide with both lignin and the carry-over, has been developed. In this model, the initial chlorine dioxide consumption (in the fast phase of reaction) is dependent on two factors: the carry-over of the pulp and the temperature of operation. However, the carry-over does not affect the corresponding initial depletion factor for the Kappa number. The role of the dissolved organic material, carried with the pulp, upon the rate of reaction in the slow period is better described in the stoichiometry. The fit of the experimental results obtained for pulps with different COD reveals good prediction capabilities for both Kappa number and chlorine dioxide concentration in a conventional D0 stage.
dc.identifier.urihttp://hdl.handle.net/10400.6/573
dc.languageeng
dc.subjectKraft pulppt
dc.subjectBleachingpt
dc.subjectKineticspt
dc.subjectMathematical modelpt
dc.subjectCarry-overpt
dc.subjectHardwood pulppt
dc.subjectEucalyptus globuluspt
dc.titleEffect of carry-over on the kinetics of chlorine dioxide delignification of an unbleached hardwood kraft pulppt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue55(1)pt
oaire.citation.titleAppita Journalpt
person.familyNameSimões
person.givenNameRogério Manuel Santos
person.identifier.ciencia-idC61A-FEC7-573C
person.identifier.orcid0000-0001-8143-1555
rcaap.rightsopenAccess
rcaap.typearticlept
relation.isAuthorOfPublication09cfc862-f9eb-4943-862c-790e0224d370
relation.isAuthorOfPublication.latestForDiscovery09cfc862-f9eb-4943-862c-790e0224d370

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