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The effect of the presence of surfactantis on kraft pulping of Pinus Pinaster

2004Journal article Open access
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dc.contributor.authorBaptista, Cecília
dc.contributor.authorBelgacem, Mohamed Naceur
dc.contributor.authorDuarte, Ana Paula
dc.date.accessioned2010-04-28T10:07:32Z
dc.date.available2010-04-28T10:07:32Z
dc.date.issued2004
dc.description.abstractIn order to ascertain the influence of the surfactants in the delignification of Pinus pinaster wood and the bleachability of the resulting pulps, 17 surfactants from four families of surfactants were tested, namely: cationic, anionic, non-ionic and amphoteric. The best results in terms of improved delignification, lower screen rejects and lighter unbleached pulps were obtained with the non-ionic surfactants. When compared with the reference, these cookings exhibit a decrease of the pulps kappa number by up to 6.2% and 39% in the case of the screen rejects, and an increase in the unbleached pulps reflectance factor of approximately 9%. The most promising samples in terms of reflectance factor were poly(ethyleneglycol) 1000-4%, block copolymer poly(ethyleneglycol)- poly(propyleneglycol) 1100-4% and poly(oxyethylene) 100 stearyl ether-1%. It was also established that the use of surfactants as cooking additives did not influence the bleachability, but allows savings of chlorine dioxide in the first bleaching stage (about 5.2%), with the consequent environmental and economical benefits.pt
dc.identifier.urihttp://hdl.handle.net/10400.6/628
dc.languageeng
dc.subjectPinus pinasterpt
dc.subjectKraft pulppt
dc.subjectSurfactantspt
dc.subjectKappa numberpt
dc.subjectReflectance factorpt
dc.subjectScreen rejectspt
dc.subjectBleachabilitypt
dc.titleThe effect of the presence of surfactantis on kraft pulping of Pinus Pinasterpt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issueVol. 57, nº1pt
oaire.citation.titleAppita Journalpt
person.familyNamede Melo Correia Baptista
person.familyNameBelgacem
person.familyNameDuarte
person.givenNameCecília
person.givenNameMohamed Naceur
person.givenNameAna Paula
person.identifier1255684
person.identifier.ciencia-id5210-7F4F-5F4D
person.identifier.ciencia-idBC15-D376-80FE
person.identifier.orcid0000-0003-4664-6766
person.identifier.orcid0000-0002-3317-7369
person.identifier.orcid0000-0003-3333-5977
person.identifier.ridB-7123-2016
person.identifier.ridB-5904-2009
person.identifier.scopus-author-id36779562200
person.identifier.scopus-author-id7003580370
person.identifier.scopus-author-id7102602131
rcaap.rightsopenAccess
rcaap.typearticlept
relation.isAuthorOfPublication0ae278d7-b286-49f6-87bd-4a183c24e16c
relation.isAuthorOfPublication2bce69fd-cc05-44dd-bb7d-84864ba470a1
relation.isAuthorOfPublication971779ac-7c22-4f69-8bdd-4e0ec442ef2d
relation.isAuthorOfPublication.latestForDiscovery2bce69fd-cc05-44dd-bb7d-84864ba470a1

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