Effect of s/g ratio on kraft pulping and ecf bleaching of some poplars and eucalyptus

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dc.contributor.authorVentorim, Gustavo [UNESP]
dc.contributor.authorAlves, Ericka F.
dc.contributor.authorPenna, Lais S.
dc.contributor.authorFrancis, Raymond C.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSUNY Coll Environm Sci & Forestry SUNY ESF
dc.contributor.institutionUniversidade Federal de Viçosa (UFV)
dc.contributor.institutionSci Consultant
dc.date.accessioned2014-12-03T13:08:41Z
dc.date.available2014-12-03T13:08:41Z
dc.date.issued2014-03-01
dc.description.abstractThe effect of syringyl:guaiacyl (S/G) ratio on kraft pulping and kraft pulping followed by O-2 delignification was investigated with six poplars grown on the same site. The results showed an improvement in the ease of delignification (EOD) when the S/G ratio was increased from a low to a moderately high value. However, above that moderately high value there was no further improvement in EOD with increasing S/G ratio. Kraft pulping followed by elemental chlorine-free (ECF) bleaching was then investigated with three Brazilian eucalypti with S/G ratio of 2.69, 2.46 and 2.41. The chips with S/G = 2.69 had superior EOD compared to the chips with S/G = 2.41. However, pulps from the S/G = 2.69 chips also contained less lignin-carbohydrate complexes (LCC) than corresponding pulps from the chips with S/G = 2.41. LCC are known to retard delignification in both alkaline pulping and ECF bleaching. The S/G ratio of eucalyptus pulp lignins was estimated by nitrobenzene oxidation (NBO) of the pulps and H-1 NMR or their isolated lignins. The S/G ratio decreased from a value of >= 2.46 for the lignin in two eucalyptus chip samples to <= 1.21 for the lignin in their kraft pulps. In general, S units appear to solubilize at a much higher rate than G units during kraft pulping.en
dc.description.affiliationUniv Estadual Paulista, UNESP, Sao Paulo, Brazil
dc.description.affiliationSUNY Coll Environm Sci & Forestry SUNY ESF, Dept Paper & Bioproc Engn PBE, Syracuse, NY 13210 USA
dc.description.affiliationUniv Fed Vicosa, Dept Chem Engn, BR-36570000 Vicosa, MG, Brazil
dc.description.affiliationSci Consultant, Syracuse, NY 13210 USA
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Sao Paulo, Brazil
dc.description.sponsorshipNSF
dc.description.sponsorshipAndritz Inc.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdNSFCHE 1105726
dc.format.extent365-373
dc.identifierhttp://www.cellulosechemtechnol.ro/pdf/CCT3-4%282014%29/p.365-373.pdf
dc.identifier.citationCellulose Chemistry and Technology. Bucuresti: Editura Acad Romane, v. 48, n. 3-4, p. 365-373, 2014.
dc.identifier.issn0576-9787
dc.identifier.lattes3238357061477589
dc.identifier.urihttp://hdl.handle.net/11449/111469
dc.identifier.wosWOS:000339139600020
dc.language.isoeng
dc.publisherEditura Acad Romane
dc.relation.ispartofCellulose Chemistry And Technology
dc.relation.ispartofjcr0.764
dc.relation.ispartofsjr0,303
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectHardwooden
dc.subjectS/G ratioen
dc.subjectlignin-carbohydrate complexesen
dc.subjectkraft pulpingen
dc.subjectECF bleachingen
dc.titleEffect of s/g ratio on kraft pulping and ecf bleaching of some poplars and eucalyptusen
dc.typeArtigo
dcterms.rightsHolderEditura Acad Romane
unesp.author.lattes3238357061477589
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciências e Engenharia, Itapevapt

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