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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/111469
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dc.contributor.authorVentorim, Gustavo-
dc.contributor.authorAlves, Ericka F.-
dc.contributor.authorPenna, Lais S.-
dc.contributor.authorFrancis, Raymond C.-
dc.date.accessioned2014-12-03T13:08:41Z-
dc.date.accessioned2016-10-25T20:08:38Z-
dc.date.available2014-12-03T13:08:41Z-
dc.date.available2016-10-25T20:08:38Z-
dc.date.issued2014-03-01-
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.urihttp://hdl.handle.net/11449/111469-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/111469-
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.sponsorshipNSF-
dc.description.sponsorshipAndritz Inc.-
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
dc.format.extent365-373-
dc.language.isoeng-
dc.publisherEditura Acad Romane-
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.typeoutro-
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.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.sponsorshipIdNSFCHE 1105726-
dc.identifier.wosWOS:000339139600020-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofCellulose Chemistry And Technology-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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