Extraction of wood hemicelluloses through NaOH leaching

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dc.creatorJúnior, Dalton Longue
dc.creatorColodette, Jorge Luiz
dc.creatorGomes, Valéria Juste
dc.date2015-05-13
dc.date.accessioned2017-08-01T20:13:16Z
dc.date.available2017-08-01T20:13:16Z
dc.date.issued2017-08-01
dc.descriptionThe aim of this work was to assess the impact of hemicellulose extraction in eucalyptus wood, through alkaline leaching (NaOH) of wood chips, on the subsequent kraft process (with varying sulphidity) and the quality of the pulp. The chips were initially saturated with water and treated with a NaOH solution in a liquor to wood ratio of 6:1 m3/t. The reaction times (3, 8, 14 and 16 hours), temperatures (70, 84 and 90°C) and NaOH concentrations (60, 80, 90, 120 and 156g/L) were assessed in atmospheric conditions. In the pressurized treatments (300 kPa), the reaction times, temperature and NaOH concentrations assessed were, respectively: 30, 60 and 120 minutes, 100°C and 100, 150 and 200g/L. The optimal alkaline leaching condition was determined taking into account the hemicellulose concentrations remaining in the chips and the gravimetrical yield. Chips not subjected to alkaline treatment (control) and leached with NaOH in optimum conditions were kraft cooked until kappa number 17 – 18. The results indicate that alkaline leaching of chips is not efficient in extracting hemicelluloses in the wood studied. The highest extraction of 4-Omethyl- glucuronoxylan acetate reached 42% in very severe conditions (100°C, 60 minutes, 200g/L of NaOH and 300 kPa pressure). The pulp yield of the leached chips was approximately 7% lower than that of the non-leached chips (control).
dc.formatapplication/pdf
dc.identifierhttp://www.cerne.ufla.br/site/index.php/CERNE/article/view/112
dc.identifier.citationLONGUE JÚNIOR, D.; COLODETTE, J. L.; GOMES, V. J. Extraction of wood hemicelluloses through NaOH leaching. Cerne, Lavras, v. 16, n. 4, p. 423-429, out./dez. 2010.
dc.identifier.urihttps://repositorio.ufla.br/handle/1/13995
dc.publisherCERNE
dc.publisherCERNE
dc.relationhttp://www.cerne.ufla.br/site/index.php/CERNE/article/view/112/86
dc.rightsAttribution 4.0 International*
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceCERNE; Vol 16 No 4 (2010); 423–430
dc.sourceCERNE; Vol 16 No 4 (2010); 423–430
dc.source2317-6342
dc.source0104-7760
dc.subjectHemicellulose extraction
dc.subjectAlkaline leaching
dc.subjectXylans
dc.subjectLixiviação alcalina
dc.subjectRemoção de hemiceluloses
dc.subjectXilanas
dc.titleExtraction of wood hemicelluloses through NaOH leaching
dc.title.alternativeRemoção de hemiceluloses da madeira por tratamento de lixiviação alcalina com NaOH
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion

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