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dc.contributor.authorLehto, Joni
dc.contributor.authorAlén, Raimo
dc.contributor.authorKleen, Marjatta
dc.date.accessioned2017-04-12T07:18:40Z
dc.date.available2017-04-12T07:18:40Z
dc.date.issued2016
dc.identifier.citationLehto, J., Alén, R., & Kleen, M. (2016). Sulfur-free pulping of hot-water-extracted spruce sawdust. <i>Nordic Pulp and Paper Research Journal</i>, <i>31</i>(1), 41-48. <a href="https://doi.org/10.3183/npprj-2016-31-01-p041-048" target="_blank">https://doi.org/10.3183/npprj-2016-31-01-p041-048</a>
dc.identifier.otherCONVID_25492456
dc.identifier.otherTUTKAID_68878
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/53580
dc.description.abstractSoftwood (Picea abies) sawdust was hot-water-extracted with two multi-phase processes (160-180°C, 100-280 min, and liquor-to-wood ratio 5 l/kg) corresponding to P-factors of ~780 (yield 80.0%) and ~4580 (yield 72.4%). The pre-treated materials were then pulped with the soda-AQ cooking (170°C, NaOH charge 20%, AQ charge 0.1%, 30-150 min, and liquor-to-wood ratio 5 l/kg), resulting in a yield range of 36.1-61.4% (for reference cooks without pre-extraction 47.9-60.0%). It was observed that the pre-extraction under moderate conditions enhanced the dissolution especially of large-molar-mass lignin during cooking, and the total amount of the dissolved lignin was also higher than that removed from the material pre-extracted under harsh conditions. Additionally, in the former case the pulps with rather good properties (high yield and low amount of pulp rejects) were obtained, whereas in the latter case, a pronounced degradation of pulp carbohydrates to aliphatic acids was observed resulting in lower pulp properties.
dc.language.isoeng
dc.publisherMid Sweden University
dc.relation.ispartofseriesNordic Pulp and Paper Research Journal
dc.subject.otherHot-water pre-treatment
dc.subject.otherAliphatic acids
dc.subject.otherHemicelluloses
dc.subject.otherExtractives
dc.subject.otherMolar-mass distribution
dc.titleSulfur-free pulping of hot-water-extracted spruce sawdust
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201704051913
dc.contributor.laitosKemian laitosfi
dc.contributor.laitosDepartment of Chemistryen
dc.contributor.oppiaineSoveltava kemiafi
dc.contributor.oppiaineApplied Chemistryen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2017-04-05T15:15:05Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.format.pagerange41-48
dc.relation.issn0283-2631
dc.relation.numberinseries1
dc.relation.volume31
dc.type.versionpublishedVersion
dc.rights.copyright© 2016 the Authors. This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial License.
dc.rights.accesslevelopenAccessfi
dc.subject.ysometsäkuusi
dc.subject.ysohiilihydraatit
dc.subject.ysoligniini
jyx.subject.urihttp://www.yso.fi/onto/yso/p5552
jyx.subject.urihttp://www.yso.fi/onto/yso/p7171
jyx.subject.urihttp://www.yso.fi/onto/yso/p19011
dc.rights.urlhttps://creativecommons.org/licenses/by-nc/4.0/
dc.relation.doi10.3183/npprj-2016-31-01-p041-048


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© 2016 the Authors. This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial License.
Except where otherwise noted, this item's license is described as © 2016 the Authors. This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial License.