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Evaluation of Kraft-PS Cooking for Eucalypt and Pine Wood Chip Mixtures
Univ Fed Vicosa, Dept Forestry Engn, Vicosa, MG, Brazil..
Univ Fed Vicosa, Dept Forestry Engn, Vicosa, MG, Brazil..
Univ Fed Vicosa, Dept Forestry Engn, Vicosa, MG, Brazil..
Univ Fed Vicosa, Dept Forestry Engn, Vicosa, MG, Brazil..
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2019 (English)In: Journal of wood chemistry and technology, ISSN 0277-3813, E-ISSN 1532-2319, Vol. 39, no 3, p. 149-165Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was evaluating polysulfides (PS) as additives in kraft cooking of wood mixtures eucalypt (E) and pine chips (P) wood mixtures, namely: 50E/50P, 70E/30P, and 90E/10P. Bleaching (O(D/A)(EP)D) and refining of pulps were also investigated. The PS addition (1.5 or 3.0%) to the kraft cooking preserved the hemicelluloses resulting increased pulp yield and reduced H-factor. The oxygen delignification was more efficient for chip mixtures containing higher proportion of pine chips, but was not largely affected by the addition of PS. The bleach chemical consumption was not significantly influenced by PS dosage or by the wood chip mixture. The burst and tear indexes were improved by increasing the proportion of pine chips to the mixture, but an opposite effect was observed for refinability, tensile index, and opacity. The kraft-PS pulps showed increased refinability, tensile, and burst strengths in relation the standard pulps, but lower opacities.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS INC , 2019. Vol. 39, no 3, p. 149-165
Keywords [en]
Eucalypt, pine, polysulfides charge, pulp chemistry, pulp strength
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-252616DOI: 10.1080/02773813.2018.1533979ISI: 000467859800001Scopus ID: 2-s2.0-85058788205OAI: oai:DiVA.org:kth-252616DiVA, id: diva2:1319628
Note

QC 20190603

Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-03Bibliographically approved

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de Carvalho, Danila Morais

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