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Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. Innventia AB.ORCID iD: 0000-0002-8992-3623
Innventia AB.
2016 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 70, no 11, 1031-1037 p.Article in journal (Refereed) Published
Abstract [en]

A pulp yield increase up to 2% can be achieved by impregnation with a liquor containing 2 M effective alkali ( EA) concentration instead of 1 M. The yield increase is due to higher cellulose and glucomannan contents in the pulp, which can be rationalized by less yield loss by peeling, as impregnation is more effective at an elevated EA level. A rapid loading of chips with alkali can be realized due to a high diffusion rate. When the temperature becomes higher in the cooking stage, enough alkali is available for delignification reactions without the risk of alkali depletion in the chip core, so that the delignification is more homogeneous.

Place, publisher, year, edition, pages
Walter de Gruyter, 2016. Vol. 70, no 11, 1031-1037 p.
Keyword [en]
carbohydrate composition, homogeneous delignification, impregnation, kraft pulping, pulp yield, softwood pulping
National Category
Paper, Pulp and Fiber Technology
URN: urn:nbn:se:kth:diva-196381DOI: 10.1515/hf-2016-0020ISI: 000385809600004OAI: diva2:1046552

QC 20161114

Available from: 2016-11-14 Created: 2016-11-14 Last updated: 2016-11-14Bibliographically approved

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Brännvall, Elisabet
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