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Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage
RISE, Innventia. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-8992-3623
RISE, Innventia.
2016 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 70, no 11, p. 1031-1037Article 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
2016. Vol. 70, no 11, p. 1031-1037
Keywords [en]
carbohydrate composition, homogeneous delignification, impregnation, kraft pulping, pulp yield, softwood pulping
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-26206DOI: 10.1515/hf-2016-0020Scopus ID: 2-s2.0-84994176220OAI: oai:DiVA.org:ri-26206DiVA, id: diva2:1049682
Available from: 2016-11-25 Created: 2016-11-25 Last updated: 2020-12-01Bibliographically approved

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Brännvall, Elisabet

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