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Increasing pulp yield in kraft cooking of softwoods by high initial effective alkali concentration (HIEAC) during impregnation leading to decreasing secondary peeling of cellulose
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.ORCID iD: 0000-0002-8992-3623
2018 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434XArticle in journal (Refereed) In press
Abstract [en]

Pulp yield can be improved by a more homogeneous delignification of the chips, achieved by improved impregnation prior to the cooking stage. Complete and efficient impregnation is obtained by increasing the diffusion rate by means of an impregnation liquor with a high initial effective alkali concentration (HIEAC). In the present study, the effect of HIEAC in the impregnation was evaluated and compared to a reference impregnation procedure and a prolonged impregnation. After the various impregnation scenarios, the alkali concentration was always adjusted to the same level in the beginning of the cooking stage. Impregnation with a HIEAC resulted in yield improvements by 1-1.5% units, due to a higher cellulose yield and possibly also to higher yield of glucomannan. The HIEAC with an even alkali distribution within the chips prior to the cooking stage resulted in a more uniform delignification carbohydrate degradation. Yield increase obtained by uniform delignification is due to both decreased shives content as well as less secondary peeling.

Place, publisher, year, edition, pages
2018.
Keywords [en]
chemical composition, diffusion, high initial effective alkali concentration (HIEAC), homogeneous delignification, impregnation, kraft pulping, molecular mass distribution (MMD), peeling, pulp yield, softwood, Cellulose, Delignification, Kraft process, Kraft pulp, Molecular mass, Softwoods, Alkali concentrations, Chemical compositions, Diffusion rate, Kraft cooking, Molecular mass distributions, Pulp yields, Yield Improvement, Yield increase, Pulp cooking
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33965DOI: 10.1515/hf-2018-0011Scopus ID: 2-s2.0-85048776090OAI: oai:DiVA.org:ri-33965DiVA, id: diva2:1229997
Available from: 2018-07-02 Created: 2018-07-02 Last updated: 2018-07-02Bibliographically approved

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