Influence of Hollander beater refining on xylan extraction from hardwood paper pulp by cold caustic extraction and xylanase treatment

Cellulose fibers’ complex and compact structure hinders the quantitative extraction of residual hemicelluloses from the fiber wall. In this study, hardwood kraft paper pulp was subjected to refining with a Hollander beater at different refining loads (3, 4.5, and 5.5 kg) in order to assess the impac...

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Bibliographic Details
Published in:Bioresources 2022-02, Vol.17 (1), p.908-921
Main Authors: Ngene, Gloria I., Roux, Jean-Claude, Lachenal, Dominique
Format: Article
Language:English
Subjects:
Alkalies
Cellulose
Cellulose fibers
Cellulose pulp
Chemical and Process Engineering
Chemical Sciences
Cold
Cooking
Engineering Sciences
Enzymes
Hardwoods
Hemicellulose
Laboratories
Mass distribution
Molecular weight
Morphology
Polymerization
Pulp
Pulp & paper industry
Xylan
Xylanase
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Summary:Cellulose fibers’ complex and compact structure hinders the quantitative extraction of residual hemicelluloses from the fiber wall. In this study, hardwood kraft paper pulp was subjected to refining with a Hollander beater at different refining loads (3, 4.5, and 5.5 kg) in order to assess the impact of refining load on xylan removal by cold caustic extraction. The refined pulp showed high water retention values and specific surface area, which increased accessibility and a correspondingly high degree of xylan removal. Coupling refining and cold caustic extraction (100 g/L soda) achieved over 50% more xylan removal than the unrefined pulp (3% against 7%, respectively). Furthermore, an improvement in xylan removal (79%) was achieved by implementing a one-pot simultaneous refining and cold caustic extraction treatment at half the time required for the sequential treatment and low soda concentration (60 g/L). Finally, the benefit of beating was also observed for xylanase treatment. Overall, the combined extractions made it possible to remove 85% of xylan from a conventional hardwood paper pulp giving rise to a high purity cellulose pulp with unimodal and narrow molecular mass distribution.
ISSN:1930-2126
1930-2126
DOI:10.15376/biores.17.1.908-921