LAPSE:2019.0615
Published Article
LAPSE:2019.0615
Effects of Caustic Extraction on Properties of Viscose Grade Dissolving Pulp
Cindy Friebel, Robert H. Bischof, Gabriele Schild, Karin Fackler, Ireen Gebauer
July 5, 2019
Viscose, a cellulose-based commodity fibre, is produced by pulping and bleaching of wood, yielding a high quality “dissolving pulp” which is then spun. During pulping and bleaching, effective hemicellulose extraction is required to allow fibre production. We present a design of experiments (DoE) approach to optimise caustic extraction in a total chlorine free (TCF) bleaching sequence (O-CE-Z-P) of beech wood sulphite pulp. Temperature and sodium hydroxide concentration were varied to identify highest xylan extraction yield, and a maximum xylan removal of 83% was achieved at 20 °C and 120 g/L NaOH. Additionally, caustic extraction conditions were derived from the DoE model that led to pulps with high yield, high alpha cellulose content or uniform cellulose molecular weight distribution. Pulps from verification experiments exhibited good reactivity in viscose application tests. Hence, the presented O-CE-Z-P bleaching sequence can be considered as suitable for integrated viscose fibre production. We assume that the presented caustic extraction model will be useful for pulp and biorefinery researchers who work on caustic biorefinery processes involving hardwood feedstocks.
Keywords
caustic extraction, cellulosic fibres, dissolving pulp, pulp, textile fibres, viscose, wood
Subject
Suggested Citation
Friebel C, Bischof RH, Schild G, Fackler K, Gebauer I. Effects of Caustic Extraction on Properties of Viscose Grade Dissolving Pulp. (2019). LAPSE:2019.0615
Author Affiliations
Friebel C: Kompetenzzentrum Holz GmbH, Altenberger Straße 69, 4040 Linz, Austria
Bischof RH: Lenzing AG, Werkstraße 1, 4860 Lenzing, Austria
Schild G: Lenzing AG, Werkstraße 1, 4860 Lenzing, Austria
Fackler K: Lenzing AG, Werkstraße 1, 4860 Lenzing, Austria
Gebauer I: Kompetenzzentrum Holz GmbH, Altenberger Straße 69, 4040 Linz, Austria; Fraunhofer Center for Chemical-Biotechnological Processes CBP, Am Haupttor, Building 1251, 06237 Leuna, Germany [ORCID]
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Journal Name
Processes
Volume
7
Issue
3
Article Number
E122
Year
2019
Publication Date
2019-02-27
Published Version
ISSN
2227-9717
Version Comments
Original Submission
Other Meta
PII: pr7030122, Publication Type: Journal Article
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LAPSE:2019.0615
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doi:10.3390/pr7030122
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Jul 5, 2019
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CC BY 4.0
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[v1] (Original Submission)
Jul 5, 2019
 
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Jul 5, 2019
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https://psecommunity.org/LAPSE:2019.0615
 
Original Submitter
Calvin Tsay
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