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Fibre stress-strain response of high temperature chemi-thermomechanical pulp treated with switchable ionic liquids
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.ORCID iD: 0000-0003-3407-7973
Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Umeå University; Laboratory of Industrial Chemistry and Reaction Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Finland.
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2016 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 11, no 4, 8570-8588 p.Article in journal (Refereed) Published
Abstract [en]

The removal of lignin from a high-temperature chemi-thermomechanical pulp (HT-CTMP) using a switchable ionic liquid prepared from an organic superbase (1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)), monoethanol amine (MEA), and SO2 was investigated. The objective was to measure the fibre properties before and after removal of the lignin to analyse the contributions from lignin in the HT-CTMP fibre to the tensile properties. It was found that the fibre displacement at break - measured in zero span, which is related to fibre strain at break - was not influenced by the lignin removal in this ionic liquid system when tested dry. There was a small increase in displacement at break and a reduction in tensile strength at zero span when tested after rewetting. At short span, the displacement at break decreased slightly when lignin was removed, while tensile strength was almost unaffected when tested dry. Under rewetted conditions, the displacement at break increased and tensile strength decreased after lignin removal. Nevertheless, no dramatic differences in the pulp properties could be observed. Under the experimental conditions, treatment with the ionic liquid reduced the lignin content from 37.4 to 15.5 wt%.

Place, publisher, year, edition, pages
2016. Vol. 11, no 4, 8570-8588 p.
Keyword [en]
Ionic liquid, Delignification, Spruce, Cellulose, Zero span, Short span
National Category
Engineering and Technology Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-28633DOI: 10.15376/biores.11.4.8570-8588ISI: 000391801300037OAI: oai:DiVA.org:miun-28633DiVA: diva2:1046839
Available from: 2016-11-15 Created: 2016-08-26 Last updated: 2017-08-08Bibliographically approved
In thesis
1. On Shaping Mechanical Properties of Lignocellulosic Materials by Benign Chemical Processing
Open this publication in new window or tab >>On Shaping Mechanical Properties of Lignocellulosic Materials by Benign Chemical Processing
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2016. 33 p.
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 124
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-29721 (URN)978-91-88025-72-2 (ISBN)
Presentation
2016-06-03, O102, Sundsvall, 10:15 (English)
Supervisors
Note

Vid tidpunkten för framläggningen var följande delarbeten opublicerade: delarbete 1  inskickat, delarbete 3 manuskript.

At the time of the defence the following papers were unpublished: paper 1  submitted, paper 3 manuscript.

Available from: 2016-12-21 Created: 2016-12-21 Last updated: 2016-12-21Bibliographically approved

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Duan, RanWesterlind, BoNorgren, Magnus
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