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Activation of dissolving cellulose pulp at low water content
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
AkzoNobel.
AkzoNobel.
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2015 (English)In: 4th EPNOE International Polysaccharide Conference: Polysaccharides and polysaccharide-based advance materials: from science to industry, 2015Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Mercerisation of cellulose by alkali treatment is the first step in modifying natural cellulose fibres into many commercial cellulosic materials. During treatment, the fiber transforms into a reactive and highly swollen material called alkali cellulose (Na-Cell). In case NaOH is washed out of the cellulose structure, Na-Cell turn into Cellulose II upon drying (Langan et al. 2001).

 

The aim of the present study was to gain a better understanding of the mercerisation of dissolving cellulose pulp at low water content. This has been done by spraying NaOH onto milled cellulose in a kneader, then washing the cellulose to neutrality to stop the reaction. After drying the transformation degree to cellulose II was analysed. The experiments include variation of temperature (30-60°C), reaction time (5 and 25 min), [NaOH] (45-55%), and NaOH:Cellulose molar ratio (0.8- 1.8). A combination of NIR Raman imaging and multivariate data analysis have been used to study the transformation degree.

 

To the authors’ knowledge, this is the first time the influence of NaOH: Cellulose molar ratio on the mercerisation process has been studied in a single model together with temperature, reaction time and [NaOH]. Our results indicate that increased NaOH: Cellulose molar ratio has a significant positive influence on transformation degree of dissolving cellulose pulp at low water content.

Place, publisher, year, edition, pages
2015.
Keywords [en]
cellulose ethers, mercerisation
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URN: urn:nbn:se:umu:diva-128509OAI: oai:DiVA.org:umu-128509DiVA, id: diva2:1052274
Conference
4th EPNOE International Polysaccharide Conference "Polysaccharides and polysaccharide-based advance materials: from science to industry". 2015, Warsaw, Poland
Available from: 2016-12-06 Created: 2016-12-06 Last updated: 2019-02-28Bibliographically approved

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Albán Reyes, Diana CarolinaSundman, OlaEliasson, Bertil
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