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Activation of dissolving cellulose pulp at low water content
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
AkzoNobel.
AkzoNobel.
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2015 (Engelska)Ingår i: 4th EPNOE International Polysaccharide Conference: Polysaccharides and polysaccharide-based advance materials: from science to industry, 2015Konferensbidrag, Poster (med eller utan abstract) (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
2015.
Nyckelord [en]
cellulose ethers, mercerisation
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Identifikatorer
URN: urn:nbn:se:umu:diva-128509OAI: oai:DiVA.org:umu-128509DiVA, id: diva2:1052274
Konferens
4th EPNOE International Polysaccharide Conference "Polysaccharides and polysaccharide-based advance materials: from science to industry". 2015, Warsaw, Poland
Tillgänglig från: 2016-12-06 Skapad: 2016-12-06 Senast uppdaterad: 2019-02-28Bibliografiskt granskad

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Albán Reyes, Diana CarolinaSundman, OlaEliasson, Bertil

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