Activation of dissolving cellulose pulp at low water contentVise andre og tillknytning
2015 (engelsk)Inngår i: 4th EPNOE International Polysaccharide Conference: Polysaccharides and polysaccharide-based advance materials: from science to industry, 2015Konferansepaper, Poster (with or without abstract) (Annet vitenskapelig)
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.
sted, utgiver, år, opplag, sider
2015.
Emneord [en]
cellulose ethers, mercerisation
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-128509OAI: oai:DiVA.org:umu-128509DiVA, id: diva2:1052274
Konferanse
4th EPNOE International Polysaccharide Conference "Polysaccharides and polysaccharide-based advance materials: from science to industry". 2015, Warsaw, Poland
2016-12-062016-12-062022-03-02bibliografisk kontrollert