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Viscose production: Impact from alkali resistance (R18) and hemicellulose content in dissolving cellulose on the processability and quality of viscose.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2012 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this study the influence of variations in alkali resistance (R18) of cellulose on the

quality of the viscose product in terms of carbohydrate content have been examined. The

dissolution pattern of hemicellulose in the first steps of the viscose process with different

running parameters has been determined. Furthermore the correlation between R18 and

hemicellulose content has been studied. Mercerization and pressing was performed in a

viscose micro plant at MoRe Research with varying process settings using samples with

different R18 and known carbohydrate content. The carbohydrate content was thereafter

determined in both the deducted lye and in the alkali cellulose in order to study the

dissolution pattern of hemicellulose. A comparison was made in terms of carbohydrate

content between speciality celluloses with varying R18 for determining the correlation

between the variables. The study showed a clear influence from R18 on the amount of

hemicellulose continuing in the viscose process after the pressing. Variations in NaOHconcentration

in the mercerization and the press factor in pressing have also a significant

effect on the dissolution of hemicellulose while the temperature in mercerization did not

have a distinguishable impact. Finally the study also indicated a linear relationship

between R18 and the hemicellulose content in speciality cellulose from Domsjö Fabriker.

Place, publisher, year, edition, pages
2012. , 35 p.
Keyword [en]
National Category
Chemical Engineering
URN: urn:nbn:se:umu:diva-55055OAI: diva2:525277
Educational program
Master of Science Programme in Engineering Chemistry
Physics, Chemistry, Mathematics
Available from: 2012-05-07 Created: 2012-05-07 Last updated: 2012-05-07Bibliographically approved

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