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The effect of modifying the oxidative pre-aging conditions in the manufacture of viscose from wood pulp
Karlstad University, Faculty of Technology and Science.
Karlstad University, Faculty of Technology and Science.
Svenska Rayon AB, Sverige.
2006 (English)In: Paperi ja puu, ISSN 0031-1243, Vol. 88, no 3, 175-180 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2006. Vol. 88, no 3, 175-180 p.
Identifiers
URN: urn:nbn:se:kau:diva-1943OAI: oai:DiVA.org:kau-1943DiVA: diva2:5123
Available from: 2007-12-17 Created: 2007-12-17 Last updated: 2010-09-09Bibliographically approved
In thesis
1. Activation of dissolving pulps prior to viscose preparation
Open this publication in new window or tab >>Activation of dissolving pulps prior to viscose preparation
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The conventional viscose manufacturing process is a mature process that needs to be improved with respect to its environmental impact and its production cost structure. Therefore a research study has been done with the aim to improve the reactivity of the dissolving pulp used, in order to reduce the chemical demand in the viscose process and thus reduce the cost and indirectly the environmental impact.

The work described in this thesis has shown that it is possible to enhance the pulp reactivity and to use less carbon disulphide in the production of viscose, while maintaining a good quality viscose dope, by two entirely different pretreatment methods, one chemical and one enzymatic.

The chemical method used pressurized oxygen after the mercerisation step, which increased the reactivity of the alkali cellulose. The viscose dopes produced from the pressurized oxygen treated alkali cellulose had lower filter clogging values, Kw, compared to conventionally produced viscoses. The temperature and the oxygen treatment time of the alkali cellulose were however crucial for the viscose quality.

The best performing enzyme of several tested was a cellulase of the mono component endoglucanase preparation Carezyme®. This enzymatic treatment was optimized with respect to viscose dope preparation. The study showed that the enzyme treatment could be carried out under industrially interesting conditions with respect to temperature, enzyme dose and reaction time. A re-circulation study of the enzyme showed that it was possible to re-use the spent press water from the enzymatic treatment step several times, and thus lower the production cost. Some of the viscose process stages were modified to properly fit the enzymatically treated dissolving pulp and a comparison between viscose made from enzyme-treated pulp and viscose made from conventional pulp, showed that the enzyme-treated samples had a lower filter clogging value, Kw. This indirectly indicates that the enzyme pretreatment could reduce the carbon disulphide charge in the viscose manufacturing process. An initial study of how the Carezyme® influenced different cellulosic sources was also performed.

Place, publisher, year, edition, pages
Fakulteten för teknik- och naturvetenskap, 2007
Series
Karlstad University Studies, ISSN 1403-8099 ; 2007:46
Keyword
dissolving pulp, enzyme, reactivity, viscose
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1276 (URN)978-91-7063-150-4 (ISBN)
Public defence
2007-12-14, Ericssonsalen, 9, Universitetsgatan 1, Karlstad, 13:00
Opponent
Supervisors
Available from: 2007-12-17 Created: 2007-12-17

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