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A comparison of cold and hot caustic extraction of a spruce dissolving sulfite pulp prior to final bleaching
BillerudKorsnäs AB.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
2013 (English)In: Appita journal, ISSN 1038-6807, Vol. 66, no 3, 229-234 p.Article in journal (Refereed) Published
Abstract [en]

A magnesium sulfite pulp producer modified its pulping process to dissolving pulping in 2011 and needed a purification stage after the digester to obtain a sufficiently low hemicellulose content. The dissolving pulp was intended for viscose production and an R-18 value of at least 95% and an intrinsic viscosity below 550 dm(3)/kg was requested. The results showed, as could be expected, a correlation between lower dissolving pulp yield and a higher degree Of purification with respect to cellulose. The R-18 values and the intrinsic viscosities of the dissolving pulps were found to increase with increasing sodium hydroxide concentration and/or higher temperature in the extraction Stage. The pulp yield was found to be higher with higher temperature for the cold caustic extraction stage (CCE); for hot caustic extraction (HQ E) the pulp yield became lower with higher temperature. The specified R-18 value was easiest to reach using hot caustic extraction.

Place, publisher, year, edition, pages
Appita , 2013. Vol. 66, no 3, 229-234 p.
Keyword [en]
caustic extraction, caustic purification, cellulose, dissolving pulp, hemicellulose, spruce, sulfite
National Category
Chemical Engineering Other Chemical Engineering
Research subject
Chemical Engineering
URN: urn:nbn:se:kau:diva-38607ISI: 000321998100022OAI: diva2:875044
Available from: 2015-11-30 Created: 2015-11-23 Last updated: 2016-08-17Bibliographically approved

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Germgård, Ulf
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