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The effects of fines content and hydrogen sulphide gas pre-treatment on kraft pulping and the strength of polysulphide pulps
KTH, Superseded Departments, Pulp and Paper Technology.ORCID iD: 0000-0002-8992-3623
2000 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2000. , 28 p.
Series
Trita-PMT, 2000:10
Keyword [en]
Bleachhability, Delignification, Fines, Hydrogen sulphide pre-treatment, Kraft pulping, Mechanical properties, Polysulphide, Softwood, Yield
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-1144OAI: oai:DiVA.org:kth-1144DiVA: diva2:6930
Presentation
(English)
Note
QC 20100520Available from: 2001-04-09 Created: 2001-04-09 Last updated: 2010-05-20Bibliographically approved
List of papers
1. Effect of primary fines on cooking and TCF-bleaching
Open this publication in new window or tab >>Effect of primary fines on cooking and TCF-bleaching
1999 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 14, no 3, 209-213 p.Article in journal (Refereed) Published
Abstract [en]

When pulp is separated into fibre fractions on the basis of size, the smallest fraction obtained is called fines. Primary fines are found in cooked pulp not subjected to beating and secondary fines are created in the cause of beating. Fines have higher lignin and metal ion contents than the fibre fractions of the pulp. In this study, the effect of the primary fines on cooking and bleaching has been investigated. The results showed that removal of the primary fines during cooking had no positive effect on the delignification. The pulp viscosity at a certain kappa number and the H-factor to reach this kappa number were the same, regardless of whether or not the primary fines were present. However, the primary fines had a profound effect on bleaching when a QP sequence was used. An increase of approximately 2 ISO-brightness units was obtained by removing the primary fines prior to bleaching. Pulps with and without primary fines showed no significant difference in metal ion content or light scattering coefficient. The light absorption coefficient was, however, higher in the pulp with fines. The improved bleachability of the pulps without fines was therefore probably caused by differences in lignin content and in the lignin structure rather than by differences in metal ion content.

Keyword
(primary) fines, cooking, bleachability, kraft pulp, lignin, SURFACE MATERIAL, KRAFT FIBERS, SPRUCE, PARTS
Identifiers
urn:nbn:se:kth:diva-12968 (URN)000082959800005 ()
Note
QC 20100520Available from: 2010-05-20 Created: 2010-05-20 Last updated: 2010-05-20Bibliographically approved
2. hydrogen sulphide gas pre-treatment prior to modified kraft cooking
Open this publication in new window or tab >>hydrogen sulphide gas pre-treatment prior to modified kraft cooking
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-12969 (URN)
Note
QC 20100520Available from: 2010-05-20 Created: 2010-05-20 Last updated: 2010-05-20Bibliographically approved
3. Strykepotentialen hos massor från polysulfidkok: Del 1. Variationer i vätesulfid- och hydroxidjonhalt
Open this publication in new window or tab >>Strykepotentialen hos massor från polysulfidkok: Del 1. Variationer i vätesulfid- och hydroxidjonhalt
(English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH
Series
PMT-rapport
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-12970 (URN)
Note
QC 20100520Available from: 2010-05-20 Created: 2010-05-20 Last updated: 2010-05-20Bibliographically approved
4. Strykepotentialen hos massor från polysulfidkok: Del 2. Massa- och fiberegenskaper
Open this publication in new window or tab >>Strykepotentialen hos massor från polysulfidkok: Del 2. Massa- och fiberegenskaper
(English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH
Series
PMT-rapport
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-12971 (URN)
Note
QC 20100520Available from: 2010-05-20 Created: 2010-05-20 Last updated: 2010-05-20Bibliographically approved

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Brännvall, Elisabet

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Output format
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