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Towards a new concept of lignin condensation in kraft pulping. Initial results
KTH, Superseded Departments, Fibre and Polymer Technology.
KTH, Superseded Departments, Fibre and Polymer Technology.
KTH, Superseded Departments, Fibre and Polymer Technology.
2004 (English)In: Comptes rendus. Biologies, ISSN 1631-0691, E-ISSN 1768-3238, Vol. 327, no 9-10, 817-826 p.Article in journal (Refereed) Published
Abstract [en]

In kraft pulping, a comparatively large amount of lignin remains in the fibres after the cook. Based on various analytical techniques for lignin, such as thioacidolysis, GPC and NMR, it is suggested that lignin condensation reactions take place during the cook. The reaction seems, however, not to involve ionic intermediates as has been suggested previously but rather a one-electron mechanism with elemental sulphur as the initiator. Support for such a reaction has been found through kraft cooks in the presence of an added phenol, 2,6-xylenol, as well as through NMR analysis of kraft lignin. It was found that the added phenol is incorporated in the pulp lignin with linkages indicative of radical coupling. Furthermore, kraft lignin was found to contain substantial amounts of chemically linked fatty acids. By complementary analyses of sulphur and polysulphide in an industrial black liquor, the presence of these compounds throughout a kraft cook was demonstrated.

Place, publisher, year, edition, pages
2004. Vol. 327, no 9-10, 817-826 p.
Keyword [en]
Condensation, Electron transfer reactions, Fatty acids, GPC, Kraft pulping, NMR analysis, Phenols, Thioacidolysis
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-5372DOI: 10.1016/j.crvi.2004.03.011ISI: 000225355200007Scopus ID: 2-s2.0-9244265580OAI: oai:DiVA.org:kth-5372DiVA: diva2:9721
Note
QC 20101004Available from: 2006-02-14 Created: 2006-02-14 Last updated: 2017-11-21Bibliographically approved
In thesis
1. On the structure of residual lignin in kraft pulping
Open this publication in new window or tab >>On the structure of residual lignin in kraft pulping
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 41 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2005:43
Keyword
biphenyl structures, kappa number, kraft pulping, phenols, radical coupling, residual delignificaiton, residual lignin, softwood
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-3855 (URN)
Presentation
2006-02-09, E2, KTH, Lindstedtsvägen 3, Stockholm, 10:00
Note
QC 20101213Available from: 2006-02-14 Created: 2006-02-14 Last updated: 2010-12-13Bibliographically approved

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