| Towards a new concept of lignin condensation in kraft pulping. Initial results. | |
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MedLine Citation:
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PMID: 15587073 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Göran Gellerstedt; Andrea Majtnerova; Liming Zhang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Comptes rendus biologies Volume: 327 ISSN: 1631-0691 ISO Abbreviation: C. R. Biol. Publication Date: 2004 Sep-Oct |
Date Detail:
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Created Date: 2004-12-10 Completed Date: 2005-05-11 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 101140040 Medline TA: C R Biol Country: France |
Other Details:
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Languages: eng Pagination: 817-26 Citation Subset: IM |
Affiliation:
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Department of Fibre and Polymer Technology, Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden. ggell@pmt.kth.se |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Chromatography, Gel Industry / methods* Lignin / chemical synthesis*, chemistry* Magnetic Resonance Spectroscopy Sulfur / pharmacology |
| Chemical | |
Reg. No./Substance:
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7704-34-9/Sulfur; 8068-05-1/Kraft lignin; 9005-53-2/Lignin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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