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Träfflista för sökning "L773:1631 0691 OR L773:1768 3238 srt2:(2000-2004)"

Search: L773:1631 0691 OR L773:1768 3238 > (2000-2004)

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1.
  • Gellerstedt, Göran, et al. (author)
  • Towards a new concept of lignin condensation in kraft pulping. Initial results
  • 2004
  • In: Comptes rendus. Biologies. - : Elsevier BV. - 1631-0691 .- 1768-3238. ; 327:9-10, s. 817-826
  • Journal article (peer-reviewed)abstract
    • 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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2.
  • Tyrcha, Joanna (author)
  • Cell cycle progression
  • 2004
  • In: Comptes Rendues: Biologies. - : Elsevier BV. - 1631-0691. ; :327, s. 193-200
  • Journal article (peer-reviewed)
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Gellerstedt, Göran (1)
Tyrcha, Joanna (1)
Zhang, Liming (1)
Majtnerova, Andrea (1)
University
Royal Institute of Technology (1)
Stockholm University (1)
Language
English (2)
Research subject (UKÄ/SCB)
Engineering and Technology (1)
Year
2004 (2)

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