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Träfflista för sökning "L773:0576 9787 srt2:(2000-2004)"

Search: L773:0576 9787 > (2000-2004)

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1.
  • Gustavsson, Catrin, et al. (author)
  • On the nature of residual lignin
  • 2004
  • In: Cellulose chem. techmol.. - 0576-9787. ; 35, s. 321-331
  • Journal article (peer-reviewed)abstract
    • In a recent study, the results of oxygen delignification trials on kraft, prehydrolysis kraft and magnesium sulphite pulps were compared, thus providing the basis for a theory on the nature of the lignin residual lignin remaining in pulp after cooking, and particularly after oxygen delignification, the so-called residual lignin. It is suggested that, at least after oxygen delignification, the residual lignin effectively consists of LCC-bound monolignins, a theory relating to the efficiency of oxygen delignification and bleaching, and indicating possible strategies for improving the efficiency of such processes. An efficient means of breaking the LCC bonds would lead to a more efficient bleaching, known as requiring either a complete oxidation of the LCC-bound monolignins or a peeling off the carbohydrate binding to the LCC. In any case, a mere breaking of one unsaturated bond in an aromatic ring is not sufficient to achieve depolymerisation of the residual lignin or an efficient kappa reduction.
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2.
  • Rognes, H., et al. (author)
  • Optimization of flax fiber separation by leaching
  • 2000
  • In: Cellulose Chemistry and Technology. - 0576-9787. ; 34:04-mar, s. 331-340
  • Journal article (peer-reviewed)abstract
    • The abilities of four chelators to separate bast fibers of non-retted oilseed flax from each other and the core and cuticle have been investigated at different pH level. EDTAand DTPA separate fibers efficiency at pH 10. Addition of a strong detergent (Sodium dodecyl sulphate, SDS) or sodium chloride further increased the fiber separation and so delignifying compounds hydrogen peroxide and sodium sulfite. A mixture of EDTA, SDS and hydrogen peroxide gave a complete fiber separation within 2 h at 70 degrees and pH 10. The fibers in the woody core of the flax straw did not separate under these conditions. The mechanistic background to fiber separation is discussed.
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