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The role of non-phenolic lignin in chlorate-forming reactions during chlorine dioxide bleaching of softwood kraft pulp

  • Doug R. Svenson , Hou-min Chang , Hasan Jameel and John F. Kadla
Published/Copyright: June 1, 2005
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Holzforschung
From the journal Volume 59 Issue 2

Abstract

The affect of phenolic hydroxyl groups on the reaction efficiency during chlorine dioxide pre-bleaching of a softwood kraft pulp was investigated. The removal of phenolic hydroxyl groups via pulp methylation did not adversely affect the chlorine dioxide bleaching efficiency or the amount of chlorate formed during exposure to chlorine dioxide. Ion analysis of the reaction systems revealed that the formation of chloride and chlorite ions during the bleaching process were very similar between the kraft and methylated kraft pulps. These results indicate that the kinetic rates of lignin oxidation by chlorine dioxide and its reduction products, chlorite and hypochlorous acid, are much faster than the rate of inorganic reactions leading to chlorate formation.

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Published Online: 2005-06-01
Published in Print: 2005-02-01

©2005 by Walter de Gruyter Berlin New York

Articles in the same Issue

  1. Obituary
  2. The role of non-phenolic lignin in chlorate-forming reactions during chlorine dioxide bleaching of softwood kraft pulp
  3. Study of the oxygen effect on mechanical pulp lignin using an improved lignin isolation method
  4. Quantitative 1H NMR analysis of alkaline polysulfide solutions
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  7. Leaf-fiber lignins of Phormium varieties compared bysolid-state 13C NMR spectroscopy
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  14. Mass loss and moisture dynamics of Scots pine (Pinus sylvestris L.) exposed outdoors above ground in Sweden
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  16. Speciation of arsenic and chromium in the leachate from chromated copper arsenate (CCA) type C treated southern pine (Pinus spp.)
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  23. Properties of chemically and mechanically isolated fibres of spruce (Picea abies [L.] Karst.). Part 1: Structural and chemical characterisation
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