Wood Science and Technology

, Volume 16, Issue 2, pp 139–153 | Cite as

Topochemistry of delignification in Douglas-fir wood with soda, soda-anthraquinone and karft pulping as determined by SEM-EDXA

  • S. Saka
  • R. J. Thomas
  • J. S. Gratzl
  • D. Abson
Article
Received:

Summary

Delignification studies on 0.5 μm sections of Douglas-fir earlywood tracheids pulped by soda, soda-anthraquinone (soda/AQ) and kraft pulping processes were performed by determining bromine concentrations in various morphological regions with SEM-EDXA technique. Soda/AQ pulping was much more selective in removing lignin from the middle lamella regions than either soda or kraft pulping. However, up to 50% delignification, more lignin was removed from the secondary wall by soda or kraft, compared to soda/AQ pulping. The kinetics of lignin removal in the various morphological regions were established. Addition of AQ and sodium sulfide resulted in an earlier transition from a slow initial to a rapid bulk delignification, particularly in the middle lamella, and in an enhanced bulk delignification in the secondary wall. Anthraquinone was also found to promote residual delignification in the secondary wall, where sodium sulfide was not effective. The opposite was observed for the bulk delignification in the middle lamella, where only sodium sulfide addition improved the rate significantly. The great differences observed in the bulk delignification rates between middle lamella and secondary wall in soda pulping as well as their response to additives suggest structural differences between middle lamella and secondary wall lignins.

Keywords

Lignin Anthraquinone Secondary Wall Kraft Pulp Middle Lamella 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • S. Saka
    • 1
  • R. J. Thomas
    • 2
  • J. S. Gratzl
    • 2
  • D. Abson
    • 3
  1. 1.Pulp and Paper Research Insitute of Canada and Department of ChemistryMcGill UniversityMontrealCanada
  2. 2.Department of Wood and Paper ScienceNorth Carolina State UniversityRaleighUSA
  3. 3.Weyerhaeuser Technology CenterWeyerhaeuser CompanyTacomaUSA

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