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Study of the oxygen effect on mechanical pulp lignin using an improved lignin isolation method

  • Nathalie Marlin , Dominique Lachenal , Laurence Magnin and Marie-Christine Brochier-Salon
Published/Copyright: June 1, 2005
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Holzforschung
From the journal Volume 59 Issue 2

Abstract

Lignins from kraft and mechanical pulps were isolated before and after oxygen treatment with conventional methods (acidolysis and enzymatic isolation) and with a novel two-step method combining an enzymatic treatment and acidolysis. Results showed that the combined enzymatic hydrolysis-acidolysis made it possible to extract lignin from pulp with a better yield than acidolysis alone and with a higher degree of purity than after enzymatic hydrolysis alone. The lignin samples isolated with the two-step method were analysed by 13C NMR, 19F NMR and by gel permeation chromatography. It was shown that the behaviour of mechanical pulp lignin during oxygen treatment was different from that of kraft pulp lignin. Most of these differences could be explained by the lower phenolic content and larger molecular size of the mechanical pulp lignin. As a consequence, oxygen had a poor delignifying effect. Finally, 19F NMR spectroscopy showed that oxygen could destroy some quinones induced by the alkaline conditions of the O stage.

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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
  5. A comparative study on the degradation of cotton linters induced by carbonate and hydroxyl radicals generated from peroxynitrite
  6. The carbonate radical as one-electron oxidant of carbohydrates in alkaline media
  7. Leaf-fiber lignins of Phormium varieties compared bysolid-state 13C NMR spectroscopy
  8. Antifungal activity of iridoid glycosides from the heartwood of Gmelina arborea
  9. Antioxidant activity of different components of pine species
  10. Dislocations in Norway spruce fibres and their effect on properties of pulp and paper
  11. Isolation and identification of antifungal compounds from Amboyna wood
  12. Biomechanical pulping of spruce wood chips with Streptomyces cyaneus CECT 3335 and handsheet characterization
  13. Three-dimensional visualisation of bacterial decay in individual tracheids of Pinus sylvestris
  14. Mass loss and moisture dynamics of Scots pine (Pinus sylvestris L.) exposed outdoors above ground in Sweden
  15. The influence of cation and anion structure of new quaternary ammonium salts on adsorption and leaching
  16. Speciation of arsenic and chromium in the leachate from chromated copper arsenate (CCA) type C treated southern pine (Pinus spp.)
  17. Metal chelation studies relevant to wood preservation.1. Complexation of propyl gallate with Fe2+
  18. Comparison of UV and confocal Raman microscopy to measure the melamine–formaldehyde resin content within cell walls of impregnated spruce wood
  19. Comparison of Pinus taeda L. wood property calibrations based on NIR spectra from the radial-longitudinal and radial-transverse faces of wooden strips
  20. Detection of failures of adhesively bonded joints using the acoustic emission method
  21. Effect of cross-sectional change of a board specimen on stress wave velocity determination
  22. Comments on the experimental methodology for determination of the hygro-mechanical properties of wood
  23. Properties of chemically and mechanically isolated fibres of spruce (Picea abies [L.] Karst.). Part 1: Structural and chemical characterisation
  24. Properties of chemically and mechanically isolated fibres of spruce (Picea abies[L.] Karst.). Part 2: Twisting phenomena
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