Startseite Kinetics of SO2-ethanol-water pulping of spruce 10th EWLP, Stockholm, Sweden, August 25–28, 2008
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Kinetics of SO2-ethanol-water pulping of spruce 10th EWLP, Stockholm, Sweden, August 25–28, 2008

  • Mikhail Iakovlev , Timo Pääkkönen und Adriaan van Heiningen
Veröffentlicht/Copyright: 15. November 2009
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Aus der Zeitschrift Band 63 Heft 6

Abstract

SO2-ethanol-water (SEW) pulping is a promising fractionation process for lignocellulosics to produce pulp and value-added chemicals as a contribution to the concept of forest biorefinery. The presence of SO2 leads to dissolution of hemicelluloses in high yield mostly as monomeric sugars, while lignin becomes soluble through sulfonation. After lignin removal, the dissolved sugars may be used as feedstock for fermentation to ethanol or butanol. SEW pulping may be considered a hybrid between solvent pulping (organosolv pulping by solvolysis) and acid sulfite pulping. Absence of an inorganic base leads to simplification of the recovery cycle. Furthermore, alcohol increases the impregnation rate of dissolved SO2 into wood, so that a separate impregnation phase is not necessary. Also, the presence of SO2 allows cooking of softwoods, while ethanol pulping is limited to hardwoods. Thus, SEW pulping may be applied to a wide variety of lignocellulosics at lower temperatures and similar cooking times than those used in kraft pulping. In the present study, SEW pulping experiments were performed on spruce chips at cooking temperatures of 135–165°C with a 12% SO2 solution at a liquor-to-wood ratio of 6:1 l kg-1. The effect of cooking temperature and time on kappa number, yield, and intrinsic viscosity of the pulp was determined. Based on these results, the kinetics of delignification, hemicelluloses removal, and cellulose hydrolytic destruction were established.

Keywords: biorefinery; cellulose degree of polymerization; delignification; ethanol; kinetics; organosolv pulping; sulfur dioxide
Corresponding author. Department of Forest Products Technology, Helsinki University of Technology, PL 6300, 02015 TKK, Espoo, Finland
Received: 2008-10-15
Accepted: 2009-5-11
Published Online: 2009-11-15
Published Online: 2009-07-31
Published in Print: 2009-11-01

©2009 by Walter de Gruyter Berlin New York

Artikel in diesem Heft

  1. Original Papers
  2. Effects of selected key chromophores on cellulose integrity upon bleaching 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  3. A novel, mild and selective methylation of carboxyl groups in cellulosic pulps 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  4. Effect of salts on the formation and properties of microcrystalline cellulose and chitosan gels 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  5. Detection of muconic acid type structures in oxidised lignins using 2D NMR spectroscopy 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  6. Synthesis of a lignin polymer model consisting of only phenolic β-O-4 linkages and testing its reactivity under alkaline conditions 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  7. HSQC-NMR analysis of lignin in woody (Eucalyptus globulus and Picea abies) and non-woody (Agave sisalana) ball-milled plant materials at the gel state 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  8. Syringyl-type simple plant phenolics as mediating oxidants in laccase catalyzed degradation of lignocellulosic materials: Model compound studies 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  9. Titration of free phenolic groups in pulps 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  10. Interfacial properties of polyelectrolyte complexes incorporating kraft lignin 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  11. Comparing soluble Trametes pubescens laccase and cross-linked enzyme crystals (CLECs) for enzymatic modification of cellulose 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  12. Exploring enzymatic treatments for the production of dissolving grade pulp from different wood and non-wood paper grade pulps 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  13. Effects of commercial cellobiohydrolase treatment on fiber strength and morphology of bleached hardwood pulp 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  14. Prehydrolysis of Eucalyptus globulus Labill. hemicelluloses prior to pulping and fermentation of the hydrolysates with the yeast Pichia stipitis 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  15. Activation of thermomechanical pulp by laccases as studied by UV-Vis, UV resonance Raman and FTIR spectroscopy 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  16. Biological control of sapstain fungi: From laboratory experiments to field trials 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  17. Study of the sorption-desorption properties of pine wood at the initial stage of decay by wood-rot fungi 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  18. Decay susceptibility of Amazon wood species from Brazil against white rot and brown rot decay fungi 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  19. Relations between chemical changes and mechanical properties of thermally treated wood 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  20. Kinetics of SO2-ethanol-water pulping of spruce 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  21. Study on desorption of Mn, Fe, and Mg from TMP and evaluation of the complexing strength of different chelating agents using side reaction coefficients 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  22. Short Note
  23. Determination of self-diffusion coefficient and hydrodynamic radius of xylan by NMR diffusometry (NMRd) 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  24. Meetings
  25. Meetings
  26. Contents Volume 63
  27. Contents Volume 63 (2009)
  28. Subject index
  29. Subject index
  30. Species index (scientific names)
  31. Species index (scientific names)
  32. Author index
  33. Author index
  34. Acknowledgement
  35. Acknowledgement
https://doi.org/10.1515/HF.2009.109
Schlagwörter für diesen Artikel
biorefinery; cellulose degree of polymerization; delignification; ethanol; kinetics; organosolv pulping; sulfur dioxide

Artikel in diesem Heft

  1. Original Papers
  2. Effects of selected key chromophores on cellulose integrity upon bleaching 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  3. A novel, mild and selective methylation of carboxyl groups in cellulosic pulps 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  4. Effect of salts on the formation and properties of microcrystalline cellulose and chitosan gels 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  5. Detection of muconic acid type structures in oxidised lignins using 2D NMR spectroscopy 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  6. Synthesis of a lignin polymer model consisting of only phenolic β-O-4 linkages and testing its reactivity under alkaline conditions 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  7. HSQC-NMR analysis of lignin in woody (Eucalyptus globulus and Picea abies) and non-woody (Agave sisalana) ball-milled plant materials at the gel state 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  8. Syringyl-type simple plant phenolics as mediating oxidants in laccase catalyzed degradation of lignocellulosic materials: Model compound studies 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  9. Titration of free phenolic groups in pulps 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  10. Interfacial properties of polyelectrolyte complexes incorporating kraft lignin 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  11. Comparing soluble Trametes pubescens laccase and cross-linked enzyme crystals (CLECs) for enzymatic modification of cellulose 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  12. Exploring enzymatic treatments for the production of dissolving grade pulp from different wood and non-wood paper grade pulps 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  13. Effects of commercial cellobiohydrolase treatment on fiber strength and morphology of bleached hardwood pulp 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  14. Prehydrolysis of Eucalyptus globulus Labill. hemicelluloses prior to pulping and fermentation of the hydrolysates with the yeast Pichia stipitis 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  15. Activation of thermomechanical pulp by laccases as studied by UV-Vis, UV resonance Raman and FTIR spectroscopy 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  16. Biological control of sapstain fungi: From laboratory experiments to field trials 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  17. Study of the sorption-desorption properties of pine wood at the initial stage of decay by wood-rot fungi 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  18. Decay susceptibility of Amazon wood species from Brazil against white rot and brown rot decay fungi 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  19. Relations between chemical changes and mechanical properties of thermally treated wood 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  20. Kinetics of SO2-ethanol-water pulping of spruce 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  21. Study on desorption of Mn, Fe, and Mg from TMP and evaluation of the complexing strength of different chelating agents using side reaction coefficients 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  22. Short Note
  23. Determination of self-diffusion coefficient and hydrodynamic radius of xylan by NMR diffusometry (NMRd) 10th EWLP, Stockholm, Sweden, August 25–28, 2008
  24. Meetings
  25. Meetings
  26. Contents Volume 63
  27. Contents Volume 63 (2009)
  28. Subject index
  29. Subject index
  30. Species index (scientific names)
  31. Species index (scientific names)
  32. Author index
  33. Author index
  34. Acknowledgement
  35. Acknowledgement
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