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Organic materials in black liquors of soda-AQ pulping of hot-water-extracted birch (Betula pendula) sawdust

  • Joni Lehto EMAIL logo and Raimo Alén
Published/Copyright: September 18, 2014
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Abstract

The chemical composition of black liquors obtained from the soda-AQ pulping of birch (Betula pendula) sawdust was studied as a function of cooking time, effective alkali content, and hot-water pretreatment of the sawdust prior to delignification. Special attention was paid on the formation of lignin-derived materials and low-molecular-mass carbohydrate-derived degradation products containing aliphatic carboxylic acids. In the case of the hot-water-pretreated feedstock, less acetic acid and formic acid and more nonvolatile hydroxy acids (especially monocarboxylic acids) were obtained. The observations can be interpreted as a result of the extensive removal of hemicelluloses during the hot-water pretreatment.


Corresponding author: Joni Lehto, Laboratory of Applied Chemistry, Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland, e-mail:

Acknowledgments

Financial support within the framework of the FuBio JR2 Research Program (Finnish Bioeconomy Cluster, FIBIC) is gratefully acknowledged. Olli Byman and Petri Kilpeläinen from the Finnish Forest Research Institute (Metla) are gratefully acknowledged for providing necessary feedstock materials for the cooking experiments. Special thanks are due to Mrs. Marja Salo, Mr. Jukka Pekka Isoaho, Mr. Hannu Salo, and Mr. Hannu Pakkanen for their versatile help during the experimental work.

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Received: 2014-3-27
Accepted: 2014-8-15
Published Online: 2014-9-18
Published in Print: 2015-4-1

©2015 by De Gruyter

Articles in the same Issue

  1. Frontmatter
  2. Original Articles
  3. Characterization of dissolved lignins from acetic acid Lignofibre (LGF) organosolv pulping and discussion of its delignification mechanisms
  4. Organic materials in black liquors of soda-AQ pulping of hot-water-extracted birch (Betula pendula) sawdust
  5. Effects of concentration and temperature on the rheological behavior of concentrated sodium lignosulfonate (NaLS) solutions
  6. Raman microscopic analysis of wood after treatment with the ionic liquid, 1-ethyl-3-methylimidazolium chloride
  7. Isolation and structural elucidation of norlignan polymers from the heartwood of Cryptomeria japonica
  8. Effect of ball milling on lignin polyesterification with ε-caprolactone
  9. Property enhancement of kenaf fiber composites by means of vacuum-assisted resin transfer molding (VARTM)
  10. Wood polypropylene composites prepared by thermally modified fibers at two extrusion speeds: mechanical and viscoelastic properties
  11. Numerical analysis of temperature profiles during thermal modification of wood: chemical reactions and experimental verification
  12. Fast online NIR technique to predict MOE and moisture content of sawn lumber
  13. Numerical study of the influence of veneer lathe checks on the elastic mechanical properties of laminated veneer lumber (LVL) made of beech
  14. Amination of pretreated ayous (Triplochiton scleroxylon) sawdust with two organosilanes: characterization, stability, and permselective property
  15. Damage evolution in wood – pattern recognition based on acoustic emission (AE) frequency spectra
  16. Mechanical stability of superhydrophobic epoxy/silica coating for better water resistance of wood
  17. Short Note
  18. Urea-formaldehyde resin penetration into Pinus radiata tracheid walls assessed by TEM-EDXS
  19. Obituary
  20. Professor Dr. Arnis Treimanis
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