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A precise study on effects that trigger alkaline hemicellulose extraction efficiency.

Christian Hutterer1, Gabriele Schild2, Antje Potthast3

  • 1Kompetenzzentrum Holz GmbH, Altenberger Str. 69, A-4040 Linz, Austria.

Bioresource Technology
|May 11, 2016
PubMed
Summary

Efficiently removing hemicelluloses from paper-grade pulps is key for dissolving pulp production. Alkaline extraction conditions, specifically temperature and alkalinity, significantly impact hemicellulose removal efficiency in beech, birch, and eucalyptus pulps.

Keywords:
Alkaline degradationCold caustic extractionMolar massSugar compositionXylan product

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Area of Science:

  • Pulp and Paper Chemistry
  • Biomass Processing
  • Macromolecular Science

Background:

  • Dissolving pulp production necessitates the removal of hemicelluloses from paper-grade pulps.
  • Current methods include alkaline extraction and enzymatic treatments.
  • Hardwood xylans hold potential for food and pharmaceutical applications.

Purpose of the Study:

  • To evaluate the extraction efficiencies of hemicelluloses from three hardwood species (beech, birch, eucalyptus) using alkaline treatments.
  • To analyze the impact of process variables on hemicellulose extraction and molar mass distribution.
  • To assess the potential of extracted hardwood xylans.

Main Methods:

  • Alkaline extraction of beech, birch, and eucalyptus pulps using white liquor.
  • Varying treatment temperatures and alkalinities.
  • Analysis of pulp and extraction lye composition, including hemicellulose content and molar mass distribution.

Main Results:

  • Extraction efficiency and hemicellulose molar mass distribution were strongly dependent on temperature and effective alkalinity.
  • Hemicellulose content of initial pulps, hardwood species, and base type played minor roles in extraction efficiency.
  • Extracted hardwood xylans show promise for industrial applications.

Conclusions:

  • Optimizing temperature and alkalinity in alkaline extraction is crucial for efficient hemicellulose removal.
  • Process conditions are more influential than substrate characteristics for hemicellulose extraction.
  • Hardwood xylans are valuable co-products with potential in food and pharmaceutical sectors.