Potential of hot water extraction of birch wood to produce high-purity dissolving pulp after alkaline pulping

Marc Borrega, Lasse K. Tolonen, Fanny Bardot, Lidia Testova, Herbert Sixta

Research output: Contribution to journalArticleScientificpeer-review

76 Citations (Scopus)

Abstract

The potential of hot water extraction of birch wood to produce highly purified dissolving pulp in a subsequent soda-anthraquinone pulping process was evaluated. After intermediate extraction intensities, pulps with low xylan content (3-5%) and high cellulose yield were successfully produced. Increasing extraction intensity further decreased the xylan content in pulp. However, below a xylan content of 3%, the cellulose yield dramatically decreased. This is believed to be due to cleavage of glycosidic bonds in cellulose during severe hot water extractions, followed by peeling reactions during alkaline pulping. Addition of sodium borohydride as well as increased anthraquinone concentration in the pulping liquor increased the cellulose yield, but had no clear effects on pulp purity and viscosity. The low intrinsic viscosity of pulps produced after severe extraction intensities and soda-anthraquinone pulping corresponded to the viscosity at the leveling-off degree of polymerization, suggesting that nearly all amorphous cellulose had been degraded.

Original languageEnglish
Pages (from-to)665-671
Number of pages7
JournalBioresource Technology
Volume135
DOIs
Publication statusPublished - May 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • Autohydrolysis
  • Cellulose
  • Dissolving pulp
  • Soda-AQ
  • Sodium borohydride

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