Impact of hemicellulose pre-extraction for bioconversion on birch Kraft pulp properties

Jonas Helmerius, Jonas Vinblad von Walter, Ulrika Rova, Kris A. Berglund, David B. Hodge

Research output: Contribution to journalArticle

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Abstract

The combination of hemicellulose extraction with chemical pulping processes is one approach to generate a sugar feedstock amenable to biochemical transformation to fuels and chemicals. Extractions of hemicellulose from silver birch (Betula pendula) wood chips using either water or Kraft white liquor (NaOH, Na2S, and Na2CO3) were performed under conditions compatible with Kraft pulping, using times ranging between 20 and 90 min, temperatures of 130-160 °C, and effective alkali (EA) charges of 0-7%. The chips from select extractions were subjected to subsequent Kraft pulping and the refined pulps were made into handsheets. Several metrics for handsheet strength properties were compared with a reference pulp made without an extraction step. This study demonstrated that white liquor can be utilized to extract xylan from birch wood chips prior to Kraft cooking without decreasing the pulp yield and paper strength properties, while simultaneously impregnating cooking alkali into the wood chips. However, for the alkaline conditions tested extractions above pH 10 resulted in low concentrations of xylan. Water extractions resulted in the highest final concentrations of xylan; yielding a liquor without the presence of toxic or inhibitory inorganics and minimal soluble aromatics that we demonstrate can be successfully enzymatically hydrolyzed to monomeric xylose and fermented to succinic acid. However, water extractions were found to negatively impact some pulp properties including decreases in compression strength, bursting strength, tensile strength, and tensile stiffness while exhibiting minimal impact on elongation and slight improvement in tearing strength index.

Original languageEnglish (US)
Pages (from-to)5996-6005
Number of pages10
JournalBioresource Technology
Volume101
Issue number15
DOIs
StatePublished - Aug 2010

Profile

Pulp
Water
Calcaneus
water
Kraft process
Marsupialia
Pulp cooking
Bioconversion
Xylose
Kraft pulp
Cooking
Sugars
Feedstocks
Elongation
Silver
Compaction
Tensile strength
Stiffness
Acids
Temperature

Keywords

  • Forest biorefinery
  • Hardwood
  • Hemicellulose extraction
  • Kraft pulping
  • Xylan

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

Cite this

Impact of hemicellulose pre-extraction for bioconversion on birch Kraft pulp properties. / Helmerius, Jonas; von Walter, Jonas Vinblad; Rova, Ulrika; Berglund, Kris A.; Hodge, David B.

In: Bioresource Technology, Vol. 101, No. 15, 08.2010, p. 5996-6005.

Research output: Contribution to journalArticle

Helmerius, Jonas; von Walter, Jonas Vinblad; Rova, Ulrika; Berglund, Kris A.; Hodge, David B. / Impact of hemicellulose pre-extraction for bioconversion on birch Kraft pulp properties.

In: Bioresource Technology, Vol. 101, No. 15, 08.2010, p. 5996-6005.

Research output: Contribution to journalArticle

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