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The possibility of controlling formation and cleavage reactions of HexA during kraft pulping
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.ORCID iD: 0000-0002-2900-4713
2006 (English)In: 2006 TAPPI Engineering, Pulping and Environmental Conference Proceedings, 2006Conference paper, Published paper (Refereed)
Abstract [en]

During kraft pulping, the side groups in the xylan backbone, 4-O-methyl-D-glucuronic acid (MeGlcA), are partly converted to hexenuronic acid (HexA). Simultaneously, degradation reactions of these side groups take place. In this study, the activation energies (Ea) for these reactions were determined during kraft pulping of birch from constant composition cook. The results show that Ea of bulk delignification (118kJ/mol, in accordance with earlier studies) is similar to that of HexA formation (129kJ/mol) and MeGlcA degradation (120kJ/mol), but it is lower than that of HexA degradation (141kJ/mol). The differences in activation energies imply a possibility of controlling the HexA and MeGlcA content in xylan by cooking temperature. This study demonstrated that this is indeed the case for the dissolved xylan, whereas pulp xylan is not markedly affected by a change in cooking temperature.

Place, publisher, year, edition, pages
2006.
Series
2006 TAPPI Engineering, Pulping and Environmental Conference Proceedings, 2006
Keyword [en]
Composition cook, Cooking temperature, Hexenuronic acid degradation, Xylan backbone, Activation energy, Carboxylic acids, Degradation, Polysaccharides, Kraft pulp, Chemical Pulping, Digestion, Glucuronic Acid, Hexenuronic Acid, Kraft Pulping, Xylans
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-155839Scopus ID: 2-s2.0-33847396890OAI: oai:DiVA.org:kth-155839DiVA: diva2:769958
Conference
2006 TAPPI Engineering, Pulping and Environmental Conference, 5 November 2006 through 8 November 2006, Atlanta, GA
Note

QC 20141209

Available from: 2014-12-09 Created: 2014-11-13 Last updated: 2014-12-09Bibliographically approved

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Lindstrom, Mikael

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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Language
  • de-DE
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