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Improved lignin properties and reactivity by modifications in the autohydrolysis process of aspen wood
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.
2008 (English)In: Industrial crops and products (Print), ISSN 0926-6690, Vol. 27, no 2, 175-181 p.Article in journal (Refereed) Published
Abstract [en]

Autohydrolysis of aspen wood breaks down lignin beta-O-4 linkages via both acidolysis and homolytical cleavage. A simultaneous repolymerization by lignin-lignin condensation is the major reason for the low degree of delignification and the poor lignin reactivity. Modification of the autohydrolysis reaction by the addition of either NaOH or 2-naphthol changes the mechanism such that less acidolysis and fewer lignin-lignin condensation reactions take place, and an almost complete delignification can be achieved. The resulting isolated lignins have a low M., a light color and still contain some of the native beta-O-4 linkages. Lignin from autohydrolysis in the presence of NaOH possesses more carboxylic acid groups, while the addition of 2-naphthol results in a lignin with a large amount of phenolic hydroxyl groups and incorporated naphthalene rings. These types of change are beneficial since the lignin structure becomes much more homogeneous with a greater potential for further upgrading and use.

Place, publisher, year, edition, pages
2008. Vol. 27, no 2, 175-181 p.
Keyword [en]
aspen wood, autohydrolysis, lignin, structural analysis, reactivity, 2-naphthol, molecular-weight distribution, populus-tremuloides lignins, steam, explosion, auto-hydrolysis
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-17298DOI: 10.1016/j.indcrop.2007.07.022ISI: 000252909600007ScopusID: 2-s2.0-37349051629OAI: diva2:335341
Conference of the National-Institute-of-Drug-Abuse-Health-Disparities Location: Atlanta, GA Date: OCT 23-26, 2005 Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-08-23Bibliographically approved

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