Improved lignin properties and reactivity by modifications in the autohydrolysis process of aspen wood
2008 (English)In: Industrial crops and products (Print), ISSN 0926-6690, Vol. 27, no 2, 175-181 p.Article in journal (Refereed) Published
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.
aspen wood, autohydrolysis, lignin, structural analysis, reactivity, 2-naphthol, molecular-weight distribution, populus-tremuloides lignins, steam, explosion, auto-hydrolysis
IdentifiersURN: urn:nbn:se:kth:diva-17298DOI: 10.1016/j.indcrop.2007.07.022ISI: 000252909600007ScopusID: 2-s2.0-37349051629OAI: oai:DiVA.org:kth-17298DiVA: diva2:335341
Conference of the National-Institute-of-Drug-Abuse-Health-Disparities Location: Atlanta, GA Date: OCT 23-26, 2005 2010-08-052010-08-052011-08-23Bibliographically approved