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Summary
The oxidation of pine kraft lignin by alkaline hydrogen peroxide and cyanamide activated hydrogen peroxide was studied. Over 70% of the kraft lignin was degraded and solublized in the presence of cyanamide as compared to less than 20% by hydrogen peroxide alone. A large decrease in the phenolic hydroxyl and methoxyl content,as well as an increase in the carboxylic acid content was also observed in the insoluble residue. Analyses of the low molecular weight degradation products revealed extensive oxidation of the kraft lignin had occurred,consistent with the ring-opening reactions observed in our previous studies using lignin model compounds.
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Published Online: 2005-06-01
Published in Print: 2002-02-06
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
