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On chromophores and leucochromophores formed during the refining of wood
KTH, Superseded Departments, Pulp and Paper Technology.
KTH, Superseded Departments, Pulp and Paper Technology.
2002 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 17, no 1, 5-+ p.Article in journal (Refereed) Published
Abstract [en]

The discoloration reactions taking place when wood is converted to thermomechanical pulp (TMP) were studied using milled wood lignin (MWL), from spruce wood chips and from first-stage refined pulp respectively. As analytical tools, advanced NMR techniques and UV-VIS spectroscopy were used, to detect differences in the chemical composition. It was found that the most probable reason for the discoloration reactions is an oxidation of lignin, giving rise to small amounts of aryl-alpha-carbonyl structures, together with the formation of coloured metal ion complexes. Despite the results from earlier works, on beta-1 and beta-5 lignin model compounds, no stilbenes seemed to be formed during refining.

Place, publisher, year, edition, pages
2002. Vol. 17, no 1, 5-+ p.
Keyword [en]
chromophores, milled wood lignin (MWL), nuclear magnetic resonance (NMR), stilbenes, thermomechanical pulp (TMP), lignin model compounds, mechanochemical reactions
URN: urn:nbn:se:kth:diva-21428ISI: 000174750900001OAI: diva2:340126
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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