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Chromophoric content in wood and mechanical pulps
KTH, Superseded Departments, Pulp and Paper Technology.
2000 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 15, no 4, 282-286 p.Article in journal (Refereed) Published
Abstract [en]

The contents of chromophoric and leuchochromophoric structures in wood material and how the contents of these structures change through the TMP process, have been investigated. As an analytical tool, light absorption spectra of wood and pulps in the region from 300-700 nm have been recorded. The spectra were obtained from reflectance measurements and subsequent calculations using the Kubelka-Munk theory. The greatest chemical changes in the wood material seem to occur already during the first refining stage. The light absorption increases significantly in the UV-region, indicating the formation of e.g. aromatic alpha -carbonyl and/or conjugated aromatic structures. The formation of this kind of structures can be reduced by treating the wood chips with DTPA and sodium sulphite before refining.

Place, publisher, year, edition, pages
2000. Vol. 15, no 4, 282-286 p.
Keyword [en]
chromophores, Kubellca-Munk theory, leuchochromophores, thermo-mechanical pulp (TMP), mechanochemical reactions, lignin
Identifiers
URN: urn:nbn:se:kth:diva-20244ISI: 000166019400004OAI: oai:DiVA.org:kth-20244DiVA: diva2:338937
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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