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Investigation of the carbonate radical as a bleaching reagent in pulp: The quest for eco-efficient delignification
KTH, Superseded Departments, Chemistry.
2003 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2003. , 43 p.
Series
Trita-KKE, ISSN 0349-6465 ; 0303
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-1626OAI: oai:DiVA.org:kth-1626DiVA: diva2:7555
Note
QC 20100812Available from: 2003-09-10 Created: 2003-09-10 Last updated: 2010-08-12Bibliographically approved
List of papers
1. Reactivity of the carbonate radical anion towards carbohydrate and lignin model compounds
Open this publication in new window or tab >>Reactivity of the carbonate radical anion towards carbohydrate and lignin model compounds
2003 (English)In: Journal of wood chemistry and technology, ISSN 0277-3813, E-ISSN 1532-2319, Vol. 23, no 1, 47-69 p.Article in journal (Refereed) Published
Abstract [en]

The kinetic selectivity for the reaction of the carbonate radical anion towards lignin and carbohydrate model compounds was determined by pulse radiolysis in the pH-span 8-13. For the cellulose model compound methyl-β-D-glucopyranoside a pKA-value of 14.4 was estimated.

Keyword
Bleaching, Carbonate radical anion, Pulp, Selectivity, electron reduction potentials; phenoxyl radicals; rate constants; peroxynitrite; cations; dioxide; water; chemistry; acidity; damage
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-5265 (URN)10.1081/WCT-120018615 (DOI)
Note
QC 20100812Available from: 2005-06-02 Created: 2005-06-02 Last updated: 2017-12-04Bibliographically approved
2. Peroxynitrite mediated delignification of pulp: A comparative study on the bleaching properties of the carbonate and hydroxyl radicals
Open this publication in new window or tab >>Peroxynitrite mediated delignification of pulp: A comparative study on the bleaching properties of the carbonate and hydroxyl radicals
2004 (English)In: Journal of wood chemistry and technology, ISSN 0277-3813, E-ISSN 1532-2319, Vol. 24, no 2, 83-98 p.Article in journal (Refereed) Published
Abstract [en]

Oxygen delignified pulps were bleached with hydroxyl and carbonate radicals produced from peroxynitrite. The carbonate radical treated pulps showed better selectivity and an increase in brightness. For both radicals, good kappa reductions were obtained. This study shows that the carbonate radical anion is a possible green oxidant for future delignification technologies.

Keyword
Delignification, Hydroxyl and carbonate radicals, Kappa, viscosity, and brightness values, Peroxynitrite
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-5270 (URN)10.1081/WCT-200026553 (DOI)000223809300001 ()2-s2.0-4544345768 (Scopus ID)
Note
QC 20100812Available from: 2005-06-02 Created: 2005-06-02 Last updated: 2017-12-04Bibliographically approved

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