On the role of carbohydrates in oxygen delignification
2005 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 20, no 4, 448-452 p.Article in journal (Refereed) Published
The decrease in efficiency of the oxygen delignification of chemical pulps at low kappa numbers has been investigated. In order to study the role of the carbohydrates, five different fully bleached pulps were oxygen delignified and carefully analysed. The results show that no permanganate-consuming structures were formed in the carbohydrates during oxygen delignification, but that small amounts of lignin are slowly degraded. Unexpectedly, the ISO brightness was significantly increased, while the yellowing tendency was reduced, in some cases dramatically, making a final oxygen delignification treatment after a bleaching sequence an interesting option for market pulp producers with yellowing problems.
Place, publisher, year, edition, pages
2005. Vol. 20, no 4, 448-452 p.
oxygen delignification, carbohydrates, cellulose, hemicellulose, xylan, glucomannan, kappa number, holocellulose, bleached kraft pulp, cotton linters, brightness, yellowing tendency, softwood kraft pulp, residual lignin, chemical pulps, kappa number, cooking, removal, alkali, bonds
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-15321ISI: 000235258200012ScopusID: 2-s2.0-30344433761OAI: oai:DiVA.org:kth-15321DiVA: diva2:333362
QC 20100525 QC 201112052010-08-052010-08-052012-05-07Bibliographically approved