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Oxidative damage of pulp cellulose during different bleaching operations
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2006 (English)In: Research Progress in Pulping and Papermaking, 2006 / [ed] Beihai, H; Shiya, F; Fangeng, C, 2006, 315-320 p.Conference paper (Refereed)
Abstract [en]

An oxidative damage at pulp cellulose is not desirable but unavoidable during pulp bleaching. The oxidation at C-6 hydroxyl group results in a formation of C6-aldehyde and/or C6-carboxyl (glucuronic acid) structure. There is however not a simple and routine method available for quantification of the oxidised structures. In the present paper, methanolysis after a 72% sulphuric acid pre-solubilisation in combination of acetylation followed by GC-MS has been set up for quantification of the uronic acid structures in cellulose. Industrial birch and spruce kraft pulps were analysed after each oxidation operation in TCF and ECF bleaching sequence respectively. It was concluded that C6 carboxyl group exist in all the pulps tested. Oxygen delignification and (PO) stage generates more glucuronic acid structure in the softwood and the hardwood respectively. Galacturonic acid content was also increased during oxygen delignification of the spruce kraft pulp.

Place, publisher, year, edition, pages
2006. 315-320 p.
Keyword [en]
oxidative damage, Oxygen delignification, spuce kraft pulp, bleaching
National Category
Chemical Engineering
URN: urn:nbn:se:kth:diva-42245ISI: 000244038600062ISBN: 978-7-5623-2514-7OAI: diva2:446387
3rd International Symposium on Emerging Technologies of Pulping and Papermaking Location: Guangzhou, China, Date: NOV 08-10, 2006
QC 20111007Available from: 2011-10-07 Created: 2011-10-06 Last updated: 2011-10-07Bibliographically approved

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