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Effect of pulping and bleaching on pulp carbohydrates and technical properties.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
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1996 (English)In: Proceedings Int. Pulp Bleaching, 1996, 39-42 p.Conference paper (Refereed)
Abstract [en]

Pulping and bleaching have a profound effect on the carbohydrate chem. of kraft pulps.  The chem. structure of xylan is modified due to the conversion of methylglucuronic acid side groups to hexenuronic acid side groups.  Pulping conditions strongly affect the amt. of hexenuronic acid present in the pulp and subsequently modified kraft pulps have different carboxyl group profiles as compared with conventionally cooked pulps.  Due to its reactivity, hexenuronic acid is readily degraded when chlorine dioxide or ozone are used as bleaching chems.  However, TCF-pulps bleached with peroxide and oxygen contain high amts. of hexenuronic acid.  Thus, depending on the pulping and bleaching method, the quality and quantity of carboxylic acids in different types of pulps varies significantly.  The differences in the uronic acid content are in turn reflected in the macroscale properties of the pulps, such as brightness stability.       

Place, publisher, year, edition, pages
1996. 39-42 p.
National Category
Polymer Technologies Polymer Chemistry
URN: urn:nbn:se:kth:diva-79833OAI: diva2:497950
International Pulp Bleaching Conference, Washington, D. C., Apr. 14-18, 1996 (1996), 1, 39-42.
NR 20140805Available from: 2012-02-11 Created: 2012-02-09 Last updated: 2012-02-11Bibliographically approved

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Ek, Monica
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