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Significance of xylan and glucomannan in the brightness reversion of kraft pulps
Vise andre og tillknytning
1997 (engelsk)Inngår i: TAPPI Journal, ISSN 0734-1415, Vol. 80, nr 6, s. 165-171Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The brightness reversion of kraft pulps is caused by the presence of residual lignin, chlorinated extractives, or oxidized carbohydrates. The effect of hemicellulose content, i.e., xylan (I) and glucomannan (II), on the thermal stability of modern bleached kraft pulps was investigated. Different O-delignified hard- and softwood kraft pulps were bleached with different bleaching sequences contg. ClO2, H2O2, or O3. Hemicellulose-degrading enzymes, i.e., xylanase or mannanase, were used for selective removal of the resp. hemicellulose from the pulps, and the role of partially removed I and II on the brightness stability of these pulps was studied. Because of the structure of kraft I, enzymic removal of I also resulted in a decreased carboxyl group content in the pulps, whereas II removal did not affect the carboxyl group content. By decreasing the carboxyl groups in the pulps in conjunction with I removal, the thermal aging of the pulps was significantly decreased. The role of II was less significant. Thus, the uronic acids present in the pulp participate in the brightness reversion of kraft pulps.

sted, utgiver, år, opplag, sider
1997. Vol. 80, nr 6, s. 165-171
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-80524OAI: oai:DiVA.org:kth-80524DiVA, id: diva2:498106
Merknad
NR 20140805Tilgjengelig fra: 2012-02-11 Laget: 2012-02-09 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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