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Use of chlorine dioxide and ozone in combination in prebleaching
KTH, Superseded Departments, Pulp and Paper Technology.
2002 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 28, no 9, 305-310 p.Article in journal (Refereed) Published
Abstract [en]

(DZ)Eo prebleaching of oxygen-delignified softwood kraft pulp gave a synergistic delignification effect compared to the effect of chlorine dioxide and ozone Separately, and the (DZ)Eo process was somewhat better than (ZD)Eo prebleaching in terms of delignification. The solubilization of the lignin in chlorine dioxide and ozone bleaching seems to be governed by the large number of carboxyl groups introduced into the lignin structure. The efficient delignification obtained in (DZ)Eo prebleaching may be explained by the ability of chlorine dioxide and ozone to degrade different Apes of lignin structures. Whereas chlorine dioxide mainly degrades phenolic lignin structures, ozone is capable of degrading both phenolic and non-phenolic lignin structures. The (DZ) treatment initially allows chlorine dioxide to degrade the phenolic lignin structures, and leaves the non-phenolic and less reactive lignin structures for the ozone treatment.

Place, publisher, year, edition, pages
2002. Vol. 28, no 9, 305-310 p.
Keyword [en]
pretreatment, kraft pulps, softwood pulps, oxygen, delignification, bleached pulps, chlorine dioxide, ozone, performance evaluation, phenolic hydroxyl-groups, hexeneuronic acid groups, residual lignin, bleaching sequence, structural-changes, kraft cooking, wood, pulp
URN: urn:nbn:se:kth:diva-21968ISI: 000178597800004OAI: diva2:340666
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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