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Some factors affecting the brightness and TCF-bleachability of kraft pulp
KTH, Superseded Departments, Pulp and Paper Technology.
2003 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 18, no 1, 56-62 p.Article in journal (Refereed) Published
Abstract [en]

By varying the cooking conditions, several series of kraft pulps having different brightness levels, i.e. different light absorption coefficients (k), were prepared. A clear correlation between the residual alkali concentration in the black liquor and the k-value was found. The darkening of the pulp (increasing k) was shown to be, in part, due to a higher content of calcium ions that increased lignin redeposition onto the fibers during the cook. Moreover, the production of a bright unbleached pulp (with low k-value) appeared to be beneficial for subsequent TCF-bleaching with hydrogen peroxide.

Place, publisher, year, edition, pages
2003. Vol. 18, no 1, 56-62 p.
Keyword [en]
beta-aryl ether structures, bleachability, hexenuronic acid, hydrogen peroxide, light absorption coefficient, kraft pulp, oxygen, residual lignin, hexeneuronic acid groups, kappa-number, alkaline media, metal-cations, spruce wood, lignin, condensation, precipitation, cooking
URN: urn:nbn:se:kth:diva-22439ISI: 000182384600009OAI: diva2:341137
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Gellerstedt, Göran
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