Some factors affecting the brightness and TCF-bleachability of kraft pulp
2003 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 18, no 1, 56-62 p.Article in journal (Refereed) Published
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.
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
IdentifiersURN: urn:nbn:se:kth:diva-22439ISI: 000182384600009OAI: oai:DiVA.org:kth-22439DiVA: diva2:341137
QC 201005252010-08-102010-08-10Bibliographically approved