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Removal of non-process elements from hardwood chips prior to kraft cooking
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
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2006 (English)In: Appita journal, ISSN 1038-6807, Vol. 59, no 6, 493-499 p.Article in journal (Refereed) Published
Abstract [en]

The major part of the intake of non-process elements (NPEs) to the pulp mill is via the wood chips. Some of the problems associated with NPEs are for example, precipitation of sparingly soluble calcium salts in the fibre line and in the recovery department. In order to investigate the possibilities of reducing the intake of NPEs via hardwood chips to the pulp mill, laboratory studies on the acidic leaching of birch and eucalypt chips were carried out. The results showed that potassium, magnesium and manganese were removed from both wood species at similar rates. The removal of calcium was however significantly slower from eucalypt than from birch. Removal of NPEs from birch wood chips prior to cooking resulted in a higher rate of delignification, a higher unbleached brightness and a higher viscosity. In the case of eucalypt, acidic leaching had no effect on the rate of delignification. The positive effect of acidic leaching of birch chips was found to be due to a lower content of calcium in the cooking stage.

Place, publisher, year, edition, pages
2006. Vol. 59, no 6, 493-499 p.
Keyword [en]
hardwood chips, acidic leaching, metals, calcium, kraft cooking, rate of delignification, metal-ions, pulp fibers, lignin, delignification, cations, wood, precipitation, behavior, complex, model
URN: urn:nbn:se:kth:diva-16113ISI: 000241821400012ScopusID: 2-s2.0-33751043567OAI: diva2:334155
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Gellerstedt, Göran
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