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Polysulphide pretreatment of softwood for increased delignification and higher pulp viscosity
KTH, Superseded Departments, Pulp and Paper Technology.
KTH, Superseded Departments, Pulp and Paper Technology.
KTH, Superseded Departments, Pulp and Paper Technology.
2004 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 30, no 5, 129-135 p.Article in journal (Refereed) Published
Abstract [en]

The effect of polysulphide pretreatment under various conditions prior to a kraft cook was investigated for spruce (Picea abies) chips using a technique with a liquor:wood ratio of 67:1 to keep the liquor composition as constant as possible during the pretreatment and cooking phases. If the polysulphidepretreatment is carried out at a very high hydroxide concentration, 1.5 mol OH-/L, three independent positive effects (compared with a corresponding sulphide pretreatment without polysulphide) can be observed: more extensive delignification; higher pulp, viscosity; and higher carbohydrate yield. When the alkali change was changed in the subsequent kraft cook (in the range 0.15-0.60 mol/L), the increase in delignification extent as a result of polysulphide pretreatment was not affected but the relative carbohydrate yield increase was favoured by a higher alkali charge during cooking. On the other hand, the absolute carbohydrate yield is favoured by a intermediate alkali charge.

Place, publisher, year, edition, pages
2004. Vol. 30, no 5, 129-135 p.
Keyword [en]
pretreatment, chips, picea abies, kraft pulping, polysulfides, liquor ratio, hydroxides, concentration, alkali consumption, delignification, viscosity, carbohydrates, yield
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Other Chemistry Topics
Identifiers
URN: urn:nbn:se:kth:diva-23530ISI: 000222250700003Scopus ID: 2-s2.0-2442530323OAI: oai:DiVA.org:kth-23530DiVA: diva2:342228
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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