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Influence of the alkalinity in polysulphide pretreatment on results of cooking with normal liquor-to-wood ratios
KTH, Superseded Departments, Pulp and Paper Technology.
KTH, Superseded Departments, Pulp and Paper Technology.
KTH, Superseded Departments, Pulp and Paper Technology.
2004 (English)In: Paperi ja puu, ISSN 0031-1243, Vol. 86, no 3, 169-173 p.Article in journal (Refereed) Published
Abstract [en]

The effect of alkalinity in a polysulphide pretreatment on the delignification rate, pulp yield and the pulp viscosity in the following kraft cook was investigated. The results were compared to those with reference pretreatments with a corresponding concentrations of hydroxide and hydrogen sulphide ions. The experiments were carried out at liquor-to-wood ratio of 4:1, and the alkalinity in the pretreatments was varied from 0 to 2.5 mole hydroxide/litre. It was found that when the polysulphide preteatment is performed at very high initial hydroxide concentrations, > 1.5 mole/litre, the delignification rate in the cook is increased. The pulp viscosity was higher than that achieved with the sulphide reference when the pulping was extended to low kappa numbers and when the initial hydroxide ion concentration in the pretreatment was high.

Place, publisher, year, edition, pages
2004. Vol. 86, no 3, 169-173 p.
Keyword [en]
kraft, polysulfide, pretreatment, alkalinity, delignification, viscosity, yield
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-47389ISI: 000221006000013Scopus ID: 2-s2.0-2442615147OAI: oai:DiVA.org:kth-47389DiVA: diva2:455201
Note

QC 20111109

Available from: 2011-11-09 Created: 2011-11-08 Last updated: 2017-12-08Bibliographically approved

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