Influence of the alkalinity in polysulphide pretreatment on results of cooking with normal liquor-to-wood ratios
2004 (English)In: Paperi ja puu, ISSN 0031-1243, Vol. 86, no 3, 169-173 p.Article in journal (Refereed) Published
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.
kraft, polysulfide, pretreatment, alkalinity, delignification, viscosity, yield
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-47389ISI: 000221006000013ScopusID: 2-s2.0-2442615147OAI: oai:DiVA.org:kth-47389DiVA: diva2:455201
QC 201111092011-11-092011-11-082011-11-09Bibliographically approved