Features of the Bleached Sulfate Hardwood Pulp Production When Using the Birch and Aspen Wood Resources in the Ratio of Seventy-to-Thirty

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UDС

676.017

DOI:

10.17238/issn0536-1036.2015.5.174

Abstract

Birch and aspen are the main species of deciduous wood raw materials for the pulp and paper mills of Russia. These wood species have differences in density and in the fiber mor-phology. These facts have a significant impact on the technology of pulp production and its properties. The previous studies have shown an economic effect in the increasing of the birchwood content in the composition of hardwood raw material only up to 70 %. Further increase leads to an unjustified increase of production costs of bleached pulp because of the increased bleaching requirement. However, the consumption of bleaching reagents depends not only on the species of wood, but also on the reactivity of the pulp components, primarily of lignin as the lignin reactivity is largely dependent on the pulping conditions. This paper presents the research results of the effect of the hardwood cooking conditions on the pulp bleachability. The content of birchwood in the raw material was 70 %. The pulp ability to be bleached (bleachability) is usually assessed by the chlorine dioxide consumption per 1 kappa unit. Under laboratory conditions the wood cooking was conducted. The kappa number of the obtained pulp samples was of 17...18 units. It has been established that a positive influence on the pulp bleachability, obtained from the raw material of that kind, has increased the concentration of active alkali up to 60 g/l, which corresponds to an active alkali consumption of 18 % per a Na2O unit, and the reduction of duration at the final temperature up to 40 min at 156 ?C cooking temperature. The two-stage oxygen-alkaline treatment can further improve the bleachability of sulfate hardwood pulp.

Authors

L.A. Milovidova1, Candidate of Engineering, Senior Research Scientist 

Affiliation

1Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia; е-mail: lmilovidova@mail.ru2BKT Service LLC, Mozhayskaya st., 18, bl.A, office 6H, Saint Petersburg, 190013, Russia; е-mail: maxim.romanov@bktservice.ru

Keywords

hardwood pulp, birchwood and aspenwood, pulping conditions, pulp bleachabil-ity, oxygen-alkaline pulp treatment.

References

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