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Optimering av blekeriet i CTMP-linjen vid Rottneros Bruk
Karlstad University, Division for Chemistry.
2006 (Swedish)Independent thesis Basic level (professional degree), 20 points / 30 hpStudent thesis
Abstract [en]

At Rottneros pulp mill mechanical pulp is bleached with hydrogen peroxide. The changes of bleaching chemicals that are used for different grades are taken from bleaching tables; however these tables are old and need to be updated. The purpose of this thesis was to be the basis of new documentation.

In this thesis three pulps where studied with the aim to find the optimal bleaching chemical changes (total NaOH/VP-quote) for each pulp. The pulps were taken from the filter before the bleaching tower and the pulps were bleached in the lab. The most important pulp property in this study was the brightness and how that was influenced by the chemical dosages. A fiberline inspection was also done to examine the brightness gain during the process. Finally a study was carried out to examine how freeness affected the brightness for low- and high freeness pulps.

The studies showed that reduced chemical consumption was possible to achieve for all pulps studied. For pulp CA 683 a total NaOH/VP-ratio of 0,8 was suggested, while the ratio were 1,1 for CA 970 and 0,7 for CS 770.

Lower freeness increased the brightening of the pulp at the same chemical consumption.

Place, publisher, year, edition, pages
2006. , p. 51
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-438OAI: oai:DiVA.org:kau-438DiVA, id: diva2:6094
Presentation
2006-10-17
Uppsok
teknik
Supervisors
Examiners
Available from: 2006-10-24 Created: 2006-10-24

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CiteExportLink to record
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Citation style
  • apa
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