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Licensed Unlicensed Requires Authentication Published by De Gruyter February 24, 2016

Reactions between peracetic acid and lipophilic extractives – methodologies and implications in post bleaching of kraft pulps

  • Jan-Erik Raitanen , Anna Sundberg EMAIL logo , Jonas Konn , Annika Smeds and Stefan Willför
From the journal Holzforschung


Pulp mills constantly look for opportunities to increase their production capacity without major investments, as well as to save in overall bleaching costs. Peracetic acid (PAA) is used in post bleaching of kraft pulps to increase pulp brightness, to prevent brightness reversion in pulp storage, and to prohibit problems caused by extractives. However, the rates and significance of reactions between PAA and lipophilic extractives in pulp bleaching are not known in detail. Hence, the reactions between PAA and model compounds of extractives have been studied as emulsions in water and directly in methyl-tert-butyl ether (MTBE). Unsaturated compounds were found to be reactive in both water and MTBE, and the conventional extractive analyses had to be modified. Freeze-drying the reaction mixture with subsequent trimethylsilylation and GC-analysis was a very effective analytical approach. As a result of PAA treatment, fatty acids and sterols with double bonds were shown to form epoxides and the corresponding diols. Dehydroabietic acid (DeAb) also reacted with PAA by oxidation of the benzylic position. After longer reaction times, the reaction products of the extractives were further degraded or formed cross-linked aggregates. The epoxides and diols were also identified in samples from pulp mills applying PAA in post bleaching.

Corresponding author: Anna Sundberg, Åbo Akademi University, Johan Gadolin Process Chemistry Centre c/o Laboratory of Wood and Paper Chemistry, Porthansgatan 3–5, FI-20500 Turku/Åbo, Finland, e-mail:


This work was part of the activities of the Johan Gadolin Process Chemistry Centre at Åbo Akademi University. Financial support from Kemira Oyj is gratefully acknowledged.


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Received: 2015-10-12
Accepted: 2016-1-18
Published Online: 2016-2-24
Published in Print: 2016-8-1

©2016 Walter de Gruyter GmbH, Berlin/Boston

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