Conference proceedings article

Acid hydrogen peroxide treatment of Norway spruce TMP : The effect of chelated ferric ions

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Subtitle: The effect of chelated ferric ions

Author list: Engstrand, Per;Paulsson, Magnus

Publisher: Paper Engineers Association (PI)

Publication year: 2014

ISBN: 9780000000002


Abstract

The effect of treating thermomechanical pulp with Fenton chemistry was evaluated in a model study. Ferrous ions and chelated ferric ions were compared as catalysts while initial pH was varied. The results showed that a catalyst of ferrous sulphate had a greater impact on the pulp (increased total fibre charge and carbonyl groups, more dissolved organic material in filtrate) than ferric ions chelated with EDTA. If using ferric-EDG as catalyst, the hydrogen peroxide consumption was higher and more hydroxyl radicals were detected compared to if using ferrous sulphate. Ferric-EDG, however, gave similar or less effect on the pulp.


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