Journal article

Acid Hydrogen Peroxide Treatment of Norway Spruce TMP : The Effect of an Extended pH Range when Catalyzed by Free Ferrous and Free or EDG/EDTA-Chelated Ferric Ions

Authors/Editors

No matching items found.



Research Areas

No matching items found.


Publication Details

Subtitle: The Effect of an Extended pH Range when Catalyzed by Free Ferrous and Free or EDG/EDTA-Chelated Ferric Ions

Author list: Engstrand, Per;Paulsson, Magnus;Walter, Karin

Publication year: 2014

Start page: 135

End page: 155

Number of pages: 21

ISSN: 0277-3813

DOI: http://dx.doi.org/10.1080/02773813.2013.844166

View additional information: View in Web of Science


Abstract

The influence of different types of iron salts (i.e., ferrous or ferric cations with sulphate, nitrate or chloride anions) on the reaction between coarse thermomechanical pulp and acid hydrogen peroxide (Fenton chemistry) was studied when the initial pH was 3.2 and 5.3. Also, ferric ions chelated with EDTA or EDG at different molar ratios were compared with ferrous sulphate when the initial pH was extended from about 3 to 8. Different anions of ferric ion salt gave a similar catalytic effect. At an initial pH of 7–8, the ferric-EDTA catalyzed reaction resulted in similar or higher hydrogen peroxide consumption and more detectable hydroxyl radicals than the ferrous sulphate catalyzed reaction, but less reaction with the pulp was indicated. Between pH 5–8, using Fe-EDG as a catalyst gave higher hydrogen peroxide consumption and more detectable hydroxyl radicals than if using ferrous sulphate; however, the measured effect on the pulp was similar or less.


Projects

No matching items found.


Keywords

No matching items found.


Documents

No matching items found.