D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/14 (2006.01) D21C 9/10 (2006.01)
Patent
CA 2264423
The present invention relates to a method for treatment of pulp in an alkaline pulping process of chemical pulp. The pulp is treated in a chlorine dioxide stage comprising successive preferably a chlorine dioxide step and an acid treatment step at a pH of 2 - 5 and a temperature of over 80°C. The conditions in the chlorine dioxide step are such that the hexenuronic acid groups in the pulp do not react with chlorine dioxide.
Juutilainen Sari
Vilpponen Aki
Vuorinen Tapani
Ahlstrom Machinery Oy
Andritz Oy
Gowling Lafleur Henderson Llp
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