Bleaching of chemical pulp

Details Bleaching of chemical pulp Bleaching of chemical pulp

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2124088

2124088 9314262 PCTABS00024 A method of bleaching sulphate pulp without using chlorine-containing bleaching agents. The sulphate pulp is oxygen delignified and can possibly also be ozone delignified to a kappa number below 9.5. Thereafter a pretreatment with complexing agent is carried out for 1-60 minutes, at which the pulp consistency is 1-15 %, the temperature 70-110 ·C and pH 5-7. The pulp thus pretreated is washed and dewatered to a consistency of 18-40 %. Thereafter peroxide bleaching in alkaline environment takes place in the presence of silicate or an organic complexing agent of the type phosphonic or carboxylic acid.

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