Bleaching of Pulps From the First Commercial Superbatch Cooking Plant, 1993 Pulping Conference Proceedings

Recent developments in extended cooking make it possible to produce fully bleached market pulp in ECF sequences with a very low consumption of chlorine dioxide.

Commercially produced softwood and hardwood SuperBatch pulps with kappa number 10-l1 were oxygen delignified to kappa number about 6, and bleached to 89% IS0 in the sequence D(EOP)D(EP)D with only about 15 kg active Cl/odt for

well-washed pulp. This bleaching effluent contains less than 0.2 kg AOX/odt.

By combining extended cooking with oxygen delignification, ozone and peroxide bleaching, fully bleached pulp can be produced in a short TCF sequence, OZQP. Oxygen delignified pulp with kappa number 6 can for example be bleached to 90% IS0 with 6 kg ozone/odt and 5-7 kg H2O2/odt.

Author: Norden, S., Boman, R.
Bleaching of Pulps From the First Commercial Superbatch Cook
Bleaching of Pulps From the First Commercial Superbatch Cooking Plant, 1993 Pulping Conference Proceedings
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