Process for delignifying and bleaching chemical pulp

Details Process for delignifying and bleaching chemical pulp Process for delignifying and bleaching chemical pulp

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/08 (2006.01) D21C 9/14 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2728349

The delignification and bleaching of chemical pulp by a bleaching stage, in which the chemical pulp is reacted first with chlorine dioxide and, after reaction of the chlorine dioxide, is further reacted without intermediate washing with hydrogen peroxide in the presence of a molybdate or tungstate, permits the production of chemical pulp having a whiteness of at least 89.5%, having improved stability to yellowing and reduced oxidative damage.

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