Process for bleaching lignocellulose-containing pulps

Details Process for bleaching lignocellulose-containing pulps Process for bleaching lignocellulose-containing pulps

D - Textiles, Paper

21

C

8/78

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

Patent

CA 2017807

The invention relates to a process for bleaching chemically delignified lignocellulose-containing pulp, to render more efficient a peroxide-containing treatment stage, by treating the pulp with a complexing agent before the peroxide step, so that the trace metal profile of the pulp is altered by the treatment with the complexing agent, in the absence of sulphite, at a pH in the range from 3.1 up to 9.0 and at a temperature in the range from 10°C up to 100°C, whereupon, in a subsequent step, the treatment with a peroxide-containing substance is carried out at a pH in the range from 7 up to 13, said two-step treatment being carried out at an optional position in the-bleaching sequence applied to the pulp..

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