Process for bleaching of lignocellulose-containing pulp

Details Process for bleaching of lignocellulose-containing pulp Process for bleaching of lignocellulose-containing pulp

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21C 9/02 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2109179

Abstract The present invention relates to a process for bleaching of lignocellulose-containing pulp, in which the pulp is treat- ed at a pH between about 1 and about 7 in the presence of a magnesium compound, whereupon the pulp is washed and subse- quently bleached with a peroxide-containing compound. The ini- tial treatment removes from the pulp those trace metal ions that have a negative effect on the subsequent bleaching with a peroxide-containing compound. Owing to the presence of mag- nesium ions in dissolved form during the initial treatment, the magnesium ions are retained in those positions in the pulp where they have a particularly positive effect on the effec- tiveness of the bleaching stage.

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