Process for bleaching of lignocellulose-containing material

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

D - Textiles, Paper

21

C

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

Patent

CA 2067295

The present invention relates to a process for delig- nification and bleaching of chemically digested lignocel- lulose-containing pulp, where the pulp is treated with a complexing agent at a pH between 3.1 and 9.0, whereupon the pulp is bleached with ozone. The initial treatment with a complexing agent removes the ions of certain metals detri- mental to the subsequent ozone bleaching, while retaining in the pulp the desirable ions, primarily of alkaline earth metals. Thereby, the selectivity in the delignification is increased and the strength of the pulp maintained. The pulp can be bleached with peroxide before the ozone step and/or after the treatment according to the invention, to obtain the desired final brightness and completely avoid formation and discharge of chlorinated organic compounds.

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