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

9/36

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

Patent

CA 2040871

The present invention relates to a process for delig- nification and bleaching of chemically digested lignocellu- lose-containing pulp for reduced formation and discharge of halogenated organic compounds, while preserving the pulp quality, where the prebleaching with halogen-containing bleaching agent is replaced by a treatment, in a first step, with the addition of a complexing agent at elevated temperature and at a pH from 3.1 to 9.0, and in a second step, by using a peroxide-containing compound under alka- line conditions, whereupon spent liquor from the final bleaching with halogen-containing compounds is recycled to the first or second step of the halogen-free prebleaching.

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