Process for reducing the amount of halogenated organic compounds

Details Process for reducing the amount of halogenated organic compounds Process for reducing the amount of halogenated organic compounds

1991-04-23

1992-09-01

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 76, 162 78, 162 88, D21C 914, D21C 916

Patent

active

051435802

ABSTRACT:
A process for delignification and bleaching of chemically digested lignocellulose-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 alkaline 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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