Reduction of halogenated organic compounds in spent bleach...

D - Textiles – Paper – 21 – C

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D21C 9/12 (2006.01) C02F 1/02 (2006.01) D21C 11/00 (2006.01) C02F 1/72 (2006.01)

Patent

CA 2040867

The present invention relates to a method of reducing the content of halogenated organic compounds in the spent bleach liquor from the bleaching of lignocellulose-contain- ing material with compounds containing halogen, wherein the spent bleach liquor, in a stage where no essential deligni- fication or bleaching of the pulp takes place, is maintai- ned at a pH of from 2.5 up to about 10, and wherein the residence time and the temperature are selected such that the amount of dissolved halogenated organic substances in the spent bleach liquor is reduced by at least 30%.

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