Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1991-04-23
1992-09-22
silverman, Stanley S.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210908, 210917, 210928, 210759, 210753, 210754, 162 29, 162301, 1623011, D21C 916
Patent
active
051494426
ABSTRACT:
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-containing material with compounds containing halogen, wherein the spent bleach liquor, in a stage where no essential delignification or bleaching of the pulp takes place, is maintained 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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Herstad Solvie M.
Larsson Kenneth O.
Nystrom Mats G.
Skogby Anna K.
Eka Nobel AB
McCarthy Neil M.
Silverman Stanley S.
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