Brightening color dyed wastepaper with a bleaching agent and a q

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 7, 162 8, D21B 108

Patent

active

055804225

ABSTRACT:
A method for brightening fiber from colored waste paper comprising bleaching pulp from colored waste paper with sodium hydrosulfite, formamidine sulfinic acid, or hydrogen peroxide in the presence of a selected quaternary compound.

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