Process for de-inking recycled paper pulp

Details Process for de-inking recycled paper pulp Process for de-inking recycled paper pulp

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2099679

Recycled paper pulp is de-inked by treating it at neutral or alkaline pH with an aqueous deinking composition comprising one or more reducing agents. The preferred reducing agents are sodium bisulfite and sodium borohydride. Sodium hydroxide is preferably used to give the desired pH.

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