Process for de-inking recycled paper pulp with a reducing agent

Details Process for de-inking recycled paper pulp with a reducing agent Process for de-inking recycled paper pulp with a reducing agent

1993-06-28

1995-07-04

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 8, D21C 502, D21C 312

Patent

active

054297168

ABSTRACT:
Recycled paper pulp is de-inked by pulping 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.

REFERENCES:
patent: 4390395 (1983-06-01), DeCeuster et al.

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