Bleaching recycled pulp with a reductive-oxidative sequence

Details Bleaching recycled pulp with a reductive-oxidative sequence Bleaching recycled pulp with a reductive-oxidative sequence

1993-12-23

1995-11-07

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 7, 162 8, 162 65, D21C 502, D21C 9153

Patent

active

054645018

ABSTRACT:
The invention relates to a method of bleaching waste paper pulp. The pulp is first treated to a reductive chemical followed by acidification and washing or dewatering. The pulp is then subjected to ozone and then to hydrogen peroxide. The reductive chemical used is either formamidine sulphinic acid or sodium hydrosulfite.

REFERENCES:
patent: 3318657 (1967-05-01), Wade
patent: 5211809 (1993-05-01), Naddes et al.
Angulo "Environmentally Safe Bleaching of Post Consumer Waste Papers" TAPPI Conference Oct. 1990.

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