Cleaning and bleaching of secondary fiber

Details Cleaning and bleaching of secondary fiber Cleaning and bleaching of secondary fiber

1991-11-13

1993-08-10

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 6, 162 8, 162 65, 162 66, 162 89, D21C 502, D21C 912, D21C 9147

Patent

active

052345440

ABSTRACT:
Secondary pulp is deinked and bleached by contacting the pulp simultaneously with oxygen, alkali, and a surfactant in a reaction zone followed by washing to recover a secondary fiber product. Simultaneous contacting with oxygen and surfactant yields higher pulp brightness than sequential contacting in oxygen bleaching and washing stages, and enhances bleachability in further bleaching stages.

REFERENCES:
patent: 4360439 (1982-11-01), Calmanti et al.
patent: 4381969 (1983-05-01), DeCeuster et al.
patent: 4390395 (1983-06-01), DeCeuster et al.
patent: 4416727 (1983-11-01), Elton et al.
patent: 4935096 (1990-06-01), Gallagher et al.
Markham, L. D., et al; TAPPI 1988 Pulping Conf. Proceedings; pp. 189-196.

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