High temperature deinking method using an alkylene oxide adduct

Details High temperature deinking method using an alkylene oxide adduct High temperature deinking method using an alkylene oxide adduct

1995-05-09

1997-09-30

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 75, 162 77, D21C 502

Patent

active

056722443

ABSTRACT:
In the deinking of feed waste papers comprising magazines and newspapers at a weight ratio of magazine to newspaper of from 5/95 to 60/40, a reclaimed pulp with excellent qualities can be obtained by adjusting the treating temperature in the flotation step to 40.degree. to 80.degree. C. and adding a deinking agent, which contains an alkylene oxide adduct of an oil or fat, wherein said alkylene oxide adduct comprises ethylene oxide and propylene oxide added at a molar ratio of ethylene oxide to propylene oxide of from 1/1 to 5/1, and has a cloud point of 45.degree. to 90.degree. C., at least in one of the steps of the deinking process.

REFERENCES:
patent: 5100574 (1992-03-01), Urushibata et al.
patent: 5221433 (1993-06-01), Daute et al.
patent: 5281358 (1994-01-01), Urushibata et al.
patent: 5304316 (1994-04-01), Urushibata et al.

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