Process for the de-inking of printed waste paper

Details Process for the de-inking of printed waste paper Process for the de-inking of printed waste paper

1984-08-27

1986-05-06

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 6, 162 8, D21C 502

Patent

active

045869820

ABSTRACT:
There is disclosed an improvement to the process for the de-inking of printed waste paper which comprises (1) treating the waste paper in a pulper at an alkaline pH with alkali silicate, an oxidatively active bleaching agent, one or more acid components selected from the group consisting of fatty acids and resinic acids containing more than 10 carbon atoms, and mixtures thereof, and a dispersing agent, and (2) separating the detached printing ink particles from the fiber suspension by either flotation, washing, or a combination thereof. The improvement comprises employing the acid and the dispersing agent in the form of an oil-in-water emulsion.

REFERENCES:
patent: 2112562 (1938-03-01), Fisher
patent: 4013505 (1977-03-01), Balcar et al.
patent: 4360439 (1982-11-01), Calmanti et al.

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