Process of and composition for de-inking waste paper as well as

Details Process of and composition for de-inking waste paper as well as Process of and composition for de-inking waste paper as well as

1984-04-06

1984-12-11

Smith, William

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 6, 162 8, 162 78, 162 80, D21C 502

Patent

active

044876556

ABSTRACT:
The novel, advantageous, and economical process of reclaiming printed waste paper comprises subjecting waste paper to a flotation de-inking process. The degree of whiteness of the reclaimed paper is considerably increased by the addition of specific phosphonic acid compounds to the de-inking bath. Hydroxy carboxylic acids, amino carboxylic acids, polycarboxylic acids as well as magnesium sulfate may also be added to the de-inking bath containing the phosphonic acids.

REFERENCES:
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patent: 4347099 (1982-08-01), De Ceoster et al.
patent: 4381969 (1983-05-01), De Cuester et al.
patent: 4390395 (1983-06-01), De Cuester et al.
Lachenal et al., "Hydrogen Peroxide as a Delignifying Agent", TAPPI, vol. 63, No. 4, pp. 119-122, (Apr. 1980).
Abstract of Stettler, "Special Problems in De-inking Waste Paper", 1004 Abstract Bulletin of the Institute of Paper Chemistry, vol. 50, No. 11, p. 1108, (May 1980) and No. 10355 Appleton, Wisconsin.
Lachenal, D. et al., "Hydrogen Peroxide Association of the Pulp and Paper Industry, vol. 63, No. 4, Apr. 1980, p. 119.
Pfalzer, L., "Deinking of Secondary Fiberts," TAPPI Journal of the Technical Association of the Pulp and Paper Industry, vol. 63, No. 9, Sep. 1980, p. 113.

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