Method of whitening lignin-containing paper pulps

Details Method of whitening lignin-containing paper pulps Method of whitening lignin-containing paper pulps

1996-12-13

1999-05-11

Silverman, Stanley S.

Paper making and fiber liberation

Processes and products

Non-fiber additive

162160, 162183, 8648, 8919, D21H11/00

Patent

active

059024542

ABSTRACT:
A process to increase the whiteness of paper made from a lignin-containing pulp is disclosed which comprises adding to an aqueous slurry comprising a lignin-containing pulp, in the paper making step, an effective amount of a chelating agent to decrease the content of salts of iron and other heavy metals to 100 ppm or less by weight, based on the dry weight of the pulp, or adding to said aqueous slurry an effective amount of a fluorescent whitening agent, or both a) and b).

REFERENCES:
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patent: 4339238 (1982-07-01), Fringeli et al.
patent: 4599138 (1986-07-01), Lindahl
patent: 5227022 (1993-07-01), Leonhardt et al.
patent: 5248389 (1993-09-01), Heimburger et al.
patent: 5266078 (1993-11-01), Welkener et al.
patent: 5332471 (1994-07-01), Naddeo et al.

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