Two-stage peroxide bleaching process using different amounts of

Details Two-stage peroxide bleaching process using different amounts of Two-stage peroxide bleaching process using different amounts of

1990-07-06

1992-06-02

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 40, 162 41, 162 78, 162123, D21C 916, D21C 2700

Patent

active

051183897

ABSTRACT:
A continuous two-stage peroxide bleaching process operated in a single bleach plant for producing a bleached pulp of high brightness, having a second stage bleaching step using a high charge of peroxide followed by a washing stage to recover the residual liquor containing a substantial amount of the applied peroxide. The residual liquor is recycled and used for bleaching in the first stage. Only a portion of the pulp bleached in the first stage is treated in the second stage. Two or more bleached pulp products can be produced simultaneously. The bleached pulp products can be used to form different layers of a multi-layer paper products.

REFERENCES:
patent: 2942661 (1960-06-01), Beachler
patent: 3147178 (1964-09-01), Sowa
patent: 4731160 (1988-03-01), Prough et al.
patent: 4915785 (1990-04-01), Siminoski et al.
Lachenal et al., "Two-stage peroxide bleaching of mechanical pulp", Pulp & Paper Canada, Paper Presented Jun. 1988 at Orlando, Fla., at the Int. Pulp Bleaching Conf. of the Tech Sect, CPPA.
C. Gagne, M. C. Barbe and C. Deneault, "Comparison of Bleaching Processes for Mechanical and Chemimechanical Pulps", Tappi, 71 (11), pp. 89-98 (1988).

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