Simplified bleaching process

Details Simplified bleaching process Simplified bleaching process

1979-04-30

1980-12-09

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With washing

162 89, D21C 914

Patent

active

042382815

ABSTRACT:
A multi-stage, bleaching process for alkaline cooked pulps, including at least four bleaching stages and no more than three washing steps, is provided, wherein certain of the bleaching stages are shortened to less than about 15 minutes.

REFERENCES:
patent: Re28884 (1976-06-01), Jack et al.
patent: Re28887 (1976-06-01), Jack et al.
patent: 2587064 (1952-02-01), Rapson
patent: 3698995 (1972-10-01), Rapson
patent: 3865685 (1975-02-01), Hebbel et al.
patent: 3874992 (1975-04-01), Liebergott
patent: 4013506 (1977-03-01), Histed et al.
patent: 4104114 (1978-08-01), Rowlandson et al.
Kamyr Displacement Bleaching-a case story, Kamyr Bulletin, 187E, 1978, 162-189.
Tappi, vol. 57, No. 11, Nov. 1974, pp. 105-108.
Tappi, vol. 59, No. 3, Mar. 1976, pp. 75-77.
Tappi, vol. 55, No. 6, Jun. 1972, pp. 933-936, 937-940.
"The Bleaching of Pulp", Monograph No. 27, Chapter 17, pp. 346 et seq., Tappi, (1963).

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