Multi-stage bleaching of pulp using successively lower power lev

Details Multi-stage bleaching of pulp using successively lower power lev Multi-stage bleaching of pulp using successively lower power lev

1974-09-20

1976-06-29

Lindsay, Jr., Robert L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With agitation or forced circulation

68181R, 162 57, 162 88, 162241, 162243, 259 6, 259 8, D21C 326, D21C 912

Patent

active

039665429

ABSTRACT:
A process for bleaching pulp in tank comprises several steps. A pulp slurry and an oxidizing agent are supplied to a first tank compartment. The mixture of pulp slurry and oxidizing agent is agitated at a first power level that corresponds to an approximate minimum power level for a maximum reaction rate on a plot of reaction rate versus power level for a first residence time. The mixture is re-agitated in another tank compartment at a second power level that corresponds to an approximate minimum power level for a maximum reaction rate on a plot of reaction rate versus power level for a second residence time. The second power level is lower than said first power level and corresponds to the amount of unreacted oxidizing agent and unreacted pulp slurry.

REFERENCES:
patent: 66353 (1867-07-01), Joy et al.
patent: 1792059 (1931-02-01), Altwegg
patent: 1827710 (1931-10-01), Leyst-Kuchenmeister
patent: 2431478 (1947-11-01), Hill
patent: 2516447 (1950-07-01), Burling et al.
patent: 2730426 (1956-01-01), Becker
patent: 3660225 (1972-05-01), Verreyne et al.
patent: 3725193 (1973-04-01), Montigny et al.
patent: 3754417 (1973-08-01), Jamieson

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