Method for controlling the addition of active chemical for delig

Details Method for controlling the addition of active chemical for delig Method for controlling the addition of active chemical for delig

1977-02-09

1980-03-11

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

23230A, 162 80, 162DIG10, D21C 910, G01N 3116, G01N 3300

Patent

active

041927087

ABSTRACT:
A method is provided for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in an aqueous liquor containing at least one chemical reactive with such active chemical, which comprises determining the amount of active chemical consumed by the chemical reactive with the active chemical in the liquor; adding the active chemical to the cellulose pulp suspension; and then after a predetermined time interval determining the amount of active chemical consumed by the chemical and cellulose pulp reactive with the active chemical in the liquor; from these determinations determining the amount of active chemical consumed by the pulp; and then carrying out the delignification and/or bleaching with an amount of active chemical adjusted according to the amount of active chemical consumed by the pulp.

REFERENCES:
patent: 2783135 (1957-02-01), Locchbrandt
patent: 3764463 (1973-10-01), Histed et al.
patent: 3888726 (1975-06-01), Haltman
patent: 3890517 (1976-09-01), 3,980,517
patent: 4013506 (1977-03-01), Histed et al.
Casey; Pulp & Paper vol. I, Second Ed. Interscience Publishers, Inc., New York, 1960, pp. 456-457.
Burnett "Computer Control of the Chlorine Stage" Pulp and Paper Magazine of Canada; vol. 71, No. 14.

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