Process for controlling the supply of delignifying and/or bleach

Details Process for controlling the supply of delignifying and/or bleach Process for controlling the supply of delignifying and/or bleach

1978-05-05

1982-09-07

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162DIG10, 422 62, D21C 910, G06F 1546

Patent

active

043482562

ABSTRACT:
A method is provided for controlling the supply of delignifying and/or bleaching chemicals in the continuous delignification and/or bleaching of lignocellulosic material such as wood and pulp in a through flow delignification and/or bleaching stage which commprises admixing the lignocellulosic material with delignifying and/or bleaching chemicals and flowing the lignocellulosic material under delignifying and/or bleaching conditions through the stage while controlling the addition of the delignifying and/or bleaching chemicals according to the ratio of the quantity of delignifying and/or bleaching chemicals consumed to the quantity of delignifying and/or bleaching chemicals originally charged, referred to hereinafter as relative consumption, the time and the temperature in a manner to maintain substantially constant the relative consumption of delignifying and/or bleaching chemicals at a predetermined time by the lignocellulosic material during flow through the stage.

REFERENCES:
patent: B300004 (1975-01-01), Putman
patent: 3486971 (1969-12-01), Weyrick
patent: 3562384 (1972-03-01), Sloman
patent: 3679543 (1972-07-01), Rivers
patent: 3962029 (1976-06-01), Wettermark et al.
Casey; Pulp & Paper, vol. I Second Ed., Interscience Publishers, Inc., New York, 1960 pp. 426-427.
Burnett; "Computer Control of the Chlorine Stage"; Pulp & Paper Magazine of Canada, vol. 71, No. 14, Jul. 17, 1970.

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