Method for controlling the addition of active chemical for...

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

D - Textiles, Paper

21

C

9/2, 8/78

D21C 3/22 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1068054

ABSTRACT OF THE DISCLOSURE 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.

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