METHOD FOR CONTROLLING THE ADDITION OF ACTIVE CHEMICAL FOR DELIGNIFYING AND/OR BLEACHING CELLULOSE PULP SUSPENDED IN A LIQUOR CONTAINING CHEMICALS REACTIVE WITH THE DELIGNIFYING AND/OR BLEACHING CHEMICAL

摘要

ABSTRACT OF THE DISCLOSUREA method is provided for controlling the addition of active chemicalfor delignifying and/or bleaching cellulose pulp suspended in an aqueous liquorcontaining at least one chemical reactive with such active chemical, whichcomprises determining the amount of active chemical consumed by the chemicalreactive with the active chemical in the liquor; adding the active chemical tothe cellulose pulp suspension; and then after a predetermined time intervaldetermining the amount of active chemical consumed by the chemical andcellulose pulp reactive with the active chemical in the liquor; from thesedeterminations determining the amount of active chemical consumed by thepulp; and then carrying out the delignification and/or bleaching with an amountof active chemical adjusted according to the amount of active chemicalconsumed by the pulp.