Method and arrangement for measuring the content of...

Details Method and arrangement for measuring the content of... Method and arrangement for measuring the content of...

G - Physics

01

N

G01N 7/18 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2275751

The invention relates to a method and a device for measuring the content of chemicals used in connection with bleaching of preferably cellulose fibres in a pulp suspension for the purpose of providing a better and more uniform product quality and preventing overdosage of the bleaching chemical used. According to the invention a measurement sample is derived from a predetermined volume of the pulp suspension after or during the bleaching. Further, a catalyst in the shape of the enzyme catalase is added to the sample , which is agitated so that the bleaching chemical is decomposed and oxygen gas is generated, which oxygen gas pushes out a certain sample volume for the measurement sample, which sample volume is directly or indirectly converted, e.g. via a simple algorithm, to a value representing the content of the bleaching chemical used.

Cette invention a trait à un procédé ainsi qu'au dispositif correspondant permettant de mesurer la concentration en produits chimiques utilisés lors d'une opération de blanchiment de fibres de cellulose d'une pâte en suspension et ce, afin d'obtenir un produit plus homogène et de meilleure qualité ainsi que d'éviter un surdosage des agents chimiques de blanchiment employés. On prélève, au titre de cette invention, un échantillon dans une quantité prédéterminée de pâte en suspension après le blanchiment ou lors de celui-ci. On ajoute un catalyseur, une catalase notamment, à cet échantillon que l'on agite de manière à décomposer l'agent de blanchiment et à produire de l'oxygène, lequel oxygène expulse une certaine quantité d'échantillon que l'on convertit, directement ou indirectement, au moyen d'un algorithme simple, en valeur de concentration en agent de blanchiment employé.

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