G - Physics – 01 – N
Patent
G - Physics
01
N
73/51.5
G01N 21/76 (2006.01) D21C 9/10 (2006.01)
Patent
CA 1292887
Method in the bleaching of cellulose pulp ABSTRACT When bleaching cellulose pulp with strongly oxidative bleaching agents there is the need for an analysis method which is capable of quickly providing a correct analysis result without complicated manipulation of the bleaching liquor sample. The present invention satisfies this need and relates to a method for measuring the chemical content of bleaching liquor within the cellulose pulp industry, in which a sample of the bleaching liquor is brought together with one or more reagents, of which at least one is chemi- luminescent so as to result in the emission of light, and the intensity of the light is determined as a measurement of the chemical content. The method is characterized in that a constant flow of reagent is advanced continuously through a conduit system and in that a small quantity of sample liquor is introduced sporadically or intermittently into said rea- gent flow so as to produce a chemiluminescent reaction, and in that the reaction, and therewith the emission of light, is caused to continue for a given period of time such that the light intensity falls within the measuring range of a light responsive device, and in that, with repeated measure- ments the light intensity is constantly measured after said time interval, and in that measured values of the light in- tensity are converted to the content of bleaching chemical. The invention also relates to apparatus for carrying out the aforedescribed method.
523659
Gidlund Claes-Goran
Ostman Hakan E.
Macrae & Co.
Mo Och Domsjo Aktiebolag
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