Method for determining chemical pulp kappa number with...

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G01N 21/35 (2006.01) D21C 7/12 (2006.01) D21C 9/02 (2006.01) G01N 33/46 (2006.01)

Patent

CA 2599033

A method for the determination of cellulosic-fibre properties, such as, residual lignin content of chemical pulp, with the aid of a spectroscopic technique obtained over a range covering the visible and the near-infrared regions of the electromagnetic spectrum, comprising the steps of obtaining a sample from the process line, minimally removing some excess water, exposing the fibres in the sample to a large beam light source, optionally moving the sample at a constant speed, and acquiring the spectral data over a pre- determined length of time, and correlating the spectrum to a previously determined calibration so as to determine the Kappa number. Alternatively, as an arrangement for process control, the instant invention includes the mounting of the excitation light source and fibre-optic probe along the various locations of the kraft cooking and bleaching process, such as 1) at the drum brownstock washers and 2) throughout the bleach plant deckers, located just before the doctored blade, the probe being connected to a fast scanning spectrometer, via fibre optic cables, with a computer sequencing spectral acquisition and correlating the spectrum against a predetermined calibration, and logging the results.

L~invention concerne un procédé de détermination de propriétés de fibres de cellulose, comme la teneur en lignine résiduelle de pulpe chimique, à l~aide d~une technique spectroscopique sur une plage couvrant les régions visibles et proches de l~infrarouge du spectre électromagnétique, comprenant les phases d~obtention d~un échantillon de la ligne de traitement, d~enlèvement minimum d~eau en excès, d~exposition des fibres dans l~échantillon à une source lumineuse de large faisceau, éventuellement de déplacement de l~échantillon à vitesse constante, et d~acquisition des données spectrales sur une longueur de temps prédéterminée, et de corrélation du spectre avec un calibrage défini au préalable pour déterminer l~indice kappa. En variante, pour contrôler le processus, l~invention comporte le montage de la source de lumière d~excitation et de la sonde à fibre optique le long de divers emplacements de cuisson du kraft et de blanchiment, comme 1) au niveau des lessiveuses à tambour de pâte non blanchie et 2) tout au long des installations de blanchiment, situées juste avant la lame de découpe, la sonde étant connectée à un spectromètre à balayage rapide, par le biais de câbles à fibre optique, avec un ordinateur permettant de séquencer l~acquisition spectrale et de corréler le spectre par rapport à un calibrage prédéterminé, avant de consigner les résultats.

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