Two-stage kraft cooking

D - Textiles – Paper – 21 – C

Patent

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D21C 3/26 (2006.01) D21C 3/02 (2006.01)

Patent

CA 2195297

A method for the production of kraft pulps in a digester, by modifying the cooking chemical concentration, and lignin concentrationprofiles during the cook, has provided extended delignification and improved selectivity in a simpler way than has previously been possible. The cooking is performed at an elevated temperature in two stages. The first stage liquor is a mixture of 1) the spent liquor of the second stage and 2) a portion of the conventional charge of fresh cooking chemicals needed for the complete cook. The second stage liquor is made up by adding an aqueous diluent, for example, fresh water or washing filtrate to the remaining portion of the fresh cooking chemicals.

Un procédé de production de pâtes kraft dans un lessiveur, consistant à modifier les profils de concentration des agents chimiques de cuisson et de concentration de lignine au cours de la cuisson, permet d'obtenir une délignification extensive et une sélectivité améliorée plus simplement qu'il n'était à ce jour possible. La cuisson est effectuée à une température élevée et en deux étapes. La liqueur de la première étape est un mélange de (1) la liqueur épuisée de la seconde étape et (2) une partie de la charge conventionnelle d'agents de cuisson chimiques renouvelés nécessaires à la cuisson complète. La liqueur de la seconde étape est obtenue par addition d'un diluant aqueux, par exemple de l'eau douce ou un filtrat de lavage, à la partie résiduelle des agents de cuisson chimiques renouvelés.

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