Process for the delignification of unbleached chemical pulp

Details Process for the delignification of unbleached chemical pulp Process for the delignification of unbleached chemical pulp

D - Textiles, Paper

21

C

9/16, 8/82

D21C 3/02 (2006.01) D21C 9/16 (2006.01)

Patent

CA 1151363

PATENT APPLICATION entitled: Process for the delignification of unbleached chemical pulp. in the name of: Groupement d'Int?r?t Economique styled: GROUPMENT EUROPEEN DE LA CELLULOSE. ABSTRACT OF THE DISCLOSURE The invention relates to a process for the delignification of unbleached chemical pulp, comprising the following stages: a) oxidation of the unbleached pulp with a peroxide, in an alkaline medium with a % ratio of peroxide/pulp with respect to the Kappa index of said pulp which may vary between 0.01 and 0.1 and a pH kept at between 9 and 12, the said oxidation stage being followed by b) mechanical pressing of the oxidized pulp, with recycling of the extraction effluents from the pressing stage, - partly above the oxidation stage, - partly-below the oxidation stage, with a view to ensure the prior dilution of the pulp oxidized before the pressing, - and if necessary partly towards the wash of the unbleached pulp. Advantages: A reduction in the quantities of reagents to be used, a saving of heat energy and a reduction of the pollution. Figure 1

349872

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