Process for removal of metal compounds in lignocellulosic pulp

Details Process for removal of metal compounds in lignocellulosic pulp Process for removal of metal compounds in lignocellulosic pulp

D - Textiles, Paper

21

C

8/78

D21C 9/147 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2191081

The present invention solves the problem of suppressing disturbing effects of transition and alkaline earth metal compounds during bleaching of chemically digested lignocellulosic pulp in a sequence with oxygen bleaching prior to oxidative stages with introduction of for instance ozone, superoxides, hydrogen peroxide and peroxy acids. The conditions during the oxygen bleaching are chosen so that the properties of these metal compounds are changed and the compounds removed from the pulp during the oxygen bleaching under such conditions that the attack on the cellulose is small and the fluctuations of the pulp quality due to fluctuating amounts of these metal compounds decrease markedly.

La présente invention résout les problèmes associés aux effets perturbateurs de composés de métaux de transition et de métaux alcalino-terreux durant le blanchiment de pâte de lignocellulose ayant subi une digestion chimique, puis un blanchiment par l'oxygène et enfin une oxydation, par exemple par l'ozone, des superoxydes, le peroxyde d'hydrogène ou des peroxyacides. Les conditions durant le blanchiment à l'oxygène sont choisies pour que les propriétés de ces composés métalliques soient changées et que ces composés soient extraits de la pâte, tout en maintenant des conditions durant ce blanchiment par l'oxygène telles que la cellulose soit peu attaquée. Dans ces conditions, les fluctuations de la qualité de la pâte dues aux fluctuations de la quantité de ces composés métalliques diminuent d'une manière marquée.

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