Oxygen bleaching in the presence of a catalyst

Details Oxygen bleaching in the presence of a catalyst Oxygen bleaching in the presence of a catalyst

D - Textiles, Paper

21

C

8/78.1, 9/16.5

D21C 9/10 (2006.01) D21C 3/02 (2006.01)

Patent

CA 1043514

ABSTRACT OF THE DISCLOSURE During the delignification and bleaching of lignocellulosic pulp fibers with oxygen in an alkaline medium, the rate of deligni- fication can be increased, while simultaneously protecting the pulp against excessive losses in viscosity, by contacting a slurry of lignocellulosic pulp fibers with a solution of water- soluble salt of a divalent transition metal selected from the group consisting of mangenous, nickelous, cobaltous, and vanadous ions having a concentration at least about 0.27% to about 1.10%, based on the weight of oven-dried (O.D.) pulp.

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