Delignification and bleaching of a lignocellulosic pulp...

Details Delignification and bleaching of a lignocellulosic pulp... Delignification and bleaching of a lignocellulosic pulp...

D - Textiles, Paper

21

C

9/2

D21C 9/10 (2006.01)

Patent

CA 1090510

ABSTRACT OF THE DISCLOSURE A process for the delignification and bleaching of a lignocellulosic pulp slurry, having a consistency between about 1% and 10%, by weight of oven-dried pulp, and a pH between about 1 and 7, while at a temperature between about 0°C. and 70°C., with a gaseous mixture selected from the group consisting of ozone/oxygen, ozone/air, and mixtures thereof. The ozone con- taining gaseous mixture, which has an ozone concentration of from about 0.1% to about 20%, by weight of oxygen or air, is bubbled into the pulp slurry, while agitating the pulp-water- gas mixture at a rate of about 0.01 to 5.0 horsepower-days per ton of pulp.

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