Process for preparing pulp out of lignocellulosic raw material

Details Process for preparing pulp out of lignocellulosic raw material Process for preparing pulp out of lignocellulosic raw material

D - Textiles, Paper

21

C

8/82

D21C 3/26 (2006.01) D21C 3/04 (2006.01) D21C 9/16 (2006.01)

Patent

CA 1284557

ABSTRACT: Lignocellulosic raw material is pulped with a cooking liquor containing organic peroxyacids, such as peroxyformic acid or peroxyacetic acid, and the defibred pulp is bleached with an alkaline solution containing hydrogen peroxide, the initial pH of which is at least 10, and which is provided by adding to a sodium hydroxide solution hydrogen peroxide in an amount which calculated as per cents of the dry weight of the matter coming to the treatment corresponds to from 0.20 to 0.80, preferably from 0.25 to 0.70 and most preferably from 0.45 to 0.65 times the kappa number of the pulp obtai- ned from the previous stage of the process.

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