Method to improve kraft pulp brightness and bleachability...

D - Textiles – Paper – 21 – C

Patent

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Details

IPC codes

D21C 9/10 (2006.01) D21C 3/06 (2006.01)

Type

Patent

Patent number

CA 2363939

Description

Disclosed is a method for bleaching pulp, comprising adding to a wood pulp an agent selected from the group consisting of peroxymonosulfuric acid, sulfurous acid, and mixtures thereof, in a sufficient amount of said agent to adjust the pH of said pulp to below 6, and sufficient oxygen to provide an oxygen pressure over said pulp of 1 to 10 bars, under conditions of temperature and time effective to bleach said pulp.

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