Pulp bleaching process including final stage brightening...

Details Pulp bleaching process including final stage brightening... Pulp bleaching process including final stage brightening...

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2258443

A process for bleaching lignocellulosic pulp in which a final brightening stage involves treating prebleached lignocellulosic pulp having a brightness with at least one peroxymonosulfuric acid salt to increase the brightness of the prebleached lignocellulosic pulp and provide a more fully bleached pulp. The more fully bleached pulp is not subjected to further brightening or delignification operations during the remainder of the process subsequent to the final brightening stage. The treatment is conducted at an initial pH at commencement of the final brightening stage in a range of from about 7 to about 12 and a final pH at the end of said final brightening stage in a range of from about 3 to about 9.

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