Process for bleaching lignocellulose pulp

Details Process for bleaching lignocellulose pulp Process for bleaching lignocellulose pulp

D - Textiles, Paper

21

C

D21C 9/147 (2006.01) C12S 3/08 (2006.01) D21C 5/00 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2301371

Lignocellulose pulp is bleached by bleaching a pulp in aqueous alkali solution with oxygen and treating the pulp with an enzyme, while a liquid fraction delivered from the enzyme treatment step is subjected to a penetration treatment through a separation membrane, for example, reverse osmosis membrane, to separate a permeated fraction from a non-permeated fraction; the permeated fraction is fed to the alkali-oxygen bleaching (oxygen delignification) step and is used as a liquid medium of the bleaching system; and non-permeated fraction is subjected to a xylooligosaccharide-collecting procedure.

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