Chlorine-free process for bleaching pulp

Details Chlorine-free process for bleaching pulp Chlorine-free process for bleaching pulp

C - Chemistry, Metallurgy

12

S

C12S 3/08 (2006.01) D21C 5/00 (2006.01) D21C 9/10 (2006.01) D21C 9/14 (2006.01)

Patent

CA 2050986

- 18 - Case 156-7131 A B S T R A C T A chlorine-free method for bleaching chemical pulps, particularly kraftpulp, uses a first step of treating the pulp with a hemicellulose acting enzyme of a microorganism. Subsequently, the treated pulp is extracted, treated with chlorine dioxide, re-extracted and retreated with chlorine dioxide to result in a brightness level of at least 88. 6300/DH/Gro

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