Procedure for bleaching cellulose pulp involving the use of...

Details Procedure for bleaching cellulose pulp involving the use of... Procedure for bleaching cellulose pulp involving the use of...

C - Chemistry, Metallurgy

12

S

195/59

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

Patent

CA 1334581

The present invention concerns a procedure for bleaching cellulose pulp obtained from hardwood, wherein bleaching chemical containing chlorine is used. The essential feature of the invention is that the residual chlorine content of the bleached pulp is reduced by subjecting the pulp to enzyme treatment. With the enzyme especially the removal from the pulp of chlorine-binding extractive substances present in hardwood pulp is promoted. The invention furthermore concerns the use of enzyme towards lowering the residual chlorine content of bleached cellulose pulp made from hardwood. Such cellulose pulp is particularly contemplated which will be converted into foodstuff package cardboard or paper, which are commonly disposed of by burning. Lowered chlorine content reduces the risk of producing toxic dioxin at the incineration step.

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