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

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

C - Chemistry, Metallurgy

12

S

195/60

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

Patent

CA 1335184

The invention concerns a procedure for the bleaching of pulp, in which procedure an oxidating bleaching chemical containing chlorine is used. The essential feature of the invention is that the pulp is treated, either in conjuction with or before oxidation, with a lignin-modifying oxidation- reduction enzyme, such as the laccase produced by the white- rot fungus. The oxidating bleaching chemical used in the procedure may be chlorine dioxide or a mixture of chlorine dioxide and chlorine gas. The use of said enzyme reduces the amount of chlorophenols and other forms of organically bound chlorine in the bleaching effluent, simultaneously lowering its chemical oxygen demand.

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