C - Chemistry – Metallurgy – 12 – S
Patent
C - Chemistry, Metallurgy
12
S
195/60
C12S 3/08 (2006.01) D21C 5/00 (2006.01) D21C 9/10 (2006.01) D21C 9/14 (2006.01) D21C 9/147 (2006.01)
Patent
CA 1339593
The invention concerns a procedure for the bleaching of pulp using oxygen as an oxidating bleaching chemical. The essential features of the invention are that oxygen is used in the first oxidation stage of the bleaching process, that the pulp is subjected to enzyme treatment, and that after oxygen bleaching and enzyme treatment, the pulp is washed. According to the invention, the subsequent oxidation stages can be implemented using bleaching chemicals containing chlorine, e.g. chlorine gas and/or chlorine dioxide. The use of enzymes allows partial burning of the washings and enables the amounts of toxic compounds in the bleaching effluent to be reduced, simultaneously lowering its chemical oxygen demand.
611771
Jokela Veikko
Miikki Kari
Ruohoniemi Kimmo
Vaheri Marja
Enzo-Gutzeit Oy
Jokela Veikko
Marks & Clerk
Miikki Kari
Ruohoniemi Kimmo
LandOfFree
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