Bleaching with ozone-chlorine mixtures

Details Bleaching with ozone-chlorine mixtures Bleaching with ozone-chlorine mixtures

D - Textiles, Paper

21

C

8/78.1

D21C 9/12 (2006.01) D21C 9/14 (2006.01) D21C 9/153 (2006.01)

Patent

CA 1332262

ABSTRACT Ozone and chlorine are used to bleach cellulosic fibrous material pulp in the production of kraft pulp for paper and paper products, being applied together in a mixture. When the ozone and chlorine are applied simultaneously it is possible to achieve delignification to a greater extent than is possible utilizing chlorine at any level. The total chlorinated ring compounds in the bleach plant effluent are remarkably reduced utilizing the ozone-chlorine mixture, compared to all chlorine, with resulting decrease in the fish toxicity of the bleach plant effluent. Utilizing an O3/Cl2 Eo D bleaching sequence (only three stages) it is possible to obtain pulp with 90 TAPPI Absolute, or greater, brightness.

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