Ozone bleaching process

Details Ozone bleaching process Ozone bleaching process

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2102899

Method and apparatus for ozone bleaching a medium consistency cellulosic fiber suspension include feeding the fiber suspension and an ozone in carrier gas stream under pressure into a fluidizing mixer (14); intimately and uniformly mixing the fiber suspension with the ozone to achieve a bleaching reaction; passing the mixture into a first reaction vessel (22) to permit the bleaching reaction to proceed and to consume a major part of the ozone; adding a second bleaching chemical to the mixture; separating the excess ozone and carrier gas from the mixture in a second considerably larger vessel (32) and removing the fiber suspension from the second vessel after the effective second bleaching reaction.

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