Method and apparatus for ozone bleaching of cellulosic pulp...

Details Method and apparatus for ozone bleaching of cellulosic pulp... Method and apparatus for ozone bleaching of cellulosic pulp...

D - Textiles, Paper

21

C

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

Patent

CA 2186176

A method of bleaching a pulp at low consistency employs chlorine dioxide and/or chlorine, to partially bleach the pulp, the aqueous partially bleached pulp flows along a sinuous flow path providing a high ratio of flow path of aqueous pulp to length of effective travel of the aqueous pulp. Ozone is introduced to the aqueous pulp at spaced apart locations in the flow path so that a low partial pressure of ozone is established in the flow path which favours chemical oxidation of the lignin and low chemical attack on cellulose. In this way effective bleaching is achieved with reduced use of chlorine or chlorine dioxide and reduced production of chlorinated compounds.

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