Method of bleaching high consistency pulp with ozone

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With agitation or forced circulation

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162 65, D21C 9153

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051748614

ABSTRACT:
A method for delignifying and bleaching a lignocellulosic pulp with a gaseous bleaching agent in a reactor without the use of elemental chlorine. The bleaching reactor is a horizontal vessel having a central rotatable shaft which preferably contains paddles, cut and folded screw flights or a ribbon flight, to disperse and advance the pulp particles in a plug flow manner while contacting and mixing the pulp particles with a gaseous bleaching agent such as ozone for substantially uniform bleaching thereof.

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