Paper making and fiber liberation – Apparatus – Digester
Patent
1994-03-08
1995-09-19
Alvo, Steve
Paper making and fiber liberation
Apparatus
Digester
162 18, 162 65, 162243, 162246, 422225, 422226, 422229, D21C 700, D21C 9153
Patent
active
054512964
ABSTRACT:
A two stage ozone-pulp bleaching method and apparatus are disclosed. In the first stage, high consistency pulp particles are turbulently mixed and contacted with a gaseous mixture containing ozone to mix and contact substantially all of the pulp particles with ozone to react at least a portion of the pulp particles with the ozone. Pulp particles and gaseous bleaching mixture are then directed to a second stage including a quiescent pulp bed. Pulp particles may complete their reaction in the bed, which also serves to strip ozone which was not contacted with pulp particles in the first stage from the gaseous bleaching mixture.
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Friend William H.
Pikulin Michael A.
Alvo Steve
Union Camp Patent Holding, Inc.
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