Paper making and fiber liberation – Apparatus – Digester
Patent
1990-10-26
1993-01-26
Alvo, Steve
Paper making and fiber liberation
Apparatus
Digester
162243, 162246, 162 65, 422229, D21C 700, D21C 9153
Patent
active
051819899
ABSTRACT:
An apparatus for delignifying and bleaching a lignocellulosic pulp 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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Melnyk e
Friend William H.
Gandek Thomas P.
Pikulin Michael A.
White David E.
Alvo Steve
Union Camp Patent Holdings Inc.
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