Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Reexamination Certificate
2002-01-18
2008-01-22
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
C162S074000, C162S078000, C008S101000, C008S107000, C008S115000, C008S094240, C435S278000
Reexamination Certificate
active
07320741
ABSTRACT:
A method of bleaching chemical pulp with xylanase after chemical bleaching is provided. The method comprises the steps of exposing chemical pulp to a chlorine dioxide bleaching stage to produce a partially bleached pulp, treating the partially bleached pulp with a xylanase in an enzyme treatment stage at a pH of about 3 to about 8, then carrying out an alkaline extraction of the pulp. The pulp bleaching method of the present invention may be performed in a pulp mill as part of a complex pulp bleaching process.
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Popovici Corina
Thibault Luc
Tolan Jeffrey S.
Fitzpatrick ,Cella, Harper & Scinto
Halpern Mark
Iogen Bio-Products Corporation
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