Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 2, 2007
Patent Application Number
10939616
Date Filed
September 13, 2004
Patent Primary Examiner
Patent abstract
The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an optimal predetermined end-pH is obtained. This provides advantages in the subsequent bleaching since the bleachability is substantially improved in the form of reduced need for bleaching chemicals.
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