Method and arrangement for oxygen delignification of...

Details Method and arrangement for oxygen delignification of... Method and arrangement for oxygen delignification of...

2007-01-02

2007-01-02

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

C162S019000, C162S049000, C162S060000, C162S057000, C162S090000, C162S237000, C162S239000

Reexamination Certificate

active

10939616

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.

REFERENCES:
patent: 3769152 (1973-10-01), Samuelson et al.
patent: 4198266 (1980-04-01), Kirk et al.
patent: 4431480 (1984-02-01), Markham
patent: 5460696 (1995-10-01), Kirschner et al.
patent: 6153300 (2000-11-01), Stromberg et al.
patent: 6162324 (2000-12-01), Miller
patent: WO 01/20075 (2001-03-01), None

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