Wood pulp reactor

Details Wood pulp reactor Wood pulp reactor

1995-06-28

1997-01-07

Alvo, Steven

Paper making and fiber liberation

Apparatus

Digester

162241, 162243, 422185, 422189, D21C 700, D21C 9147

Patent

active

055913083

ABSTRACT:
An oxygen delignification method and apparatus in which a charge of heated wood pulp is reacted with oxygen in the presence of a charge of caustic soda in a plurality of reaction stages located between mixing stages in which caustic is mixed with the wood pulp. The use of the plurality of mixing stages reduces peak pH exposure of the wood pulp that would otherwise occur if the charges of caustic and wood pulp were mixed all at once. Moreover, the caustic mixed in such manner replenishes neutralized caustic and ensures that the average pH level is increased above that in conventional oxygen delignification. The increase in average pH level favors an increase in the delignification. Filtrate from a washing stage is introduced into the mixing stages to prevent wood pulp degradation. Oxygen is mixed within the wood pulp by a wood pulp mixer that employs coaxial perforate passageways between which the wood pulp is retained and driven but which allow the oxygen to pass in an inward radial direction of the passageways to mix with the wood pulp.

REFERENCES:
patent: 3843473 (1974-10-01), Samuelson et al.
patent: 3963561 (1976-04-01), Richter
patent: 5034095 (1991-07-01), Kido et al.

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