Method and system for the treatment of pulp prior to ozone...

Details Method and system for the treatment of pulp prior to ozone... Method and system for the treatment of pulp prior to ozone...

2007-11-13

2007-11-13

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

C162S009000, C162S024000, C162S025000, C162S052000, C162S090000, C162S181200, C162S236000, C162S238000

Reexamination Certificate

active

10497753

ABSTRACT:
A system for treating pulp comprises a dewatering device (2) for dewatering the pulp to a fiber concentration of at least 20%, a closed pulp-shredding vessel (16) for shredding the dewatered pulp, and an outlet pipe (22) from the pulp-shredding vessel. A transport screw (18) is arranged in the outlet pipe for transporting the shredded pulp from the pulp-shredding vessel through the outlet pipe through a reactor vessel (6) for bleaching the shredded pulp through reaction with ozone gas. The outlet pipe (22) is designed with a heightened roof portion (27), so that an upper gas space (29) free from pulp is formed in the outlet pipe between the roof portion and the transport screw. A flow-restraining member in the form of a partition wall (31) is arranged in the upper gas space in the outlet pipe for restraining the gas flow through the gas space, whereby the pumping action of the transport screw in the outlet pipe is decreased.

REFERENCES:
patent: 4278496 (1981-07-01), Fritzvold
patent: 5626297 (1997-05-01), Carlsmith et al.
patent: 6210532 (2001-04-01), Shackford
patent: 6989078 (2006-01-01), Bokstrom et al.
patent: WO-96/05365 (1996-02-01), None
patent: WO-00/77296 (2000-12-01), None

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