Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Charging and/or discharging fibrous material
Patent
1985-05-03
1989-12-12
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Charging and/or discharging fibrous material
162 53, 162 57, 162 65, 162243, 261 76, 261122, 261DIG75, D21C 9147, D21D 526
Patent
active
048865770
ABSTRACT:
Oxygen delignification of paper pulp (comminuted cellulosic material in a slurry) at medium consistency (i.e., about 6-18%) is practiced without the necessity of a separate mixer. The pulp is drawn into the inlet of a fluidizing centrifugal pump capable of pumping medium consistency pulp. The pump typically has a vacuum system associated with it for effecting degassing of the pulp. As the pulp is pumped out of the pump outlet, oxygen gas is added to the pulp. This is accomplished utilizing a shear plate having a central opening and one or more radial bores, oxygen being introduced under pressure into the bores to pass into the pulp flowing through the plate central opening. A tube may be disposed in the bore(s) and have an oxygen permeable portion (such as a porous stone or sintered metal) extending into the central opening in the plate, the oxygen being introduced in the form of very small bubbles by the oxygen permeable portion.
REFERENCES:
patent: 3293117 (1966-12-01), Pennington, Jr. et al.
patent: 3832276 (1974-08-01), Ruymoulik et al.
patent: 4427489 (1984-01-01), Jacobson
patent: 4539120 (1985-09-01), Robinson
Alvo Steve
Kamyr Inc.
LandOfFree
Method and apparatus for mixing oxygen gas with medium consisten does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for mixing oxygen gas with medium consisten, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for mixing oxygen gas with medium consisten will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2120039