Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1992-08-27
1997-03-04
Alvo, Steven
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 57, 162 65, 162 78, 162 88, 162 90, D21C 914, D21C 9153, D21C 916
Patent
active
056075456
ABSTRACT:
Method and apparatus for ozone bleaching a medium consistency cellulosic fiber suspension include feeding the fiber suspension and an ozone in carrier gas stream under pressure into a fluidizing mixer; intimately and uniformly mixing the fiber suspension with the ozone to achieve a bleaching reaction; passing the mixture into a first reaction vessel to permit the bleaching reaction to proceed and to consume a major part of the ozone; adding a second bleaching chemical to the mixture; separating the excess ozone and carrier gas from the mixture in a second considerably larger vessel and removing the fiber suspension from the second vessel after the effective second bleaching reaction.
REFERENCES:
patent: 4278496 (1981-07-01), Fritzvold et al.
patent: 4450044 (1984-05-01), Fritzvold et al.
patent: 4834837 (1989-05-01), Loquenz et al.
patent: 4902381 (1990-02-01), Meredith
patent: 5034095 (1991-07-01), Kido et al.
patent: 5106456 (1992-04-01), Voitto et al.
Greenwood Brian
Henricson Kaj
A. Ahlstrom Corporation
Alvo Steven
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