Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Charging and/or discharging fibrous material
Patent
1998-04-21
2000-08-22
Fiorilla, Christopher A.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Charging and/or discharging fibrous material
162 56, D21C 110, D21C 706
Patent
active
061066680
ABSTRACT:
A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device conventionally used in the prior art. Instead of a high pressure transfer device the steamed and slurried chips are pressurized using one or more slurry pumps located at least thirty feet below the top of the treatment vessel and for pressurizing the slurry to a pressure of at least about 10 bar gauge. A return line from the top of the digester may, but need not necessarily, be operatively connected to the one or more pumps and if connected to the pumps the pressure in the return line may be reduced utilizing a pressure reduction valve and/or a flash tank. During pressurized transferring of the slurry from the pumps to a treatment vessel (which may be as little about 10 feet or as much as about a half a mile away) treatment liquid is provided which contains at least some active pumping chemical including sodium hydroxide, sodium sulfide; polysulfide, anthraquinone or their equivalents or derivatives; surfactants, enzymes, or chelants; or combinations thereof. Pseudo-countercurrent circulation of treatment liquids may be provided between stations.
REFERENCES:
patent: 4370172 (1983-01-01), Gueissaz
patent: 5164042 (1992-11-01), Lrsen et al.
patent: 5277760 (1994-01-01), Fongen
patent: 5476572 (1995-12-01), Prough
patent: 5500083 (1996-03-01), Johanson
Chamblee J. W.
Funk Erwin D.
Marcoccia Bruno S.
Ryham Rolf C.
Stromberg C. Bertil
Ahlstrom Machinery Inc.
Fiorilla Christopher A.
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