Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With washing
Patent
1994-02-18
1998-07-28
Lamb, Brenda A.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With washing
162 65, D21C 902
Patent
active
057858101
ABSTRACT:
A system for dewatering/washing wood pulp and also for bleaching the same. Pulp from a digester is directed into a dewatering/washing apparatus which comprises a high pressure vessel in which there is a table assembly having a perforate support surface for receiving the pulp thereon. A pressure differential is applied across the table assembly so that liquid is removed from the pulp. Also, a processing chemical and/or compound for bleaching is directed into the pulp at a final stage in the washer so as to be retained in the pulp. The pulp is then directed to a pressurized processing vessel where the compound and/or chemical reacts with the pulp. The pulp so treated in the processing vessel is then directed through a second washing station where the pulp is dewatered and has a compound and/or chemical introduced thereon, after which the pulp is transmitted to a second pressure vessel. This process is continued until the bleaching process is completed.
REFERENCES:
patent: 4070234 (1978-01-01), Anderson et al.
patent: 4154644 (1979-05-01), Ericsoon
patent: 4303470 (1981-12-01), Weredith
patent: 4946556 (1990-08-01), Prough
patent: 4946881 (1990-08-01), Funk
patent: 4964733 (1990-10-01), Fridicksson et al.
The Bleaching of Pulp, Third Edition (1979), Tappi Press, Atlanta, GA. pp. 52, 197, 322, 404-406, 408-409, 525 and 531.
Hughes Robert B.
Lamb Brenda A.
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