Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1977-10-12
1980-04-15
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 49, 162 57, 162 62, 162 65, D21C 302
Patent
active
041982665
ABSTRACT:
In a process for delignifying wood pulp with oxygen, a pulp slurry and oxygen are introduced into an elongated reactor having a plurality of gravitational fall zones at which oxygen is dissolved in the liquid phase of the slurry. The length of the reactor is sufficient to provide the residence time required for delignification reactions. Alkali is added in controlled quantities along the reactor length in response to sensed slurry pH to maintain a predetermined slurry pH throughout the reactor. The oxygen treated slurry discharged from the reactor is separated into pulp and hot recycle liquor, the latter being utilized to effect thermal, chemical and water economies.
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patent: 3754417 (1973-08-01), Jamieson
patent: 3826742 (1974-07-01), Kirk et al.
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patent: 3843473 (1974-10-01), Samuelson et al.
patent: 3941649 (1976-03-01), Wallin
patent: 3944463 (1976-03-01), Samuelson et al.
patent: 3951733 (1976-04-01), Phillips
TAPPI vol. 59, No. 11, 11/76, pp. 77-79.
Kirk Bradley S.
Kirschner Mark J.
Airco, Inc.
Bashore S. Leon
Bopp Edmund W.
Cassett Larry R.
Rae David L.
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