Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1987-07-22
1989-05-30
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 40, 162 56, 162 65, 162 78, D21C 9147, D21C 916
Patent
active
048348376
ABSTRACT:
Method and apparatus for delignifying chemical pulp by means of oxygen, in which an aqueous slurry of chemical pulp is formed, then mixed with a caustic agent, followed by contact with a delignifying fluid. Water is drained off the slurry without reduction of pressure and while maintaining temperature following which the resulting slurry is maintained under these temperature and pressure conditions for a discrete period of time. The thus-obtained treated slurry is then washed.
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patent: 4196043 (1980-04-01), Singh
patent: 4259150 (1981-03-01), Prough
patent: 4298427 (1981-11-01), Bentvelzen et al.
patent: 4372812 (1983-02-01), Phillips et al.
Rydholm, "Pulping Processes", Interscience Publishers, N.Y., p. 336, Sep. 1967.
Fujii et al., "Oxygen Pulping of Hardwoods"; TAPII, Aug. 1978, vol. 61, No. 8, p. 37.
Hruschka Anton
Loquenz Heinz
Meindl Norbert
Meissl Siegfried
Schwarzl Karl
Alvo Steve
Steyrermuhl Papierfabriks-und-Verlags-Aktiengesellschaft
Waagner-Biro Aktiengessellschaft
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