Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Reexamination Certificate
2005-01-11
2005-01-11
Alvo, Steve (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
C162S052000, C162S057000, C162S065000
Reexamination Certificate
active
06841036
ABSTRACT:
A system and process for the oxygen delignification of pulp consisting of a lignocellulose-containing material that has a mean concentration of 8-18% pulp consistency. The oxygen delignification takes place in a first stage with a short dwell time of about 3-6 minutes, at a low temperature of about 85° C. and under a low pressure of approximately 0-4 bar. A concluding stage has a longer dwell time of about 50-90 minutes, at a higher temperature of approximately 100° C. and under a higher pressure of about 8-10 bar.
REFERENCES:
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patent: 505 141 (1997-06-01), None
patent: WO 9630586 (1996-10-01), None
patent: WO 9715715 (1997-05-01), None
Perry, Chemical Engineers Handbook, McGraw-Hill Book Company, New York, 1963, p. 3-191.
Dahllof Hakan
Ragnar Martin
Alvo Steve
Fasth Rolf
Fasth Law Offices
Kvaerner Pulping AB
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