Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1985-06-24
1987-11-10
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
68181R, 162 37, 162 40, 162 47, 162 60, 162 89, D21C 902, D21C 904
Patent
active
047056002
ABSTRACT:
A method for the treatment of a suspension, such as pulp, with one or more treatment liquids in a manner that maximizes treatment efficiency and minimizes heat loss. The pulp flows in a flow path confined to a given web thickness, and has first and second opposite sides. Treatment liquid is added to the first side of the flow path at spaced predetermined points along its length. Liquid displaced by the treatment liquid is withdrawn from the second side of the flow path at substantially the predetermined points. The displaced liquid at the first predetermined point along the flow path consists essentially of original suspension liquid, while the liquid fraction of the pulp past the last predetermined point of the flow path is composed mainly of treatment liquid added at the last predetermined point. Treatment can be accomplished at super-atmospheric pressure and at a temperature above 100.degree. C. The web thickness is between about 50-500 mm., and the pulp concentration is between about 7-15 percent and is maintained substantially constant throughout treatment.
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Gullichsen, "Displacement Bleaching-Past, Present, Future", Tappi, Dec. 1979, vol. 62, No. 12.
Kamyr, Publication "Displacement Bleaching", Jan. 1978.
Alvo Steve
Kamyr AB
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