Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1994-12-14
1997-07-22
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 17, 162242, 162236, D21C 326, D21C 700
Patent
active
056500459
ABSTRACT:
A continuous pulp digesting apparatus where wood chips and a cooking liquor are directed into a first cooking zone, and a portion of the cooking liquor is extracted at an intermediate region downstream, of said first cooking zone. Fresh liquor is introduced into said intermediate region to adjust pH level to inhibit scaling and/or clogging of strainers in the digester, and further digesting is accomplished in a second cooking zone downstream of an intermediate region. Liquor is extracted through strainers at a lower location of said second cooking zone.
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Czaja Donald E.
Hughes Robert B.
Padgett Calvin
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