Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Charging and/or discharging fibrous material
Reexamination Certificate
2007-03-19
2010-02-09
Halpern, Mark (Department: 1791)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Charging and/or discharging fibrous material
C162S041000, C162S042000, C162S236000, C162S246000
Reexamination Certificate
active
07658818
ABSTRACT:
A method for converting a vapor phase continuous digester to a hydraulic digester including the steps of: operating the vapor phase digester in a vapor phase mode wherein a chip slurry enters the vessel of the digester through a lower chip inlet port, moves up through a top separator, discharges from an upper chip discharge chute of the separator to an upper vapor region of the vessel and falls to a liquor filled region of the vessel; ceasing the flow of the chip slurry to the separator; establishing a chip slurry flow path to an upper portion of top separator, and filling the vessel with liquor and chips such that the chip discharge chute is immersed in liquor.
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Bolles John F.
Stromberg C. Bertil
Sullivan Patrick J.
Vogel Keith P.
Andritz Inc.
Halpern Mark
Nixon & Vanderhye P.C.
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