Treatment vessel for straw or other light bulky material

Details Treatment vessel for straw or other light bulky material Treatment vessel for straw or other light bulky material

2011-08-02

2011-08-02

Daniels, Matthew J (Department: 1741)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Particular raw cellulosic materials

C162S094000, C162S096000, C162S097000, C162S098000, C162S243000

Reexamination Certificate

active

07988822

ABSTRACT:
A method to chemically treat light weight, bulky cellulosic material including: introducing the material to an upper inlet of a substantially vertical treatment vessel; maintaining the material in the vessel at a pressure of at least 20 bar and at a temperature of at least 200° C.; treating the material with a cooking liquor in the vessel; moving the material past at least one anti-compression ring on an inside surface of the vessel, as the material moves downward through the vessel; agitating the material in the vessel, and discharging the treated material from a lower discharge port of the vessel.

REFERENCES:
patent: 4028171 (1977-06-01), Richter
patent: 5985096 (1999-11-01), Marcoccia et al.
patent: 6280569 (2001-08-01), Sheerer
patent: 2003/0205343 (2003-11-01), Salminen
European Search Report for EP Application No. 08017207 (Jan. 28, 2009).

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