Method and device for the continuous cooking of pulp

Details Method and device for the continuous cooking of pulp Method and device for the continuous cooking of pulp

2009-08-06

2010-11-23

Halpern, Mark (Department: 1791)

Paper making and fiber liberation

Apparatus

Digester

Reexamination Certificate

active

07837834

ABSTRACT:
The continuous digester system has an inlet defined therein for the feed of a chips suspension and an outlet for the output of a cooked suspension of pulp. The suspension of chips is fed in to the inlet through a line at the beginning of the cook, where the chips suspension has a volume of starting cooking fluid that establishes a fluid/wood ratio that is greater than 3.5. A final cooking fluid is present during the cook for the major part of the cook and is withdrawn through a withdrawal strainer only during the final 15 minutes of the cook. The final cooking fluid ensures a fluid/wood ratio that is greater than 3.5 in association with the withdrawal. The withdrawn final cooking fluid during the final 15 minutes of the cook consists of spent black liquor that maintains a residual alkali level that lies under 15 g/l.

REFERENCES:
patent: 3475271 (1969-10-01), Laakso
patent: 3617431 (1971-11-01), Croon et al.
patent: 5885414 (1999-03-01), Lindstrom et al.
patent: 6241851 (2001-06-01), Marcoccia
patent: 7686919 (2010-03-01), Snekkenes et al.

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