Pulping lignocellulose in continuous pressurized batch digesters

Details Pulping lignocellulose in continuous pressurized batch digesters Pulping lignocellulose in continuous pressurized batch digesters

1979-07-25

1980-12-02

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Charging and/or discharging fibrous material

162 47, 162 61, 162241, D21C 706, D21C 712, C21C 714

Patent

active

042369614

ABSTRACT:
Lignocellulose is pulped batchwise by introducing it and the white liquor in predetermined quantity, together with a variable quantity of black liquor, into a continuously steam pressurized digester. When the cooking cycle has been completed, the pulp product is withdrawn. The time intervals of feed material introduction and pulp product withdrawal are correlated to insure that all of the lignocellulose charged to the digester is cooked uniformly, as by withdrawing the pulp product over a time interval which is substantially equal to the feed time. For economy and efficiency of operation, the digester preferably is operated in conjunction with one or more companion digesters to which it is connected. The first digester then is blown while a second digester is charged, making possible transfer of hot pressurized black liquor from the former to the latter.

REFERENCES:
patent: 2583994 (1952-01-01), Briggs
patent: 2824800 (1958-02-01), Rosenblad
patent: 2849315 (1958-08-01), Haglund
patent: 2938824 (1960-05-01), Richter
patent: 3434920 (1969-03-01), Green
patent: 3607620 (1971-09-01), Carlsmith

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