Method for discharging a digester

Details Method for discharging a digester Method for discharging a digester

1990-09-26

1992-05-26

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Charging and/or discharging fibrous material

162246, D21C 708

Patent

active

051164752

ABSTRACT:
A method for discharging cooked lignocellulose materials from a digester is disclosed. After batch cooking the lignocellulose material in the digester is cooled to a temperature of about 100.degree. C., preferably from 100.degree. to 120.degree. C., a gas is supplied to the upper portion of the digester to provide a gas pressure such that the combination of that gas pressure and the static pressure in the digester created by the height of cooked lignocellulose material therein exceeds by no greater than about 200 kPa the sum of the pressure required to overcome the level difference between the exit port at the bottom of the digester and an entrance port in the upper portion of a receiving vessel and the flow resistance required to transfer the cooked lignocellulose material therethrough.

REFERENCES:
patent: 1977379 (1964-10-01), Dunbar
patent: 3486516 (1969-12-01), Stoertz
patent: 4105494 (1978-08-01), Pettersson
patent: 4814042 (1989-03-01), MacLeod

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