Continuous cooking with reduced horsepower and pulp degradation

Details Continuous cooking with reduced horsepower and pulp degradation Continuous cooking with reduced horsepower and pulp degradation

1991-10-09

1993-08-17

Jones, W. Gary

Paper making and fiber liberation

Apparatus

Digester

162239, 162242, 162246, 162249, 162251, 162 19, 162 39, 162 40, D21C 100, D21C 700

Patent

active

052365530

ABSTRACT:
In the continuous cooking of comminuted cellulosic fibrous material (e.g. wood chips) to produce paper pulp, the material passes upwardly in an impregnation vessel which is within and concentric with a continuous digester and open at the top to digester pressure. At the top of the impregnation vessel, a solids/liquid separator (a screw within a screen cylinder) is provided. Separated liquid is returned in a conduit adjacent the exterior of the impregnation vessel, and open at the top to digester pressure, and passes out the bottom of the digester. The impregnation vessel is welded to the bottom of the digester, and the bottom of the digester is generally hemi-spherical, and substantially devoid of packings.

REFERENCES:
patent: 1905731 (1933-04-01), McKee
patent: 1933017 (1933-10-01), Jansa et al.
patent: 3138947 (1964-06-01), Johansen
patent: 3471366 (1969-10-01), Reinhall
patent: 3802956 (1974-04-01), Backlund
patent: 3902962 (1975-09-01), Reinhall
patent: 3928899 (1967-01-01), Laakso
patent: 4071399 (1978-01-01), Prough
patent: 4093511 (1978-06-01), Richter
The History of Kamyr Continuous Cooking, by Johan Richter, 1981.

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