Process for isothermal cooking pulp in a continuous digester

Details Process for isothermal cooking pulp in a continuous digester Process for isothermal cooking pulp in a continuous digester

1996-08-13

1998-06-16

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 61, 162249, D21C 714, D21C 712

Patent

active

057664137

ABSTRACT:
The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one digester screening arrangement (1D) between the top and the bottom of the digester, and fibre material is fed out from the bottom (1C) of the digester, wherein the digester (1) is fitted with an additional digester screening arrangement (2) located at less than about 1.5 meters above the lowest screening arrangement (1B) of the digester so that the temperature in all the participatory cooking zones in the digester can be kept at essentially the same temperature level.

REFERENCES:
patent: 3298899 (1967-01-01), Laakso
patent: 3802956 (1974-04-01), Backlund
patent: 5069752 (1991-12-01), Richter
patent: 5236554 (1993-08-01), Greenwood
patent: 5567280 (1996-10-01), Backlund et al.
Kamyr Drawing 0-0701-1R 32, Jan. 2, 1968.
Ake Backlund, "Extended Delig. of Softwood . . . Digester", TAPPI Journal, Nov. 1984, pp. 62-65.

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