EP 0407371 A2 19910109 - Continuous cooking with reduced cost, horsepower and pulp degradation.
Title (en)
Continuous cooking with reduced cost, horsepower and pulp degradation.
Title (de)
Kontinuierliches Kochen mit verminderten Kosten, weniger Energieverbrauch und Zellstoffabbau.
Title (fr)
Cuisson en continu à coût, consommation d'énergie et dégradation de pâte réduits.
Publication
Application
Priority
US 37265089 A 19890628
Abstract (en)
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 (34) which is within and concentric with a continuous digester (32) and open at the top to digester pressure. At the top of the impregnation vessel, a solids/liquid separator (36) (a screw (37) within a screen cylinder (38)) is provided. Separated liquid is returned in a conduit (41) 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 (35) of the digester, and the bottom of the digester is generally hemi-spherical, and substantially devoid of packings.
IPC 1-7
IPC 8 full level
D21C 3/00 (2006.01); D21C 7/00 (2006.01); D21C 7/14 (2006.01)
CPC (source: EP)
Designated contracting state (EPC)
AT DE FR
DOCDB simple family (publication)
EP 0407371 A2 19910109; EP 0407371 A3 19911127; BR 9003023 A 19910820; DE 407371 T1 19911017; FI 903207 A0 19900626; JP H0333287 A 19910213; NO 902849 D0 19900627; NO 902849 L 19910102; SE 506456 C2 19971215; SE 9001782 D0 19900517; SE 9001782 L 19901229
DOCDB simple family (application)
EP 90890180 A 19900607; BR 9003023 A 19900628; DE 90890180 T 19900607; FI 903207 A 19900626; JP 16117390 A 19900619; NO 902849 A 19900627; SE 9001782 A 19900517