Impregnation of cellulose-containing material with black...

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 3/24 (2006.01) D21C 1/00 (2006.01)

Patent

CA 2217568

The present invention relates to a method for continuous cooking of kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips being conveyed from a high-pressure feeder (2) in a transfer line (2A, 4A) to a first end (3) of the digester (1), the chips being impregnated, in a liquid containing black liquor, in a concurrent impregnation zone (5), the chips being cooked in a cooking zone (6) subsequent to the impregnation zone, hot black liquor (7) being extracted from at least one extraction screen section (8), and cooked pulp being discharged (9) at the other end of the digester. The chips are, when they leave the high-pressure feeder (2), included in a first liquid, which first liquid is in the main separated from the chips in a liquid exchanger (4) installed in the transfer line (2A, 4A) and is replaced by a second liquid which contains black liquor.

Procédé de cuisson en continu de pâte kraft dans un système (1) à cuve unique, de préférence dans un lessiveur hydraulique à cuve unique. Les copeaux sont transférés d'un dispositif d'alimentation (2) à haute pression par une conduite de transfert (2A, 4A) vers une première extrémité (3) du lessiveur (1). Ils sont ensuite imprégnés, dans un liquide contenant de la liqueur noire, dans une zone d'imprégnation (5), puis ils sont cuits dans une zone de cuisson (6) en aval de la zone d'imprégnation, la liqueur noire chaude (7) étant extraite par au moins une partie (8) servant de tamis d'extraction et la pâte cuite étant évacuée (9) à l'autre extrémité du lessiveur. Lorsqu'ils quittent le dispositif d'alimentation, les copeaux sont introduits dans un premier liquide, ledit liquide étant pour l'essentiel séparé des copeaux dans un échangeur (4) de liquide installé dans la conduite de transfert (2A, 4A) et remplacé par un second liquide qui contient de la liqueur noire.

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