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1. AU1995018268 - Method for optimizing the liquor-to-wood ratio when producing paper pulp

Office
Australie
Numéro de la demande 18268/95
Date de la demande 03.02.1995
Numéro de publication 1995018268
Date de publication 12.10.1995
Type de publication A
CIB
D21C 3/24
DTEXTILES; PAPIER
21FABRICATION DU PAPIER; PRODUCTION DE LA CELLULOSE
CPRODUCTION DE LA CELLULOSE PAR ÉLIMINATION DES SUBSTANCES NON CELLULOSIQUES DES MATIÈRES CONTENANT DE LA CELLULOSE; RÉGÉNÉRATION DES LIQUEURS NOIRES; APPAREILS À CET EFFET
3Réduction en pâte des matières contenant de la cellulose
22Autres caractéristiques des procédés de réduction en pâte
24Procédés continus
D21C 1/00
DTEXTILES; PAPIER
21FABRICATION DU PAPIER; PRODUCTION DE LA CELLULOSE
CPRODUCTION DE LA CELLULOSE PAR ÉLIMINATION DES SUBSTANCES NON CELLULOSIQUES DES MATIÈRES CONTENANT DE LA CELLULOSE; RÉGÉNÉRATION DES LIQUEURS NOIRES; APPAREILS À CET EFFET
1Traitement préalable des matériaux finement divisés avant la cuisson
CPC
D21C 1/00
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
1Pretreatment of the finely-divided materials before digesting
D21C 3/24
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
3Pulping cellulose-containing materials
22Other features of pulping processes
24Continuous processes
Déposants Kvaerner Pulping Technologies AB
Inventeurs Aspvik, Alf
Berg, Staffan
Outzen, Peter
Données relatives à la priorité 9400433 10.02.1994 SE
Titre
(EN) Method for optimizing the liquor-to-wood ratio when producing paper pulp
Abrégé
(EN) The present invention relates to a method for optimizing the liquor-to-wood ratio, especially in a pre-impregnation vessel and a continuous digester, when producing chemical pulp. The method is based on a transfer circulation with the aid of which chips are transported from the said pre-impregnation vessel (2) through an input conduit (9) to the said digester (1). The principle is that chips are conveyed from a feeding-out device (5) at the bottom of the pre-impregnation vessel to the top separator (7) of the digester, together with circulation liquor. A part of the liquor is separated off in the said top separator (7) and the remainder in a screen section (8) lower down in the digester, in order subsequently to be returned through a return conduit (11, 12) to the feeding-out device (5) of the pre-impregnation vessel via a pump (4) and a heating device (3). A constituent stream in a conduit (13) is drawn off from the return conduit (11, 12), at a location upstream of the heating device (3), and is conveyed preferably to the upper part of the pre-impregnation vessel (2), so that the liquor-to-wood ratio in the said pre-impregnation vessel can be increased at the same time as the liquor-to-wood ratio in the upper part of the digester (1) can be decreased.
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