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1. (WO1979000861) A METHOD OF REFINING CELLULOSE PULPS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000861 International Application No.: PCT/SE1979/000073
Publication Date: 01.11.1979 International Filing Date: 29.03.1979
IPC:
D21C 9/00 (2006.01) ,D21C 9/10 (2006.01)
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10
Bleaching
Applicants:
Inventors:
Priority Data:
780367431.03.1978SE
Title (EN) A METHOD OF REFINING CELLULOSE PULPS
(FR) METHODE DE RAFFINAGE DE PULPE CELLULOSIQUE
Abstract:
(EN) A method of refining cellulose pulps by bleaching or extraction is disclosed, in which the pulps at a consistency of 10 - 65% and in a finely divided form are treated with chemicals at a temperature of 10 to 250 C. The finely divided pulp is fed, impregnated with chemicals and at a consistency of 30 to 65% continuously into a processing apparatus in which an excess system pressure of 5 to 400 kPa prevails and which includes an atmosphere substantially consisting of steam having an oxygen content of less than 1% by volume and a temperature of 100 to 150 C. The pulp is moved rapidly, but without alteration of its fibre characteristics, continuously through the processing apparatus under a substantially turbulent flow and with substantially unaltered solids content. The chemicals charged to the pulp are caused to react so completely with the pulp during its rapid movement through the processing apparatus that they are substantially consumed when the movement is terminated. The pulp is then discharged from the processing apparatus and dried, optionally after further chemical treatment steps.
(FR) Methode de raffinage de pate cellulosique par blanchiment ou extraction, dans laquelle la pate ayant une consistance de 10-65% et etant finement divisee est traitee avec des produits chimiques a une temperature de 10 a 250 C. La pate finement divisee et impregnee de produits chimiques passe continuellement avec une consistance de 30 a 65% dans un appareil de traitement dans lequel regne une surpression de 5 a 400 kPa et dont l"atmosphere se compose substantiellement de vapeur ayant une teneur en oxygene inferieure a 1% en volume, a une temperature de 100 a 150 C. La pate circule rapidement, mais sans que les caracteristiques de sa fibre soient alterees, de maniere continue a travers l"appareil de traitement avec un ecoulement substantiellement turbulent et avec une teneur en solides substantiellement inchangee. Les produits chimiques impregnes dans la pate sont forces de reagir de maniere si complete avec la celle-ci pendant sa circulation rapide a travers l"appareil de traitement, qu"ils sont pratiquement consommes lorsque le mouvement de circulation prend fin. La pate est ensuite dechargee de l"appareil de traitement, puis sechee, d"autres phases de traitement chimique pouvant avoir lieu avant le sechage.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)