D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/10 (2006.01) D21C 11/00 (2006.01)
Patent
CA 2275710
A method for the treatment of cellulose fibres in a pulp stream (22) comprises the following steps. A pulp is prepared (21). The pulp is subjected to a bleaching, comprising at least a bleaching step (25, 30) by the addition of an oxidizing bleaching agent. After the bleaching, liquid is removed (28, 33) from the pulp while obtaining a residue liquid and at least a part flow of the residue liquid obtained is conveyed back to the pulp stream (22) via a transport conduit by means of a pump device. Said part flow of the residue liquid is treated by oxygen (45) by the supply of oxygen to the part flow downstream of the pump device.
L'invention concerne un procédé de traitement de fibres cellulosiques contenues dans un flux de pâte (22), comprenant les étapes suivantes: Préparation (21) d'une pâte; blanchiment de cette pâte en au moins une opération de blanchiment (25, 30) par addition d'un agent de blanchiment oxydant; extraction (28, 33) du liquide contenu dans la pâte, ce qui donne un liquide résiduaire; renvoi d'au moins un flux partiel du liquide résiduaire ainsi obtenu dans le flux de pâte (22) par l'intermédiaire d'un conduit de transport au moyen d'un dispositif de pompage. Ce flux partiel de liquide résiduaire est traité à l'oxygène (45) par injection d'oxygène en aval du dispositif de pompage.
Bokstrom Monica
Hardmeier Peter
Jansson Bjorn
Petersson Martin
Tigerstrom Anna
Aga Aktiebolag
Ridout & Maybee Llp
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