System for the oxygen delignification of pulp consisting of...

Details System for the oxygen delignification of pulp consisting of... System for the oxygen delignification of pulp consisting of...

D - Textiles, Paper

21

C

D21C 9/147 (2006.01)

Patent

CA 2374353

The invention relates to a system for the oxygen delignification, in at least two reaction stages, of pulp which consists of lignocellulose-containing material and whose mean concentration is 8-18% pulp consistency. The oxygen delignification takes place in a first reaction stage (6) in which an essentially constant and low pressure prevails during the whole of the delignification process, after which the second delignification stage (10), with a substantially higher pressure and temperature and a longer dwell time, begins. The invention is characterised in that the first reaction stage (6) consists of a pipe loop arranged to lie essentially in the same horizontal plane.

L'invention concerne un système de délignification à l'oxygène, dans au moins deux étages de réaction, de pâte constituée d'un matériau contenant de la lignocellulose et dont la concentration moyenne représente une consistance de la pâte de 8 à 18 %. La délignification à l'oxygène a lieu dans un premier étage de réaction (6) dans lequel une pression essentiellement constante et faible prévaut pendant tout le processus de délignification, après quoi commence le second étage de délignification (10), avec une pression et une température sensiblement plus élevées ainsi qu'un temps de contact plus long. L'invention est caractérisée en ce que le premier étage de réaction (6) se compose d'une boucle de conduit agencée pour se trouver essentiellement dans le même plan horizontal.

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