A method for oxygen delignification of cellulose pulp at...

D - Textiles – Paper – 21 – C

Patent

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D21C 9/147 (2006.01)

Patent

CA 2553539

The invention relates to a method for the improved oxygen delignification of cellulose pulp with a medium consistency of 8-16 %. The fraction of dissolved oxygen can be maintained at a high level throughout the process by the use of high pressure, greater than 15.0 bar, and by repeated agitative mixing while maintaining the high pressure, such that as large a fraction as just over 20% of the total oxygen added is dissolved in the fluid phase, and such that the amount of oxygen in the fluid phase is maintained at a high level throughout the complete high pressure section. By the establishment of retention times between the remixing operations with successively increasing retention times, while retaining a high pressure, an optimal adaptation of the remixing is obtained at the time at which a certain fraction of the oxygen dissolved in the fluid phase has been consumed. This means that the amount of oxygen that is dissolved in the fluid phase and that penetrates the cellulose fibres can be maintained at an optimal high level throughout the process for improved delignification of the cellulose.

L'invention concerne un procédé de délignification améliorée à l'oxygène de pâte de cellulose, selon une cohérence moyenne comprise entre 8 et 16 %. La fraction d'oxygène dissous peut être maintenue à un niveau élevé durant l'ensemble du procédé, par haute pression (plus de 15 bar), et grâce à un brassage répété durant lequel on maintient cette haute pression. Ainsi, on dissout en phase liquide une fraction qui peut atteindre un peu plus de 20 % de l'oxygène total ajouté, avec maintien de la quantité d'oxygène dans ladite phase à un niveau élevé sur tout l'étage haute pression. En établissant des temps de rétention entre les opérations de brassage répétées et en augmentant successivement ces temps, avec maintien de la haute pression, on assure une adaptation optimale des opérations de brassage répétées lorsqu'une certaine fraction de l'oxygène dissous en phase liquide a été consommée. Ainsi, la quantité d'oxygène dissous en phase liquide et pénétrant dans les fibres de cellulose peut être maintenue à un niveau optimal élevé sur l'ensemble du procédé considéré.

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