Method for bleaching pulp with chlorine dioxide

Details Method for bleaching pulp with chlorine dioxide Method for bleaching pulp with chlorine dioxide

D - Textiles, Paper

21

C

D21C 9/14 (2006.01) D21C 9/02 (2006.01)

Patent

CA 2382866

A method of treating pulp with chlorine dioxide according to which clorine dioxide is mixed in the pulp and the mixture thus produced is fed into a treatment vessel (42) in which the chlorine dioxide treatment is carried out at a temperature of 40-90 °C and at a pH of 1.5-6.5. The pulp is discharged from the treatment vessel in a closed space straight to a chlorine dioxide stage washer (44) ensuring that no detrimental amounts of residual dioxide remain in the pulp flowing to the washer.

L'invention porte sur un procédé de traitement de la pâte par du bioxyde de chlore consistant à le mélanger à la pâte puis à placer le mélange dans une cuve (42) où le traitement s'effectue entre 40 et 90 DEG C et à un pH de 1,5 à 6,5. La pâte est ensuite versée dans un récipient clos contigu à l'étage de lavage (44) du bioxyde de manière à assurer que la pâte passant dans le laveur ne contient pas de restes de bioxyde.

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