Bleaching of chemical pulp with peracid

Details Bleaching of chemical pulp with peracid Bleaching of chemical pulp with peracid

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21H 21/32 (2006.01)

Patent

CA 2315063

The invention relates to a process for the bleaching of chemical pulp and the use of a bleaching solution. According to the invention the pulp is treated in a plurality of different steps by using at least in one step a bleaching solution which contains a peracid, and the essential idea of the invention is that the peracid is used in a post-bleaching which is the last step of the bleaching process, the post bleaching being carried out in the presence of one or more earth-alkali metal compounds. By using a peracid the pulp is brought to its final brightness, and the purpose of the earth-alkali metal added is to combat the lowering of the viscosity of the pulp. According to the invention the post-bleaching can be carried out after the bleach plant steps in a pulp flow pipe, a storage tower or in the paper machine at a paper mill.

L'invention concerne un procédé de blanchiment de pâte chimique et l'utilisation d'une solution de blanchiment. Selon cette invention, plusieurs opérations différentes permettent de traiter la pâte, l'une de ces opérations au moins utilisant une solution de blanchiment contenant un peracide. Le principe de base de cette invention réside dans l'utilisation du peracide dans le post-blanchiment, dernière opération du processus de blanchiment. Le post-blanchiment est réalisé en la présence d'un ou de plusieurs composés de métal alcalino-terreux. L'utilisation d'un peracide permet de donner à la pâte sa blancheur finale, l'ajout du métal alcalino-terreux servant à combattre la diminution de la viscosité de la pâte. Selon l'invention, le post-blanchiment peut être réalisé après les opérations de blanchiment dans un tuyau d'écoulement de pâte, dans une tour de stockage ou dans une machine à papier d'une papeterie.

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