Bleaching of medium consistency pulp with ozone without high...

Details Bleaching of medium consistency pulp with ozone without high... Bleaching of medium consistency pulp with ozone without high...

D - Textiles, Paper

21

C

D21C 9/153 (2006.01)

Patent

CA 2341490

A method for bleaching medium consistency pulp with an ozone-containing gas is disclosed. The highly concentrated ozone-carrying stream is introduced into the pulp stream without mechanical mixing, or accompanied by mixing of moderate intensity. Thus, advance is taken by the rapid reaction of ozone in plug-flow conditions without the use of fiber-destroying shear forces.

Cette invention se rapporte à un procédé de blanchiment de pâte à papier de consistance moyenne à l'aide d'un gaz contenant de l'ozone. A cet effet, le courant porteur d'ozone fortement concentré est introduit dans le courant de pâte à papier sans mélange mécanique, ou alors accompagné par un mélange d'intensité modérée. On obtient ainsi un gain grâce à la réaction rapide de l'ozone dans des conditions d'écoulement avec effet bouchon, sans l'utilisation de forces de cisaillement détruisant les fibres.

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