Ambient temperature pulp bleaching with peroxyacid salts

Details Ambient temperature pulp bleaching with peroxyacid salts Ambient temperature pulp bleaching with peroxyacid salts

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21C 3/26 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2219759

The present invention relates to a Kraft pulp bleaching stage which is to be carried out after conventional bleaching stages to high brightness. It has been discovered that ambient-temperature blaching with inorganic peroxyacid salts, such as peroxymonosulfates, at this point can provide substantial increases in pulp brightness without significant decreases in pulp viscosity. Peroxyacid bleaching according to the present invention is carried out at ambient temperature and no greater than about 40 ~C and at an initial pH that is slightly alkaline and preferably about 7.25.

L'invention concerne une phase de blanchiment de la pâte kraft exécutée après les phases de blanchiment classiques et permettant d'obtenir un degré de blancheur élevé. On a découvert que le blanchiment à la température ambiante au moyen de sels de péroxyacide inorganiques, tels que des péroxymonosulfates, peut augmenter sensiblement le degré de blancheur sans réduire considérablement la viscosité de la pâte. Le blanchiment au péroxyacide selon l'invention s'effectue à la température ambiante et jusqu'à 40 ·C maximum, avec un pH initial légèrement alcalin, de préférence d'environ 7,25.

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