Improved ozone bleaching

Details Improved ozone bleaching Improved ozone bleaching

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2147244

A bleached pulp having a high viscosity for a given permanganate number is formed by pretreating never dried pulp with an organic solvent medium to produce a treated pulp composed of said never dried pulp in the medium and then bleaching that treated pulp using ozone at a pH of 1.5-5 to provide a bleached pulp while reducing the viscosity loss during the ozone bleaching step significantly compared to that what would occur if the medium used in the ozone bleaching were water.

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