Process for the chlorine-free bleaching of cellulosic materials

Details Process for the chlorine-free bleaching of cellulosic materials Process for the chlorine-free bleaching of cellulosic materials

D - Textiles, Paper

21

C

8/82

D21C 9/153 (2006.01) D21H 17/00 (2006.01)

Patent

CA 2028788

A process for the chlorine-free bleaching of pulps in an aqueous suspension which comprises forming the suspension with a consistency of 3 to 20 mass percent; introducing into the suspension an ozone- containing gas having an ozone content of 20 to 300 g/m3 in an amount corresponding to at most 2 mass percent ozone calculated on dry pulps of the suspension during vigorous agitation of the suspension to form a reaction mixture; maintaining a pressure of the ozone-containing gas at a pressure of 1 to 15 bar during introduction into the suspension; and controlling reaction conditions during contact of the ozone-containing gas with the suspension to maintain a reaction temperature of 15° to 80°C and a pH value of 1 to 8.

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