Method of bleaching pulp with chlorine-free chemicals

Details Method of bleaching pulp with chlorine-free chemicals Method of bleaching pulp with chlorine-free chemicals

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 9/02 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2157109

Kraft pulp is bleached to an acceptable brightness (e.g. 86 ISO or more) without using chlorinated organic compounds, yet the strength of the produced pulp remains commercially acceptable. In the manufacture of pulp, the pulp which is cooked and oxygen delignified to a kappa number of 14 or less, and then is bleached with ozone at a medium consistency. After the ozone treatment, heavy metals are removed from the pulp, and then the pulp is led to oxygen and/or peroxide treatment, which is followed by a second ozone bleaching stage. The sequence (ZT) (EOP) (ZP) is preferred.

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