Method of bleaching pulp with chlorine-free chemicals wherein a

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

1997-09-15

2000-01-04

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

162 65, 162 72, 162 76, 162 78, 162 90, D21C 9153, D21C 916

Patent

active

060105941

ABSTRACT:
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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patent: 5607545 (1997-03-01), Henricson et al.
Henricson et al, "New Generationm Kraft Pulping and Bleaching Technology", Apr. 1992.

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