Bleaching process for kraft pulp employing high consistency chlo

Details Bleaching process for kraft pulp employing high consistency chlo Bleaching process for kraft pulp employing high consistency chlo

1993-10-06

1998-08-11

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 66, 162 89, D21C 914, D21C 9153, D21C 916

Patent

active

057923167

ABSTRACT:
In the bleaching of kraft cellulosic pulps employing a stage in which the pulp is contacted simultaneously with gaseous chlorine and ozone, the improvement in which the pulp at a low to high consistency is initially chlorinated with hypochlorous acid and thereafter is contacted substantially simultaneously with gaseous chlorine and ozone. The pulp so processed exhibits enhanced brightness and good viscosity, and the process produces low quantities of environmentally undesirable chlorinated organics. The bleaching sequence of M(C+Z).sub.g ED is disclosed.

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patent: 4902381 (1990-02-01), Meredith
Hurst, "High Brigtness Pulp Bleaching with Monox-L"; 1988 Int. Pulp Bleach Conf; Orlando, Fla., Jun. 5-9 1988, pp. 99-106 (162-89).
Author: Marilyn M. Hurst, Title: "High Brightness Pulp Bleaching with Monox-L", Publication: 1988 Int. Pulp Bleach. Conf.; Orlando, Florida, Date: Jun. 5-9, 1988.

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