Bleaching of kraft cellulosic pulp employing ozone and reduced c

Details Bleaching of kraft cellulosic pulp employing ozone and reduced c Bleaching of kraft cellulosic pulp employing ozone and reduced c

1993-10-18

1995-02-14

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With agitation or forced circulation

162 65, 162 89, D21C 912, D21C 9147, D21C 9153

Patent

active

053892011

ABSTRACT:
In a multi-stage bleaching sequence for kraft pulps employing a chlorine-containing bleaching agent in the first and final stages thereof and an intermediate alkaline extraction stage, the improvement for enhancing the brightness of the pulp and reducing the quantity of dioxin or chlorinated organics comprising contacting the pulp, in a mixer, at an acidic pH and a temperature of below about 60.degree. C. with a mixture of ozone and oxygen at a pressure of between about 60 and 80 psig wherein the quantity of ozone introduced to the pulp is between about 0.2% and about 0.4%, based on pulp.

REFERENCES:
patent: 2466633 (1949-04-01), Brabender et al.
patent: 4278496 (1981-07-01), Fritzvold
patent: 4372812 (1983-02-01), Phillips et al.
patent: 4959124 (1990-09-01), Tsai
Degradation of Residual Lignin In Kraft Pulp With Ozone; Application to Bleaching: D. Lachenal and M. Muguet, 6th International Symposium of Wood and Pulping Conference; Apr. 28, 1991.
H. Sixta, G. Gotzinger, A. Schrittwieser and P. Hendel, Medium Consistency Ozone Bleaching: Laboratory and Mill Experience 45 Jahrgang. Heft 10.1991.
Perkins "Advances In Ozone Bleaching, Part III"; pp. 263-266.

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