Method for ozone bleaching of cellulosic pulp at low consistency

Details Method for ozone bleaching of cellulosic pulp at low consistency Method for ozone bleaching of cellulosic pulp at low consistency

1996-09-27

1998-12-29

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 88, D21C 914, D21C 9153

Patent

active

058535365

ABSTRACT:
A method of bleaching a pulp at low consistency employs chlorine dioxide and/or chlorine, to partially bleach the pulp. The aqueous partially bleached pulp flows along a sinuous flow path providing a high ratio of flow path of aqueous pulp to length of effective travel of the aqueous pulp. Ozone is introduced to the aqueous pulp at spaced apart locations in the flow path so that a low partial pressure of ozone is established in the flow path which favors chemical oxidation of the lignin and low chemical attack on cellulose. In this way effective bleaching is achieved with reduced use of chlorine or chlorine dioxide and reduced production of chlorinated compounds.

REFERENCES:
patent: 4198266 (1980-04-01), Kirk et al.
patent: 4959124 (1990-09-01), Tsai
Liebergott et al, "A Survey of the Use of Ozone in Bleaching Pulps, Part 1", Ozone Bleaching, TAPPI Journal, Jan. 1992, pp. 145-151.
Liebergott et al, "A Survey of the Use of Ozone in Bleaching Pulps, Part 2", Ozone Bleaching, TAPPI Journal, Feb. 1992, pp. 117-124.
Chirat et al, "Other Ways to Use Ozone in a Bleaching Sequence," TAPPI Proceedings, 1995 Pulping Conferrnce, pp. 415-419.
Lachenal et al, "Improvement in the Ozone Bleaching of Kraft Pulps," International Bleaching Conference, Stockholm, Sweden 1991.

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