Chlorine dioxide generation for a zero discharge pulp mill

Details Chlorine dioxide generation for a zero discharge pulp mill Chlorine dioxide generation for a zero discharge pulp mill

1992-12-23

1994-04-05

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 29, 162 301, 162DIG8, 423475, 423478, 423DIG8, D21C 1112

Patent

active

053001915

ABSTRACT:
Chloride dioxide for a cellulose pulp mill bleach plant is produced by concentrating (evaporating) liquid effluents from the bleach plant to a concentration level high enough for incineration, incinerating the concentrated effluents to produce an ash, chemically reacting at least a part of the ash to produce chlorate, and using the chlorate in the manufacture of chlorine dioxide. The ash is purified to produce sodium chloride and the sodium chloride is reacted with oxygen and external energy to produce sodium chlorate. The chlorate is then used in the manufacture of chlorine dioxide. Sulfates produced are used to manufacture acid and/or caustic, and heavy metal hydroxides are disposed of. A part of the ash may be used directly in chlorine dioxide manufacture. At least some of the salt from chlorate manufacture may be fed to the chemical recovery loop, including a recovery boiler, in the pulp mill. Evaporated gases may be returned to the pulp mill and bleach plant.

REFERENCES:
patent: 4405418 (1983-09-01), Takemura
patent: 4678655 (1987-07-01), Twardowski
patent: 5116595 (1992-05-01), Scribner et al.
patent: 5145660 (1992-09-01), Wickstrom
Bertel Myreen, "Closing Up the Bleach Plant", Jun. 1991, pp. 1-4.
W. H. Rapson & D. W. Reeve, "The Effluent-Free Bleached Kraft Pulp Mill", TAPPI vol. 56, No. 9, Sep. 1973, pp. 112-115.

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