Minimum adverse environmental pulp with feed to chlorate manufac

Details Minimum adverse environmental pulp with feed to chlorate manufac Minimum adverse environmental pulp with feed to chlorate manufac

1993-08-31

1995-08-08

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 29, 162DIG8, 423475, 423478, D21C 1100

Patent

active

054395550

ABSTRACT:
Liquid effluent from a pulp mill bleach plant having at least one chlorine chemical bleach stage is evaporated and then used in chlorate manufacture. The bleach plant effluent produced by evaporation may be stored and then transported to an off-site chlorate production location, and/or may be subjected to a sodium chloride removal process (such as evaporative crystallization) and only sodium chloride transported to the off-site location. Chlorates produced off site can be returned to the mill (with acid and caustic that are optionally produced) for chlorine dioxide manufacture on site. The chloride-depleted stream from sodium chloride removal may be burned in the mill recovery boiler.

REFERENCES:
patent: 4799994 (1989-01-01), Rimpi
patent: 5300191 (1994-04-01), Lindberg
Rapson et al. "The Effluent Free Bleached Kraft Pulp Mill . . . ", Tappi, vol. 56, No. 9, Sep. 1973, pp. 112-115.
Bertel Myreen, "Closing Up the Bleach Plant", Jun. 1991, pp. 1-4.
Reeve et al, "The Recovery of Sodium Chloride . . . ", Pulp and Paper Magazine of Canada, vol. 71, No. 13, Jul. 3, 1970, pp. 48-54.

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