Method of managing liquid steams in a pulp mill

Details Method of managing liquid steams in a pulp mill Method of managing liquid steams in a pulp mill

1993-03-02

1994-04-12

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 47, 162 31, 162189, 162DIG8, 162252, D21C 1100

Patent

active

053022467

ABSTRACT:
In minimizing effluents from a cellulose pulp mill, liquid effluents from a bleach plant are concentrated, and then incinerated to produce a residue including sodium, sulfate, and sodium chloride. This residue is distilled with sulfuric acid to produce gaseous hydrogen chloride and remaining residue, the HCl being used in chloride dioxide production for the bleach plant, while the remaining residue is passed to the recovery loop (e.g. recovery boiler). Sulfur containing gases from the non-condensible gas system may be combusted to produce gaseous sulfur dioxide, which is then converted to sulfuric acid, to distill the residue. Where a non-chlorine bleach plant is provided, the liquid effluents may be concentrated in evaporators and then passed directly to the recovery boiler. The liquid streams in the mill are managed by a cascade principle to reserve the cleanest water for only those processes where it is needed while minimizing its use where it is not necessary.

REFERENCES:
patent: 4039372 (1977-08-01), Reeve et al.
patent: 4096028 (1978-06-01), Rosenberger
patent: 4813237 (1989-03-01), Szucs
Hendrickson et al., "Process & Operation for Zero Effluent Discharge", Apr. 1974, TAPPI, vol. 57, No. 4, pp. 71-73.
Mils Mannbro, "Closed Cycle Recovery & Combustion of Bleachary Filtrate", Nordic Pulp & Paper Research Jour. No. 3/1990, pp. 134-141.
Bertel Myreen, "Closing Up the Bleach Plant", Jaakko Poyry.
"Production of Sulphuric Acid From Sulphurous Off-Gases by the Topsoe WSA-2 Process", Bendixen and Schoubye, Haldor Topsoe A/S pp. 1-13.
TBI Pulp and Paper Industry Applications Manual, "Measurement of Pulp Stock pH and Conductivity With TBI `Hot Tap` sensors", pp. i-13.

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