Process for purge stream treatment in removal of sulfur dioxide

Details Process for purge stream treatment in removal of sulfur dioxide Process for purge stream treatment in removal of sulfur dioxide

1977-08-03

1979-12-04

Gantz, Delbert E.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423512A, C01B 1700, C01B 1745

Patent

active

041772440

ABSTRACT:
A process for treating the purge stream from an aqueous sodium sulfite/sodium bisulfite solution used in the removal (recovery) of sulfur dioxide from gas is provided wherein the purge stream is mixed with sodium hydroxide or sodium carbonate, the mix is cooled and sodium sulfite hydrate is crystallized and recycled for recovery of sulfur dioxide, and the residual mother liquor containing impurities is discarded.

REFERENCES:
patent: 3542511 (1970-11-01), Shah
patent: 3653812 (1972-04-01), Schneider et al.
patent: 3971844 (1976-07-01), Schneider
patent: 3989797 (1976-11-01), Brady
patent: 4003985 (1977-01-01), Hoffman et al.
Japanese Patent Application Ser. No. 696-1977, 7-16-1977.
Japanese Patent Application Ser. No. 149008, 8-3-1976.

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