Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1978-08-30
1980-06-10
Vertiz, O. R.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423182, 423512A, 423551, C01B 1700, C01D 306, C01B 1745, C01D 500
Patent
active
042072999
ABSTRACT:
Sodium sulfate is purged from a sulfur dioxide removal system involving contact of a sulfur dioxide-containing gas with a solution containing sodium sulfite to absorb sulfur dioxide from the gas. The spent absorbing solution is regenerated by desorbing sulfur dioxide, and recycled for further use. To avoid an unduly large build-up of sulfate in the system, a portion of the absorbing-desorbing medium, e.g., spent absorbing solution, containing sodium sulfate, a relatively large amount of sodium bisulfite, and generally a minor amount of sodium sulfite, is treated to precipitate solids containing sodium sulfate in a concentration which is greater on a dry basis than would otherwise be obtained in the absorption-desorption cycle. The concentration of sodium sulfate in the precipitated solids is increased by providing a portion of the precipitated sodium sulfate-containing solids, e.g. about 25 to 75 weight percent, in solution in the absorbing-desorbing medium treated for sulfate removal. Preferably, sulfate removal is accomplished by reducing the amount of water in the portion of the absorbing-desorbing medium treated so that only sufficient solids are precipitated from said medium to comprise up to about 10, or up to about 20, weight percent of the medium.
REFERENCES:
patent: 3971844 (1976-07-01), Schneider
"Design" Saemen, Industrial & Engineering Chemistry, 1961 , pp. 617, 620.
Davy Powergas Inc.
Heller Gregory A.
Vertiz O. R.
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