Process for the desulfurization of flue gases

Details Process for the desulfurization of flue gases Process for the desulfurization of flue gases

1978-05-09

1980-05-13

Mack, John H.

Chemistry of inorganic compounds

Sulfur or compound thereof

Binary compound

423571, 423600, C01B 1716, C01B 1702, C01F 702

Patent

active

042028698

ABSTRACT:
Flue gas having a content of sulfur dioxide is passed upwardly through a scrubbing tower against a descending flow of recycled aqueous sodium aluminate-sodium hydroxide liquor. The sulfur dioxide in the gas is converted to sodium and aluminum sulfates and sulfites and the liquor removes any fly ash present in the gas. Underflow is continuously discharged from the tower and is sent to an evaporator for removal of excess water. Make-up solutions of sodium hydroxide, sodium sulfate and aluminum sulfate are added, as necessary. Carbonaceous reducing agent is added to the discharge from the evaporator. The mixture is continuously fed into a reducing furnace where the sulfates and sulfites are reduced to sulfides. The product of the furnace (molten sodium and aluminum sulfides) is charged into a continuous hydrolyzer. Hydrogen sulfide is evolved and collected, and, if desired, its sulfur content is converted to elementary sulfur. The underflow from the hydrolyzer is filtered. The filtrate is aqueous sodium aluminate-sodium hydroxide solution which is recycled to the scrubbing tower.

REFERENCES:
patent: 3574545 (1971-04-01), Grantham
patent: 3635666 (1971-01-01), Fujioka
Bienstock et al., Process Development in Removing Sulfur Dioxide from Hot Flue Gases, Bureau of Mines Inv. 5735, 1961.

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