Compositions – Absorptive – or bindive – and chemically yieldive
Patent
1980-11-18
1983-05-03
Gluck, Irwin
Compositions
Absorptive, or bindive, and chemically yieldive
423562, 423563, 423571, 423600, C01F 770, C01F 1300, C01B 1716, C01B 1722
Patent
active
043820115
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 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
patent: 4162299 (1979-07-01), Takeyama et al.
Bienstock et al., Process Development in Removing Sulfur Dioxide from Hot Flue Gases, Burio/Mines Inv. 5735, 1961.
Gluck Irwin
Kahn Evans
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