Method for removing sulfur dioxide from combustion exhaust gas

Details Method for removing sulfur dioxide from combustion exhaust gas Method for removing sulfur dioxide from combustion exhaust gas

1974-09-17

1976-06-01

Vertiz, Oscar R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423166, C01F 1146, B01D 5334

Patent

active

039610217

ABSTRACT:
Sulfur dioxide can be removed from a combustion exhaust gas and converted to gypsum by first scrubbing a sulfur dioxide-containing combustion exhaust gas with an aqueous alkali sulfite solution to form an alkali bisulfite-containing aqueous solution and then treating, within a closed system, the thus formed aqueous bisulfite solution with a calcium compound. The efficiency of the sulfur dioxide removal can be increased greatly by adding a portion of alkali sulfite aqueous solution circulating in the system to at least a portion of filtrate from the gypsum separation process to precipitate metallic ionic impurities contained in the filtrate in the form of salts and separate these salts by filtration, and then recirculating the filtrate from the salt separation process to the absorption system.

REFERENCES:
patent: 3485581 (1969-12-01), Miller et al.
patent: 3556722 (1971-01-01), Owaki
patent: 3775532 (1973-11-01), Shah
patent: 3840638 (1974-10-01), Morita et al.

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