Method of removing sulfur-containing gases from waste gas

Details Method of removing sulfur-containing gases from waste gas Method of removing sulfur-containing gases from waste gas

B - Operations, Transporting

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B01D 53/34 (2006.01) B01D 53/50 (2006.01)

Patent

CA 1047739

METHOD OF REMOVING SULFUR-CONTAINING GASES FROM WASTE GAS ABSTRACT OF THE DISCLOSURE This process involves contacting a waste gas contain- ing an oxide of sulfur with an aqueous medium having a pH below 7.1 in an autoregenerative cyclic process using limestone in combination with carbon dioxide, an added amount of a soluble sulfate of a cation such as potassium, lithium, sodium, mag- nesium or ammonium or mixtures of these compounds to remove the oxides of sulfur. The soluble sulfates may be added directly to the aqueous medium or may be formed in situ from the known carbonate, bicarbonate, oxide, sulfite, bisulfite, or hydroxide of these cations or ammonia after reaction with the sulfur oxides in the waste gas. Sulfur is removed from the cycle in the form of insoluble calcium sulfite and calcium sulfate. -1-

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