Removal of sulfur dioxide

Details Removal of sulfur dioxide Removal of sulfur dioxide

C - Chemistry, Metallurgy

25

B

23/349, 204/80,

C25B 1/22 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01B 17/74 (2006.01)

Patent

CA 1332372

ABSTRACT OF THE DISCLOSURE A process is disclosed for removing sulfur dioxide from a waste gas stream such as effluent vent of flue gas, for purposes of economy, for achieving a useful by-product, and for minimizing environmental pollution. The gas is scrubbed with an aqueous sulfuric acid stream to convert the sulfur dioxide to sulfurous acid. The acid stream containing the sulfurous acid is subjected to electrolysis to oxidize the sulfurous acid to sulfuric acid. The acid stream resulting from the electrolysis step is recycled to repeat the scrubbing and electrolysis steps in a continuous cycle, while maintaining the concentration of the acid stream by means of make-up water and acid.

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