Process for removing so.sub.2 from effluent gases and for removing heat stable salts from systems in which they accumulate using an anion exchange resin

Abstract From the Canadian patent

Improvement in processes for the selective removal of sulfur dioxide with respect to carbon dioxide from a gas mixture containing same wherein the gas mixture is contacted with an aqueous absorbent solution such as, alkanolamine, alkali metal hydroxide ammonium hydroxide, or sulfites thereof to remove sulfur dioxide from the gas, mixture and form a SO2-rich aqueous absorbent solution which is moved to a stripping zone where sulfur dioxide is driven off to form a SO2-depleted aqueous absorbent solution which is recycled and re-contacted with the gas mixture, the improvement comprising removing sulfur oxyanions of heat stable salts which accumulate in the aqueous absorbent solution by …