Method of removing sulfur dioxide from flue gases

Abstract From the Canadian patent

Abstract of the Disclosure, The sulfur dioxide containing fue gases are passed through a gas scrubber containing an aqueous solution of a metal salt which can be reduced by sulfur dioxide from a high valence state to a lower valence state. This oxidizes the sulfur dioxide to either sulfur trioxide or sulfuric acid which dissolves in the solution. The sulfur compound containing solution is removed from the first gas scrubber and placed in a regeneration gas scrubber through which air is passed. The oxygen in the air oxidizes the reduced metal salt and thereby regenerates the solution to its original composition. The regenerated solution is then recycled to the first gas scrubber where …