Method for removing sulfur dioxide from exhaust gas

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

C - Chemistry, Metallurgy

01

B

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C01B 17/00 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01F 11/46 (2006.01)

Patent

CA 1091898

METHOD FOR REMOVING SULFUR DIOXIDE FROM EXHAUST GAS Abstract of the Disclosure The invention is a method for preventing the formation of scale in a system for the removal of sulfur dioxide from an exhaust gas. The system to which the invention relates comprises contacting the exhaust gas with an aqueous solution containing an organic acid alkali metal or ammonium salt, blowing air or oxygen into the resulting solution, reacting the solution with calcium hydroxide or calcium carbonate to form a precipitate of calcium sulfate, filtering of the calcium sulfate and recycling the supernatant liquid for contact with the exhaust gas. The method of the invention comprises causing the solution to contain not less than 0.3 percent by weight of crystal- line calcium sulfate immediately prior to the contact with the exhaust gas and causing the concentration of alkali metal or ammonium sulfite in the aqueous solution to be less than 2 percent by weight immediately after the contact.

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