Removal of sulfur and nitrogen oxides from stack gases by ammonia.
Shale CC; Simpson DG; Lewis PS
Chem Eng Prog Symp Ser 1971 Jan; 67(115):52-58
Complete removal of sulfur dioxide and partial removal of nitrogen dioxide impurities from a simulated stack gas mixture were effected in laboratory experiments by vapor-phase reaction with ammonia. A cyclic process utilizing ammonia involves recovery of the chemical reaction products by condensation and regeneration of the feeds by thermal decomposition and reaction of acidic constituents with zinc oxide. Ammonia is separated for recycle, and essentially pure sulfur dioxide is recovered as a byproduct. Ash particles not removed by mechanical separation are trapped in the condensate. A flow diagram for commercial application of this conceptual process is discussed.
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