Patent ID: 6531104
Filing Date: 2003-03-11
Classification: B01D

Abstract:
A process for treating a gas containing sulfur oxides for the removal of said sulfur oxides comprising the steps of:(a) passing said gas containing said sulfur oxides upwardly in an absorber through a spray of aqueous ammonium sulfate solution passing downwardly in said absorber thereby forming a cleaned gas stream and an aqueous ammonium sulfate solution containing dissolved sulfur oxides; (b) conducting said aqueous ammonium sulfate solution containing dissolved sulfur oxides out from said absorber as it is formed; (c) collecting said aqueous ammonium sulfate solution containing dissolved sulfur oxide in a closed reaction tank; (d) introducing ammonia and an oxygen-containing gas into said aqueous ammonium sulfate solution in said closed reaction tank whereby said dissolved sulfur oxides react with said ammonia and oxygen to form ammonium sulfate and whereby a gaseous mixture containing ammonia is formed in said closed reaction tank; (e) withdrawing a first portion of said aqueous ammonium sulfate solution from said reaction tank and forming said spray of aqueous ammonium sulfate solution therefrom and withdrawing a second portion as ammonium sulfate product; (f) scrubbing said gaseous mixture containing ammonia from said reaction tank with water thereby removing ammonia from said gaseous mixture and forming an aqueous scrubber effluent containing dissolved ammonia and a remaining gaseous mixture; (g) introducing said aqueous scrubber effluent containing dissolved ammonia back into said reaction tank; and (h) introducing said remaining gaseous mixture into said absorber.