| abstract |
A process for removing SOx pollutants from a stack gas by (1) absorbing the SOx pollutants into an aqueous absorbent containing a formate compound and (2) regenerating the spent absorbent containing dissolved SOx compounds by contact, in the presence of added formate anion, with a water-insoluble, solid substance containing one or more tertiary amine functional groups. Nitrogen monoxide is removed by providing in the aqueous absorbent an iron(II) chelate, such as a chelate of ferrous ion with ethylenediaminetetraacetic acid. Regeneration of the spent absorbent containing absorbed NO is accomplished under the same conditions as for spent absorbents containing absorbed SOx compounds. SOx and NO pollutants dissolved in the absorbent are, during regeneration, converted to hydrogen sulfide and nitrogen, respectively. |