Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1978-05-18
1980-09-16
Thomas, Earl C.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423245, 423243, 423567A, 423569, 252184, 2521883R, 252191, 210683, B01D 5334
Patent
active
042229910
ABSTRACT:
A process for removing SO.sub.x pollutants from a stack gas by (1) absorbing the SO.sub.x pollutants with an aqueous absorbent containing a formate compound and (2) regenerating the spent absorbent containing dissolved SO.sub.x 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 an aqueous absorbent of an iron(II) chelate, such as a chelate of ferrous ion with ethylenediaminetetraacetic acid. Regeneration of spent absorbent containing absorbed NO is accomplished under the same conditions as for spent absorbents containing absorbed SO.sub.x compounds. SO.sub.x and NO pollutants dissolved in the absorbent are, during regeneration, converted to sulfur and nitrogen without the discharge of waste solids.
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Sandford Dean
Thomas Earl C.
Union Oil Company of California
Wirzbicki Gregory F.
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