Chemistry of inorganic compounds – Nitrogen or compound thereof
Patent
1980-05-21
1983-02-08
Peters, G. O.
Chemistry of inorganic compounds
Nitrogen or compound thereof
423235, 423563, 210903, 210903, B01D 5336, C01B 2102
Patent
active
043729320
ABSTRACT:
A process for removing SO.sub.x pollutants from a stack gas by (1) absorbing the SO.sub.x pollutants into 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 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 SO.sub.x compounds. SO.sub.x and NO pollutants dissolved in the absorbent are, during regeneration, converted to hydrogen sulfide and nitrogen, respectively.
REFERENCES:
patent: 3397963 (1968-08-01), Wagner
patent: 4177140 (1979-12-01), Smakman
patent: 4222991 (1980-09-01), Hass
Wagner, K; "Angew. Chem. Internat. edit.", vol. 9, No. 1; 1920, pp. 50-54.
Awad, W. I. et al., "Talanta", vol. 18, No. 2, (1971), pp. 219-224.
Peters G. O.
Sandford Dean
Union Oil Company of California
Wirzbicki Gregory F.
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