Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1981-03-11
1982-05-25
Peters, G. O.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423243, 423611, B01D 5334
Patent
active
043316395
ABSTRACT:
Gas streams containing SO.sub.x and/or NO.sub.x compounds are treated in an absorption-regeneration process for removal of the SO.sub.x and/or NO.sub.x compounds. The process in one embodiment removes SO.sub.x compounds from a stack gas or other feed gas stream by (1) absorbing the SO.sub.x into a novel aqueous liquid absorbent comprising formic acid and an alkanolamine containing a tertiary amine functional group and (2) regenerating the absorbent when spent by subjecting the spent absorbent to an elevated temperature above that utilized for absorption of said SO.sub.x, said elevated temperature being sufficient to convert a substantial proportion of the dissolved SO.sub.x to elemental sulfur and/or H.sub.2 S. If NO.sub.x compounds are present in the stack gas stream, they may also be removed, NO.sub.2 being removed without modification of the process for removing SO.sub.x compounds, and NO by providing in the 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 conditions similar to those employed for spent absorbents containing absorbed SO.sub.x compounds. During regeneration, the dissolved SO.sub.x compounds are converted to hydrogen sulfide and/or sulfur and the dissolved NO.sub.x compounds are converted to nitrogen. The invention is most useful for removing SO.sub.2 from gas streams.
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Albertson Walter
Hass Robert H.
Peters G. O.
Sandford Dean
Union Oil Company of California
Wirzbicki Gregory F.
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