Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1981-07-14
1982-08-31
Peters, G. O.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423243, 423567, 210683, 210903, B01D 5334
Patent
active
043472273
ABSTRACT:
A gas stream containing SO.sub.x and NO.sub.x compounds is first treated for SO.sub.x removal by absorbing the SO.sub.x components in an aqueous liquid absorbent comprising formic or oxalic acid and an alkanolamine containing a tertiary amine functional group. When spent, this absorbent is regenerated by subjection to an elevated temperature sufficient to produce sulfur and/or hydrogen sulfide. The SO.sub.x -purified gas recovered from the first absorption step is then treated for NO.sub.x removal by contact with a second liquid absorbent solution containing a ferrous chelate in an aqueous, acidic medium. This absorbent is regenerated by contact, under conditions of elevated temperature and pressure, and in the presence of added formate ion, with a catalyst comprising a water-insoluble substance containing one or more tertiary amine functional groups such that absorbed NO.sub.x components are converted to elemental nitrogen.
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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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