Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1989-05-08
1990-03-20
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423242, C01B 2100, C01B 1700
Patent
active
049100025
ABSTRACT:
The invention relates to a cyclic process for the removal of NO.sub.x and SO.sub.x from a gas stream containing NO.sub.x and SO.sub.x. The gas stream is scrubbed with an aqueous reaction solution containing an organic, water-soluble, polymeric chelate containing a polyvalent metal ion. The NO.sub.x is absorbed and in the presence of SO.sub.x, the imidodisulfonate is formed. The aqueous reaction solution containing chelate and imidodisulfonate is contacted with a first membrane separation means, wherein calcium oxide is added to the first permeate stream, resulting in the precipitation of calcium sulfite. The calcium sulfite is filtered from the first permeate stream, the first permeate stream combined with the first non-permeate stream, and the combined stream contacted with a second membrane separation means which removes a portion of the water and other low molecular weight materials, with recycle of the remaining non-permeate stream containing chelate to the scrubber. Water-soluble alkali is added to the process as needed.
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Heller Gregory A.
The Dow Chemical Company
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