Process for the removal of NO from fluid streams using a water soluble polymeric chelate of a polyvelant metal
A cyclic process for the removal of NO from a fluid stream comprising mixtures of NO and SO/sub 2/, which process comprises: (A) contacting the fluid stream in a contacting zone with an aqueous reaction solution at a temperature of between about 10 and 90C, the reaction solution itself comprising an effective amount of a water-soluble organic polymeric chelate, containing a polyvalent metal effective to absorb the NO present, wherein the polymeric chelate has a molecular weight of between about 500 and 1,000,000 and pendant chelating groups are selected from chelates of the formula; (B) separating the fluid stream and the resulting aqueous phase containing the polymeric chelate iron (II) and imidodisulfonate of step (A); (C) concentrating the aqueous phase repeated in step (B) by membrane means effective to remove a portion of the water and other monomeric reaction products having a molecular weight below 500 and; (D) recycling the concentrated aqueous solution containing the water-soluble polymeric chelate produced in Step (C) to the contacting zone of step (A).
- Assignee:
- Dow Chemical Co., Midland, MI
- Patent Number(s):
- US 4778664
- OSTI ID:
- 6635425
- Resource Relation:
- Patent File Date: Filed date 18 Feb 1987
- Country of Publication:
- United States
- Language:
- English
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ABSORPTION
AIR POLLUTION CONTROL
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DENITRATION
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