PROCESS FOR THE REMOVAL OF NO FROM FLUID STREAMS USING A WATER-SOLUBLE POLYMERIC CHELATE OF A POLYVALENT METAL

摘要

ABSTRACTThe present invention concerns to a cyclic continuousprocess and for the removal of NO and SO2 from a variety of fluidstreams. A fluid stream containing NO and SO2 is contacted with anaqueous solution of a composition having a water-soluble organicpolymeric chelate containing a polyvalent metal, e.g ., Fe (11). TheNO is catalytically absorbed and in the presence of SO2, theimidodisulfonate is formed. Optionally, a reducing agent, such assodium hydrogen sulfide, is added to maintain the polyvalent metal inthe reduced state. The process next includes removal of theimidodisulfonate formed. The separation of water and low molecularweight materials and products, e.g. molecular weight below 500,usually occurs by ultrafiltration or dialysis, with recycle and re-useof the polyvalent metal chelate.