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Title: Metal chelate process to remove pollutants from fluids

The present invention relates to improved methods using an organic iron chelate to remove pollutants from fluids, such as flue gas. Specifically, the present invention relates to a process to remove NO[sub x] and optionally SO[sub 2] from a fluid using a metal ion (Fe[sup 2+]) chelate wherein the ligand is a dimercapto compound wherein the --SH groups are attached to adjacent carbon atoms (HS--C--C--SH) or (SH--C--CCSH) and contain a polar functional group so that the ligand of DMC chelate is water soluble. Alternatively, the DMC is covalently attached to a water insoluble substrate such as a polymer or resin, e.g., polystyrene. The chelate is regenerated using electroreduction or a chemical additive. The dimercapto compound bonded to a water insoluble substrate is also useful to lower the concentration or remove hazardous metal ions from an aqueous solution. 26 figures.
Inventors:
Issue Date:
OSTI Identifier:
6876071
Assignee:
University of California, Oakland, CA (United States) PTO; EDB-95-031175
Patent Number(s):
US 5370849; A
Application Number:
PPN: US 7-968585
Contract Number:
AC03-76SF00098
Resource Relation:
Patent File Date: 29 Oct 1992
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; CHELATES; PERFORMANCE; REGENERATION; FLUE GAS; DENITRIFICATION; DESULFURIZATION; CHEMICAL COMPOSITION; IRON COMPOUNDS; METALS; NITROGEN OXIDES; REMOVAL; SULFUR DIOXIDE; CHALCOGENIDES; CHEMICAL REACTIONS; COMPLEXES; ELEMENTS; GASEOUS WASTES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; SULFUR COMPOUNDS; SULFUR OXIDES; TRANSITION ELEMENT COMPOUNDS; WASTES 540120* -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-); 010800 -- Coal, Lignite, & Peat-- Waste Management