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Title: Flue gas desulfurization/denitrification using metal-chelate additives

Abstract

A method of simultaneously removing SO.sub.2 and NO from oxygen-containing flue gases resulting from the combustion of carbonaceous material by contacting the flue gas with an aqueous scrubber solution containing an aqueous sulfur dioxide sorbent and an active metal chelating agent which promotes a reaction between dissolved SO.sub.2 and dissolved NO to form hydroxylamine N-sulfonates. The hydroxylamine sulfonates are then separated from the scrubber solution which is recycled.

Inventors:
 [1];  [2];  [3]
  1. (Naperville, IL)
  2. (Glen Ellyn, IL)
  3. (Deerfield, IL)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
865986
Patent Number(s):
US 4612175
Assignee:
United States of America as represented by United States (Washington, DC) ANL
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
flue; gas; desulfurization; denitrification; metal-chelate; additives; method; simultaneously; removing; oxygen-containing; gases; resulting; combustion; carbonaceous; material; contacting; aqueous; scrubber; solution; containing; sulfur; dioxide; sorbent; active; metal; chelating; agent; promotes; reaction; dissolved; form; hydroxylamine; n-sulfonates; sulfonates; separated; recycled; oxide sorbent; simultaneously removing; scrubber solution; metal chelating; gas desulfurization; active metal; solution containing; carbonaceous material; sulfur dioxide; chelating agent; flue gas; flue gases; gases resulting; /423/999/

Citation Formats

Harkness, John B. L., Doctor, Richard D., and Wingender, Ronald J.. Flue gas desulfurization/denitrification using metal-chelate additives. United States: N. p., 1986. Web.
Harkness, John B. L., Doctor, Richard D., & Wingender, Ronald J.. Flue gas desulfurization/denitrification using metal-chelate additives. United States.
Harkness, John B. L., Doctor, Richard D., and Wingender, Ronald J.. 1986. "Flue gas desulfurization/denitrification using metal-chelate additives". United States. doi:. https://www.osti.gov/servlets/purl/865986.
@article{osti_865986,
title = {Flue gas desulfurization/denitrification using metal-chelate additives},
author = {Harkness, John B. L. and Doctor, Richard D. and Wingender, Ronald J.},
abstractNote = {A method of simultaneously removing SO.sub.2 and NO from oxygen-containing flue gases resulting from the combustion of carbonaceous material by contacting the flue gas with an aqueous scrubber solution containing an aqueous sulfur dioxide sorbent and an active metal chelating agent which promotes a reaction between dissolved SO.sub.2 and dissolved NO to form hydroxylamine N-sulfonates. The hydroxylamine sulfonates are then separated from the scrubber solution which is recycled.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1986,
month = 1
}

Patent:

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  • This patent describes a method for removing SO/sub 2/ and NO from flue gas containing oxygen resulting from the combustion of carbonaceous material which consists of: preparing an aqueous scrubber solution containing an aqueous sulfur dioxide sorbent and an active metal chelate, the active metal chelate being prepared by mixing a metal ion as a soluble metal salt in an aqueous solution with a chelating agent in an oxygen-free environment for a period of time sufficient for all the possible coordination sites on the chelating agent to coordinate with the metal ion, thereby forming the active metal chelate, and contactingmore » the oxygen-containing flue gas containing at least l000 ppm SO/sub 2/ with the scrubber solution while maintaining the pH of the scrubber solution between 5 and 9, the SO/sub 2/ dissolving in the solution to form HSO/sub 3-/, the NO dissolving in the solution to form HNO/sub 2/, the HNO/sub 2/ reacting with some of the HSO/sub 3-/ to form hydroxylamine N-sulfonates, thereby removing SO/sub 2/ and NO from the flue gas.« less
  • A method of simultaneously removing SO/sub 2/ and NO from oxygen-containing flue gases resulting from the combustion of carbonaceous material by contacting the flue gas with an aqueous scrubber solution containing an aqueous sulfur dioxide sorbent and an active metal chelating agent which promotes a reaction between dissolved SO/sub 2/ and dissolved NO to form hydroxylamine N-sulfonates. The hydroxylamine sulfonates are then separated from the scrubber solution which is recycled. 3 figs.
  • This patent describes a method for controlling the growth of sulfate-reducing bacteria including Desulfovibrio desulfricans and odors including H/sub 2/S produced in flue gas desulfurization scrubber sludges which comprises treating these sludges with a biocidal and odor controlling dosage of an alkali metal nitrite in an amount of at least about 50 ppm, to control the growth of the sulfate reducing bacteria and prevent the biogenic production of the H/sub 2/S.
  • 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 andmore » 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).« less