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Title: Use of aromatic salts for simultaneously removing SO.sub.2 and NO.sub.x pollutants from exhaust of a combustion system

A method is disclosed for removing pollutants from the exhaust of combustion systems burning fuels containing substantial amounts of sulfur and nitrogen. An exemplary method of the invention involves the formation and reaction of a sorbent comprising calcium benzoate. The calcium benzoate is either dry-sprayed (in the form of a fine powder) or wet-sprayed in an aqueous solution in a high temperature environment such as a combustion chamber. The latter technique is feasible since calcium benzoate is a water-soluble form of calcium. When the dispersed particles of calcium benzoate are heated to a high temperature, the organic benzoate burns off and fine calcium oxide particles are formed. These particles are cenospheric (hollow) and have thin and highly porous walls, thus, affording optimum external and internal accessibility for reacting with toxic gaseous emissions such as SO.sub.2. Further, the combustion of the organic benzoate portion of the sorbent results in the conversion of NO.sub.x to N.sub.2.
Inventors:
 [1];  [2]
  1. (Boston, MA)
  2. (Belmont, MA)
Issue Date:
OSTI Identifier:
869525
Assignee:
Northeastern University (Boston, MA) OSTI
Patent Number(s):
US 5352423
Application Number:
08/039,853
Country of Publication:
United States
Language:
English
Subject:
aromatic; salts; simultaneously; removing; pollutants; exhaust; combustion; method; disclosed; systems; burning; fuels; containing; substantial; amounts; sulfur; nitrogen; exemplary; involves; formation; reaction; sorbent; comprising; calcium; benzoate; dry-sprayed; form; fine; powder; wet-sprayed; aqueous; solution; temperature; environment; chamber; latter; technique; feasible; water-soluble; dispersed; particles; heated; organic; burns; oxide; formed; cenospheric; hollow; highly; porous; walls; affording; optimum; external; internal; accessibility; reacting; toxic; gaseous; emissions; portion; results; conversion; simultaneously removing; combustion systems; fuels containing; calcium oxide; combustion chamber; aqueous solution; oxide particles; substantial amount; fine powder; systems burning; porous wall; removing pollutants; substantial amounts; highly porous; temperature environment; gaseous emissions; comprising calcium; porous walls; exemplary method; fine calcium; dispersed particles; oxide particle; toxic gas; burning fuels; containing substantial; /423/