Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1999-03-15
2000-12-19
Griffin, Steven P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423235, 4232421, 423393, B01J 800, C01B 2100, C01B 1700, C01B 2138
Patent
active
061624098
ABSTRACT:
An exhaust gas stream containing oxides of nitrogen and sulfur from a fossil fuel fired boiler, a fired process heater, or a chemical process are diverted from a stack prior to emission to the atmosphere through a duct system to a mixer where an oxidant, such as ozone, is added to the exhaust gas at a preselected molar ratio for a preselected residence time to transform the oxides to higher order nitrogen oxides. The oxidized contaminants are treated with a reagent solution. The reagent solution absorbs the oxidized contaminants and unreacted oxidant in the exhaust gas stream. Nitrogen and sulfur oxides in the gas steam are transformed to dilute acids which are neutralized to form salts suitable for discharge to a municipal waste water treatment plant or landfill disposal. The salt solution is also useful as a fertilizer or in the manufacture of fertilizers. The treated exhaust gas is then emitted from an exhaust stack containing NO.sub.x and SO.sub.x contaminants at a ppm level meeting required air quality standards.
REFERENCES:
patent: 4011298 (1977-03-01), Fukui et al.
"Simultaneous Oxidation of Nitrogen Oxides and Sulfur Dioxide with Ozone and Hydrogen Peroxide" Nelo et al., Chem. Eng. Technol. vol. 20, p.(40-42), 1997.
Koltick, Jr. John M.
Rohrer, Jr. Wesley M.
Skelley Arthur P.
Suchak Naresh J.
Griffin Steven P.
Medina Maribel
Skelley Arthur P.
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