Barrier discharge conversion of SO₂ and NOx to acids

Patent 6132692 Issued on October 17, 2000. Estimated Expiration Date:

February 16, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3745751

3856476

Process for utilizing collected material removed from effluent gas
Patent #: 3981815
Issued on: 09/21/1976
Inventor: Taniguchi , et al.

Method for removing sulfur dioxide from a gas stream
Patent #: 4351810
Issued on: 09/28/1982
Inventor: Martinez , et al.

Method for corona discharge enhanced flue gas clean-up
Patent #: 4650555
Issued on: 03/17/1987
Inventor: Rzad , et al.

Combined electrostatic precipitator and acidic gas removal system
Patent #: 4885139
Issued on: 12/05/1989
Inventor: Sparks, et al.

Removal of nitric oxide from waste gases and recovery as nitric acid
Patent #: 4925639
Issued on: 05/15/1990
Inventor: Stauffer

Process and apparatus for electrostatic purification of dust- and pollutant-containing exhaust gases in multiple-field precipitators
Patent #: 5137546
Issued on: 08/11/1992
Inventor: Steinbacher, et al.

NO_x reduction by sulfur tolerant coronal-catalytic apparatus and method
Patent #: 5147516
Issued on: 09/15/1992
Inventor: Mathur, et al.

Pulse method for sulfur dioxide electrolysis
Patent #: 5512144
Issued on: 04/30/1996
Inventor: Stauffer

More ...

Inventors

Application

No. 251091 filed on 02/16/1999

US Classes:

423/210, MODIFYING OR REMOVING COMPONENT OF NORMALLY GASEOUS MIXTURE204/157.3, Removing a component from normally gaseous mixture204/174, Sulfur-oxygen compounds204/177, Nitrogen compounds423/235, Nitrogen or nitrogenous component423/243.01, Utilizing aqueous reactant to remove or modify sulfur or sulfur containing component423/393, Utilizing nitrogen oxide as reactant423/522Sulfuric acid

Examiners

Primary: Griffin, Steven P.
Assistant: DiMauro, Peter

Attorney, Agent or Firm

Decker; Phillip E.

International Classes

C25B 001/22
B01D 053/60
B01D 053/64

Abstract

A process for reducing particulate, Hg, NOx, and SO2 emissions from the combustion of fossil fuel while providing the capability of producing an end product that is commercially useful comprising the steps of oxidizing Hg, NOx and SO2 using a barrier discharge reactor to produce the HgO and acids HNO3 and H2 SO4, collecting the HgO, acids and particulates in a wet ESP, and then draining them from the wet ESP to remove them from the flue gas stream.

Other References

Urabe, T., et al. "Experimental Studies on Mercury Vapor Removal by Corona Discharge . . . ", Chemical Abstracts, vol. 109, #236097, Oct. 1997
Dhali, S.K., et al. "Dielectric-barrier Discharge for Processing of SO2/NOx", Journ. App. Physics, vol. 69, pp. 6319-6324, May 1991
McLarnon, Christopher R., "Nitrogen Oxide Decomposition by Barrier Discharge," Dissertation for Doctor of Philosophy Degree in Chemical Engineering, University of New Hampshire, May 1996
Penetrante, Bernie M., "Effect of Electrical Parameters on the Chemical Kinetics of Plasma-Based Air Pollution Control," Applications of Electrostatics for Gas Phase Air Pollutants Workshop, Cincinnati, Ohio, Aug. 22, 1997
Helfritch, Dennis J., "Plasma Based Technologies Applied to Air Pollution Control," Applications of Electrostatics for Gas Phase Air Pollutants Workshop, Cincinnati, Ohio, Aug. 22, 1997
Monroe, Larry S., et al., "Testing of a Combined Dry and Wet Electrostatic Precipitator for Control of Fine Particulate Emissions from a Coal-Fired Boiler," EPRI-DOE-EPA Combined Utility Air Pollutant Control Symposium, Washington, DC, Aug. 25-29, 1997
Chemetics International Ltd., Acid Recovery and Concentration Brochure, date unknown, Vancouver, Canad