Soon-Jai Khang

US Patent:

7022296, Apr 4, 2006

Filed:

Nov 14, 2000

Appl. No.:

09/712626

Inventors:

Soon-Jai Khang - Cincinnati OH, US
Timothy Keener - Cincinnati OH, US

Assignee:

University of Cincinnati - Cincinnati OH

International Classification:

B01D 53/96
B01D 53/50
B01D 53/56
B01D 53/70
B01D 53/68

US Classification:

423210, 95 57, 95 73, 4232155, 423235, 423240 R, 423240 S, 423241, 42324301, 42324308, 42324401, 42324407, 42324408, 4232451, 4232452

Abstract:

A multiple-field precipitator, flue-gas treating device, in accordance with the principles of the invention, includes a first section having a dual-function, sensible-cooling heat exchanger/electrostatic precipitator, a second section having a wet electrostatic precipitator, and a middle section fluidly connecting the first and second sections. In the first section, the exchanger/precipitator sensibly cools the flue gas and collects most of the dust from the flue gas. In the middle section, the dust-reduced flue gas is combined with an alkaline material, thereby forming reaction products. These reaction products and several other pollutants are captured by the wet electrostatic precipitator, in the form of a pollutant-laden liquid. The pollutant-laden liquid is directed to a series of heat exchangers and settling tanks, where various pollutants such as SO, metals, NO, and chlorides are removed in different stages. In addition, ammonia is liberated from the pollutant-laden liquid, and circulated back to the middle section, where it is combined with additional dust-reduced flue gas to form additional reaction products for subsequent capture in the wet electrostatic precipitator.

US Patent:

50374508, Aug 6, 1991

Filed:

Apr 12, 1990

Appl. No.:

7/508842

Inventors:

Timothy C. Keener - Cincinnati OH
Soon-Jai Khang - Cincinnati OH

Assignee:

University of Cincinnati - Cincinnati OH

International Classification:

C10L 900
C10L 908

US Classification:

44622

Abstract:

An apparatus and process for desulfurizing and denitrifying coal by pyrolysis and subsequently treating the gaseous pyrolysis by-products with a solid sorbent to substantially reduce the release of SO. sub. x gases to acceptable levels. In one aspect of the invention, coal is pyrolyzed in the inner chamber of the desulfurization and denitrification apparatus to drive off the sulfur and nitrogen compounds contained therein. In another aspect of the invention, the gaseous by-products of pyrolysis are treated with a solid sorbent in the outer chamber of the desulfurization and denitrification apparatus to substantially desulfurize those gases. In a further aspect of the invention, the desulfurized gases, which contain nitrogen compounds, are combusted under controlled conditions to minimize the production of NO. sub. x gases.

US Patent:

62143085, Apr 10, 2001

Filed:

Dec 9, 1998

Appl. No.:

9/208353

Inventors:

Timothy C. Keener - Cincinnati OH
Soon-Jai Khang - Cincinnati OH
Antoinette Weil Stein - Menlo Park CA

Assignee:

The University of Cincinnati - Cincinnati OH

International Classification:

B01D 5350
B01D 5356

US Classification:

4232391

Abstract:

A two stage method is described for the removal of NO. sub. x and SO. sub. x from flue gas. The first stage removes all NO. sub. x by sodium sulfite sorbent injection. The second stage removes SO. sub. x by sodium bicarbonate injection. The sodium sulfite product formed in the second stage is transferred to the first stage for injection.

US Patent:

46409017, Feb 3, 1987

Filed:

Mar 18, 1985

Appl. No.:

6/712862

Inventors:

Soon-Jai Khang - Cincinnati OH

Assignee:

University of Cincinnati - Cincinnati OH

International Classification:

C04B 3806

US Classification:

501 81

Abstract:

The present invention concerns a method of making a silica-based membrane comprising the steps of: (1) pyrolyzing the material made of one of the class comprising polysilicone rubber, polysilane and polysiloxane at a temperature range of about 500. degree. C. to about 1000. degree. C. for about 2 hours (minimum) in an inert atmosphere; and (2) oxidizing the pyrolyzed material at a sufficient temperature range of about 300. degree. C. to about 1000. degree. C. to crosslink the material with oxygen. The membrane typically has a B. E. T. surface-area measurement of about 220 m. sup. 2 /g which indicates a highly porous membrane--about 40 to 70% porosity. The present invention may also be characterized by producing a pyrolyzed membrane by the method described above, and coating the membrane with silicon material to fill in the large micropores, and repyrolyzing the coated membrane to produce a membrane having extremely small micropores to assure that such gases as hydrogen and helium can be separated by the membrane product of the present invention to a high level of selectivity.