Robert T Ferrell

US Patent:

6387348, May 14, 2002

Filed:

Jan 12, 2000

Appl. No.:

09/481950

Inventors:

Robert J. Ferrell - Rutherford NJ
Thulasidas Chellppannair - Edison NJ
James K. Tseng - Berkeley Heights NJ

Assignee:

The BOC Group, Inc. - Murray Hill NJ

International Classification:

C01D 100

US Classification:

423642, 423641, 423183

Abstract:

Sulfur compounds present as sulfides and mercaptans in spent caustic streams from refinery and petrochemical processes are oxidized by contacting them with an oxygen-containing gas in a packed column recycle reactor.

US Patent:

6649132, Nov 18, 2003

Filed:

Jul 23, 2002

Appl. No.:

10/201335

Inventors:

Neeraj Saxena - Murray Hill NJ
Naresh Suchak - Ridgewood NJ
Robert J. Ferrell - Rutherford NJ

Assignee:

The BOC Group, Inc. - Murray Hill NJ

International Classification:

B01D 5334

US Classification:

423210, 4232155, 4232421, 423235, 204174, 204177

Abstract:

The present invention relates to a process for removing nitrogen oxides, sulfur dioxides and mercury from gas streams such as furnace or utility boiler flue gas streams, particularly those derived from coal-fired utility boilers. A stream containing relatively low concentration of ozone from an ozone concentrator is feed to a barrier discharge reactor. Nitrogen oxides and mercury in the flue gas are oxidized by oxygen and hydroxyl radicals formed in the reactor. The flue gas is then directed to a reactor duct along with the ozone at a greater concentration wherein the remaining nitrogen oxides and mercury in the gas stream will react with the ozone to form nitric acid, nitric acid precursors, mixtures thereof and mercuric oxide. These impurities can then be removed from the gas stream by use of an aqueous scrubber, a wet electrostatic precipitator, a dry scrubber or a semi-dry scrubber.

US Patent:

6761863, Jul 13, 2004

Filed:

Jan 29, 2002

Appl. No.:

10/059459

Inventors:

Neeraj Saxena - Murray Hill NJ
Robert J. Ferrell - Rutherford NJ
Naresh Suchak - North Plainfield NJ
Lev Davydov - North Plainfield NJ
James K. Tseng - Berkeley Heights NJ
Chester Gorski - Kendall Park NJ

Assignee:

The BOC Group, Inc. - New Providence NJ

International Classification:

B01D 5356

US Classification:

423235, 423210, 4232155, 4232391, 42324301

Abstract:

The present invention relates to a process for removing nitrogen oxides, sulfur oxides, mercury and mercuric oxide from gas streams such as furnace or utility boiler flue gas streams, particularly those derived from coal-fired utility boilers, or from a gas stream from another pollutant abatement process. Ozone will react with the impurities in the gas stream to form mercuric oxide and higher oxides of nitrogen which can be removed by scrubber means. Additionally, and alternatively, the present invention provides for the use of ozone and ultraviolet radiation to remove nitrogen oxides, sulfur oxides and mercury from gas streams.

US Patent:

61972681, Mar 6, 2001

Filed:

Jul 2, 1999

Appl. No.:

9/347316

Inventors:

Neeraj Saxena - New Providence NJ
Mark H. Anderson - Bethlehem PA
Robert James Ferrell - Rutherford NJ

Assignee:

The BOC Group, Inc. - Murray Hill NJ

International Classification:

C01B 2100
C01B 2138

US Classification:

423235

Abstract:

Nitrogen oxides are removed from a waste gas stream by contacting the waste gas stream with ammonia, thereby reducing the nitrogen oxides to nitrogen. Residual nitrogen oxides and unreacted ammonia in the waste gas stream leaving the nitrogen oxides reducing step are oxidized to nitrogen pentoxide or nitric acid by contacting this gas stream with ozone. Contact of the ozone and waste gas is preferably carried out in the presence of an aqueous solution at a pH above about 9 and at a temperature above about 75. degree. C. , and this step is preferably carried out in the presence of an ammonia-oxidizing catalyst.