Dennis L Yakobson

US Patent:

6380268, Apr 30, 2002

Filed:

Apr 27, 2000

Appl. No.:

09/560248

Inventors:

Dennis L. Yakobson - Arvada CO 80005
John S. Vavruska - Santa Fe NM 87501
Edward Bohn - Burien WA 98166
Andreas Blutke - Seattle WA 98116

International Classification:

C07C 2700

US Classification:

518700, 518702, 21912136

Abstract:

Fischer-Tropsch (FT) products are formed in a plant utilizing a combination of a plasma reformer reactor ( ) and an FT reactor ( ). Feedstocks ranging from gases such as methane and natural gas to solids such as petroleum coke and coal are plasma reformed with water and/or CO2 to produce one or more of hydrogen, oils, liquid alkanes and oxygenated alkanes, oil and waxes. The specific ancillary equipment, e. g. , boilers ( ), preheaters, condensers ( ) ( ), gas liquid separators ( ) ( ), compressors ( ) ( ), etc. will be combined or omitted as needed for treatment of desired raw materials as shown by the Figures.

US Patent:

6534552, Mar 18, 2003

Filed:

Jun 1, 2001

Appl. No.:

09/870466

Inventors:

Charles B. Benham - Littleton CO
Mark S. Bohn - Golden CO
Dennis L. Yakobson - Arvada CO

Assignee:

Rentech, Inc. - Denver CO

International Classification:

C07C 2700

US Classification:

518715, 518703, 518704, 518705, 518700

Abstract:

Increased hydrocarbon yields from natural gas and reduced oxygen consumption improvements are obtained by recycling hydrogen to a Fischer-Tropsch reactor, which can have a catalyst exhibiting either a low water gas shift activity such as cobalt, or a high water gas shift activity such as iron. At least a portion of the remaining tail gas, either before or after the hydrogen has been removed, is recycled to the inlet of the synthesis gas production reactor.

US Patent:

6632846, Oct 14, 2003

Filed:

Sep 25, 2001

Appl. No.:

09/963349

Inventors:

Richard O. Sheppard - Evergreen CO
Dennis L. Yakobson - Arvada CO

Assignee:

Rentech, Inc. - Denver CO

International Classification:

C07C 2700

US Classification:

518715, 518700, 518717, 518721, 423359, 564 65, 60 3902

Abstract:

A plant for manufacturing urea from carbonaceous materials, oxygen from an air separation unit and water, preferably steam, is made up of a syngas generator unit, an air separation unit, Fischer-Tropsch unit, a CO removal unit, a hydrogen removal unit, a methanator unit, an ammonia converter unit and a urea synthesizer unit. Each of Fischer-Tropsch liquids, ammonia, hydrogen and urea can be recoverable under proper economic conditions. Electrical power is recoverable by the addition of at least one of a steam turbine and a gas turbine which is/are coupled to an electrical generator.

US Patent:

6809123, Oct 26, 2004

Filed:

Aug 7, 2002

Appl. No.:

10/213896

Inventors:

Dennis L. Yakobson - Arvada CO

Assignee:

Rentech, Inc. - Denver CO

International Classification:

C07C 2700

US Classification:

518721, 518713, 518715, 518717, 518719, 518726

Abstract:

A carbon-bearing feedstock is reacted with oxygen and water in a partial oxidation reactor to produce a mixture of hydrogen and carbon monoxide. The hydrogen is removed as a first product and the remaining carbon monoxide is reacted with steam over a bifunctional catalyst to produce higher hydrocarbons and carbon dioxide. The bifunctional catalyst provides water gas shift and Fischer-Tropsch functions.

US Patent:

6976362, Dec 20, 2005

Filed:

Jul 1, 2003

Appl. No.:

10/612573

Inventors:

Richard O. Sheppard - Evergreen CO, US
Dennis L. Yakobson - Arvada CO, US

Assignee:

Rentech, Inc. - Denver CO

International Classification:

F02C003/22

US Classification:

60780, 60781, 60 3912, 60 39464

Abstract:

A plant for producing Fischer-Tropsch liquids and electrical power with greatly reduced emissions of carbon dioxide to the atmosphere is made up of a syngas generator unit, an air separation unit, a Fischer-Tropsch unit, a COremoval unit, and a combined cycle electricity generation unit. Each of Fischer-Tropsch liquids, carbon dioxide, and electrical power can be recoverable under proper economic conditions. Electrical power is recoverable by the use of a gas turbine fueled by predominantly hydrogen and a steam turbine powered by steam generated by cooling exhaust gases from the gas turbine. Sequestration of COand fueling the gas turbine with hydrogen reduces the amount of greenhouse gases emitted to the atmosphere.

US Patent:

7300642, Nov 27, 2007

Filed:

Dec 3, 2004

Appl. No.:

11/004036

Inventors:

Peter S. Pedersen - Boulder CO, US
Dennis L. Yakobson - Arvada CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

C01B 3/24
C01C 1/04
C07C 5/00
C07C 27/06
C01B 3/26

US Classification:

423359, 252373, 423650, 423652, 518703, 585250

Abstract:

A gasification plant for producing ammonia, Fischer-Tropsch fuels, and electrical power from carbon-bearing feedstocks.

US Patent:

7544719, Jun 9, 2009

Filed:

Jul 12, 2006

Appl. No.:

11/456962

Inventors:

Dennis L. Yakobson - Arvada CO, US
Elijah C. Philipp - Westminster CO, US
Mark S. Bohn - Golden CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

C07C 27/06
B01J 23/70

US Classification:

518720, 518715, 518719, 502338

Abstract:

A method for transforming at least a part of the catalyst precursor hematite into χ-carbide (FeC) and ε′-carbide (FeC) without a large amount of fines generation. This method slows the transformation of the hematite to iron carbides by reducing the partial pressure of the synthesis gas by inert gas dilution. The activation time is about three to about five hours.

US Patent:

7644587, Jan 12, 2010

Filed:

Dec 21, 2005

Appl. No.:

11/316455

Inventors:

Dennis L. Yakobson - Arvada CO, US
Charles B. Benham - Arvada CO, US
Belma Demirel - Longmont CO, US
Peter S. Pedersen - Boulder CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

F02C 3/28
F02C 6/14

US Classification:

60780, 60 3912, 60 39464

Abstract:

A method for meeting both base-load and peak-load demand in a power production facility. By integrating a Fischer-Tropsch (FT) hydrocarbon production facility with an electrical power generating facility, peak-load power demand can be met by reducing the temperature of the FT reactor thereby increasing the quantity of tail gases and using FT tail gases to fuel a gas turbine generator set. The method enables rapid power response and allows the synthesis gas generating units and the FT units to operate with constant flow rates.