Mark E Bohn

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:

6712982, Mar 30, 2004

Filed:

Apr 17, 2003

Appl. No.:

10/417107

Inventors:

Mark S. Bohn - Golden CO
James E. Siebarth - Denver CO

Assignee:

Rentech, Inc. - Denver CO

International Classification:

B01D 2100

US Classification:

210802, 210521, 210522, 518709, 518728

Abstract:

Catalyst particles are separated from the wax in a reactor slurry reactor by feeding a portion of the slurry to a dynamic settler. Heavier catalyst particles settle and are removed as the slurry at the bottom of the settler is recycled back to the reactor. Clarified wax is removed at the top of the settler. A multi-channel baffle prevents turbulence, improving retention of the desired heavier catalyst particles.

US Patent:

6730221, May 4, 2004

Filed:

May 29, 2001

Appl. No.:

09/871148

Inventors:

Mark S. Bohn - Golden CO
James E. Siebarth - Lakewood CO

Assignee:

Rentech, Inc. - Denver CO

International Classification:

B01D 2100

US Classification:

210251, 210521, 210522, 518700, 518705, 518709, 208950, 585902

Abstract:

Catalyst particles are separated from the wax in a reactor slurry reactor by feeding a portion of the slurry to a dynamic settler. Heavier catalyst particles settle and are removed as the slurry at the bottom of the settler is recycled back to the reactor. Clarified wax is removed at the top of the settler. A multi-channel baffle prevents turbulence, improving retention of the desired heavier catalyst particles.

US Patent:

7108835, Sep 19, 2006

Filed:

Oct 8, 2003

Appl. No.:

10/681823

Inventors:

William H. Hawthorne - Thornton CO, US
Mark D. Ibsen - Highlands Ranch CO, US
Peter S. Pedersen - Boulder CO, US
Mark S. Bohn - Golden CO, US

Assignee:

Rentech, Inc. - Denver CO

International Classification:

F27B 15/14
F27B 15/08
B01J 1/36
F28D 7/00
F28D 11/00

US Classification:

422146, 49147, 49200, 49201, 165 86, 16510416, 16510418, 518728

Abstract:

An arrangement of cooling tubes within a Fischer-Tropsch slurry reactor simplifies removal and reinstallation of cooling tubes for reactor maintenance.

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:

7683006, Mar 23, 2010

Filed:

Mar 27, 2009

Appl. No.:

12/412779

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:

B01J 23/745
C07C 27/06

US Classification:

502338, 518719, 518720

Abstract:

A method for transforming at least a part of the catalyst precursor hematite into x-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:

20020120017, Aug 29, 2002

Filed:

Sep 25, 2001

Appl. No.:

09/963253

Inventors:

Mark Bohn - Golden CO, US
Charles Benham - Littleton CO, US

International Classification:

C07C027/06

US Classification:

518/703000

Abstract:

Apparatus and processes for producing power, liquid hydrocarbons and carbon dioxide from heavy feedstocks, using a partial oxidation reactor to produce a synthesis gas, a Fischer-Tropsch reactor to convert the synthesis gas to hydrocarbon products and tail gases containing hydrogen and carbon dioxide, and a combined cycle plant to produce power from steam generated by recovering heat from the reactors and from combustible tail gases. By varying operating conditions and utilizing hydrogen for recycle to the Fischer-Tropsch reactor and/or hydrocracking wax products to produce lighter hydrocarbons, the process can selectively maximize the production of power, hydrocarbons or carbon dioxide. In preferred embodiments, the Fischer-Tropsch reactor can be a slurry reactor and can employ an iron-based catalyst.

US Patent:

20090069450, Mar 12, 2009

Filed:

Sep 8, 2008

Appl. No.:

12/206538

Inventors:

Mark Ibsen - Highlands Ranch CO, US
Sergio Mohedas - Westminster CO, US
Frank Hogsett - Arvada CO, US
Mark Bohn - Golden CO, US
Harold A. Wright - Longmont CO, US

Assignee:

RENTECH, INC. - Los Angeles CA

International Classification:

C07C 1/04
B01J 19/00

US Classification:

518709, 422187

Abstract:

A catalytic reaction system comprising: a catalytic reactor fluidly connected with at least two slurry loops, wherein the reactor comprises at least as many reactor product outlets and at least as many slurry return inlets as slurry loops; wherein each slurry loop comprises a separation system comprising a separation system inlet, a separation system product outlet, and a concentrated catalyst slurry outlet; a slurry offtake fluidly connecting the separation system inlet with one of the reactor product outlets; and a slurry return fluidly connecting the separation system outlet with one of the slurry return inlets. The system may comprise at least three slurry loops. The system may comprise at least four slurry loops. A method for converting synthesis gas into liquid hydrocarbons via the catalytic reaction system in also disclosed.