Sara L Rolfe

US Patent:

7879756, Feb 1, 2011

Filed:

Aug 11, 2008

Appl. No.:

12/189424

Inventors:

Belma Demirel - Longmont CO, US
Charles B. Benham - Arvada CO, US
Jesse W. Taylor - Westminister CO, US
Pandurang V. Nikrad - Boulder CO, US
Sara L. Rolfe - Loveland CO, US
Olga P. Ionkina - Boulder CO, US
Dawid J. Duvenhage - Evergreen CO, US
Harold A. Wright - Longmont CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

B01J 23/00
B01J 21/00
B01J 20/00

US Classification:

502331, 502330, 502338

Abstract:

A method of producing an iron catalyst for catalyzing the hydrogenation of carbon monoxide is disclosed. The method comprises using a reduced amount of acid for iron dissolution compared to certain previous methods. The resulting acidic iron mixture is heated without boiling to obtain a nitrate solution having a Fe:Fe ratio in the range of about 0. 01%:99. 99% to about 100%:0% (wt:wt). Iron phases are precipitated at a lower temperature compared to certain previous methods. The recovered catalyst precursor is dried and sized to form particles having a size distribution between 10 microns and 100 microns. In embodiments, the Fe:Fe ratio in the nitric acid solution may be in the range of from about 3%:97% to about 30%:70% (wt:wt) and the calcined catalyst may comprise a maghemite:hematite ratio of about 1%:99% to about 70%:30%.

US Patent:

7915193, Mar 29, 2011

Filed:

Nov 18, 2008

Appl. No.:

12/272960

Inventors:

Belma Demirel - Longmont CO, US
Charles B. Benham - Arvada CO, US
Dan Fraenkel - Boulder CO, US
Richard Bley - Longmont CO, US
Jesse W. Taylor - Westminster CO, US
Bahman Rejai - Littleton CO, US
Sara Rolfe - Loveland CO, US
Harold A. Wright - Longmont CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

B01J 23/42

US Classification:

502158, 502336, 502327, 502326, 502302, 518715, 518700

Abstract:

A method of activating an iron Fischer-Tropsch catalyst by introducing an inert gas into a reactor comprising a slurry of the catalyst at a first temperature, increasing the reactor temperature from the first temperature to a second temperature at a first ramp rate, wherein the second temperature is in the range of from about 150 C. to 250 C. , introducing synthesis gas having a ratio of H:CO to the reactor at a space velocity, and increasing the reactor temperature from the second temperature to a third temperature at a second ramp rate, wherein the third temperature is in the range of from about 270 C. to 300 C. The iron Fischer-Tropsch catalyst may be a precipitated unsupported iron catalyst, production of which is also provided.

US Patent:

7968611, Jun 28, 2011

Filed:

Feb 26, 2010

Appl. No.:

12/713807

Inventors:

Belma Demirel - Longmont CO, US
Charles B. Benham - Arvada CO, US
Jesse W. Taylor - Westminister CO, US
Pandurang V. Nikrad - Boulder CO, US
Sara L. Rolfe - Loveland CO, US
Olga P. Ionkina - Boulder CO, US
Dawid J. Duvenhage - Evergreen CO, US
Harold A. Wright - Longmont CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

C07C 27/00
B01J 23/00
B01J 21/00
B01J 20/00

US Classification:

518713, 502330, 502331, 502338

Abstract:

A method of producing an iron catalyst for catalyzing the hydrogenation of carbon monoxide is disclosed. The method comprises using a reduced amount of acid for iron dissolution compared to certain previous methods. The resulting acidic iron mixture is heated without boiling to obtain a nitrate solution having a Fe:Fe ratio in the range of about 0. 01%: 99. 99% to about 100%:0% (wt:wt). Iron phases are precipitated at a lower temperature compared to certain previous methods. The recovered catalyst precursor is dried and sized to form particles having a size distribution between 10 microns and 100 microns. In embodiments, the Fe:Fe ratio in the nitric acid solution may be in the range of from about 3%:97% to about 30%:70% (wt:wt) and the calcined catalyst may comprise a maghemite:hematite ratio of about 1%:99% to about 70%:30%.

US Patent:

8138115, Mar 20, 2012

Filed:

Feb 26, 2010

Appl. No.:

12/713358

Inventors:

Belma Demirel - Longmont CO, US
Charles B. Benham - Arvada CO, US
Jesse W. Taylor - Westminister CO, US
Pandurang V. Nikrad - Boulder CO, US
Sara L. Rolfe - Loveland CO, US
Olga P. Ionkina - Boulder CO, US
Dawid J. Duvenhage - Evergreen CO, US
Harold A. Wright - Longmont CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

B01J 23/00

US Classification:

502331, 502338, 502345

Abstract:

A method of producing an iron catalyst for catalyzing the hydrogenation of carbon monoxide is disclosed. The method comprises using a reduced amount of acid for iron dissolution compared to certain previous methods. The resulting acidic iron mixture is heated without boiling to obtain a nitrate solution having a Fe:Fe ratio in the range of about 0. 01%:99. 99% to about 100%:0% (wt:wt). Iron phases are precipitated at a lower temperature compared to certain previous methods. The recovered catalyst precursor is dried and sized to form particles having a size distribution between 10 microns and 100 microns. In embodiments, the Fe:Fe ratio in the nitric acid solution may be in the range of from about 3%:97% to about 30%:70% (wt:wt) and the calcined catalyst may comprise a maghemite:hematite ratio of about 1%:99% to about 70%:30%.

US Patent:

8435920, May 7, 2013

Filed:

Oct 11, 2010

Appl. No.:

12/901598

Inventors:

James H. White - Boulder CO, US
Erick J. Schutte - Thornton CO, US
Sara L. Rolfe - Loveland CO, US

Assignee:

Eltron Research & Development, Inc. - Boulder CO

International Classification:

B01J 23/10
B01J 23/02
B01J 23/72
B01J 23/889
C07C 4/06
B01J 38/04

US Classification:

502304, 502 20, 502 29, 502 31, 502 33, 502 34, 502 51, 502 52, 502 53, 502324, 502331, 502338, 502340, 502523, 252373, 585636, 585664

Abstract:

Processes are disclosure which comprise alternately contacting an oxygen-carrying catalyst with a reducing substance, or a lower partial pressure of an oxidizing gas, and then with the oxidizing gas or a higher partial pressure of the oxidizing gas, whereby the catalyst is alternately reduced and then regenerated to an oxygenated state. In certain embodiments, the oxygen-carrying catalyst comprises at least one metal oxide-containing material containing a composition having the following formulas: (a) CeBB′B″O, wherein B=Ba, Sr, Ca, or Zr; B′=Mn, Co, and/or Fe; B″=Cu; 0. 01

US Patent:

8530366, Sep 10, 2013

Filed:

Jan 5, 2011

Appl. No.:

12/984902

Inventors:

Harold A. Wright - Longmont CO, US
Belma Demirel - Longmont CO, US
Sergio Mohedas - Westminster CO, US
Bahman Rejai - Littleton CO, US
Ray Huang - Denver CO, US
Deena Ferdous - Aurora CO, US
Jesse W. Taylor - Baldwinsville NY, US
Dawid J. Duvenhage - Evergreen CO, US
Sara L. Rolfe - Loveland CO, US

Assignee:

Rentech, Inc. - Los Angeles CA

International Classification:

B01J 20/34
C07C 27/00

US Classification:

502 34, 502 20, 502 21, 518700

Abstract:

A method of preparing a spray dried catalyst by combining spray dried catalyst particles with wax so the spray dried catalyst particles are coated with wax, yielding wax coated catalyst particles, and shaping the wax coated catalyst to provide shaped wax coated catalyst. A method of activating Fischer-Tropsch catalyst particles containing oxides by contacting the catalyst particles with a reducing gas in an activation vessel to produce an activated catalyst, wherein contacting is performed in the absence of a liquid medium under activation conditions. A system for activating a Fischer-Tropsch catalyst containing an activation reactor configured to introduce an activation gas to a fixed or fluidized bed of the Fischer-Tropsch catalyst in the absence of a liquid medium and at least one separation device configured to separate a gas stream comprising entrained catalyst fines having an average particle size below a desired cutoff size from the activation reactor.

US Patent:

20080164443, Jul 10, 2008

Filed:

Sep 20, 2007

Appl. No.:

11/858564

Inventors:

James H. White - Boulder CO, US
Erick J. Schutte - Thornton CO, US
Sara L. Rolfe - Loveland CO, US

Assignee:

ELTRON RESEARCH & DEVELOPMENT, INC. - Boulder CO

International Classification:

B01J 38/04
C01B 3/38
C07C 5/333
C07B 41/00
B01D 53/46
C01B 15/01
C01B 31/18

US Classification:

252373, 502 34, 585661, 423219, 423584, 4234182, 568956

Abstract:

Processes are disclosure which comprise alternately contacting an oxygen-carrying catalyst with a reducing substance, or a lower partial pressure of an oxidizing gas, and then with the oxidizing gas or a higher partial pressure of the oxidizing gas, whereby the catalyst is alternately reduced and then regenerated to an oxygenated state. In certain embodiments, the oxygen-carrying catalyst comprises at least one metal oxide-containing material containing a composition having one of the following formulas: (a) CeBB′B″O, wherein B=Ba, Sr, Ca, or Zr; B′=Mn, Co, or Fe; B″=Cu; 0.01

US Patent:

20090062108, Mar 5, 2009

Filed:

Aug 26, 2008

Appl. No.:

12/198459

Inventors:

Belma Demirel - Longmont CO, US
Charles B. Benham - Arvada CO, US
Dan Fraenkel - Boulder CO, US
Richard A. Bley - Longmont CO, US
Jesse W. Taylor - Westminster CO, US
Sara L. Rolfe - Loveland CO, US
Harold A. Wright - Longmont CO, US

Assignee:

RENTECH, INC. - Los Angeles CA

International Classification:

B01J 23/72
B01J 21/06
B01J 23/02
B01J 31/28

US Classification:

502158, 502331, 502245, 502174, 502201

Abstract:

A method of strengthening a precipitated unsupported iron catalyst by: preparing a precipitated unsupported iron catalyst containing copper and potassium; adding a solution comprising a structural promoter to the previously prepared catalyst; drying the mixture; and calcining the dried catalyst.A method for preparing an iron catalyst, the method comprising: precipitating a catalyst precursor comprising iron phases selected from hydroxides, oxides, and carbonates; adding a promoter to the catalyst precursor to yield a promoted precursor; drying the promoted precursor to yield dried catalyst; and calcining the dried catalyst, wherein the catalyst further comprises copper and potassium.A method of preparing a strengthened precipitated iron catalyst comprising: co-precipitating iron, copper, magnesium, and aluminum; washing the precipitate; alkalizing the precipitate; and drying the precipitate to yield a dried catalyst precursor. The dried catalyst precursor may be calcined and treated with a gas comprising carbon monoxide.