Pak Lun Leung

6554994, Apr 29, 2003

Apr 13, 1999

09/290448

Bruce E. Reynolds - Martinez CA
Fred W. Lam - Oakland CA
Julie Chabot - Novato CA
Fernando J. Antezana - Tiburon CA
Robert Bachtel - El Cerrito CA
Kirk R. Gibson - El Cerrito CA
Richard Threlkel - El Cerrito CA
Pak C. Leung - Lafayette CA

Chevron U.S.A. Inc. - San Francisco CA

C10G 6502

208211, 208210, 208212, 208251 H, 208254 H

A reactor system and process for hydrotreating a heavy feedstock contaminated with metals sulfur and carbon residue using an upflow fixed bed reactor with at least two catalyst layers having different hydrogenation activity.

7074740, Jul 11, 2006

Jul 2, 2002

10/190202

Kirk R. Gibson - El Cerrito CA, US
Richard Threlkel - El Cerrito CA, US
Pak C. Leung - Lafayette CA, US

Chevron U.S.A. Inc. - San Ramon CA

B01J 23/00
B01J 27/00

502322, 502211, 502213, 502314, 502315, 502323

An improved catalyst for hydrodesulfurization of heavy feedstocks is disclosed. The catalyst is adopted for on-stream catalyst replacement in upflow processing units. It is characterized by a smaller peak pore diameter than general purpose hydrotreating catalysts.

7214309, May 8, 2007

Sep 10, 2004

10/938200

Kaidong Chen - Albany CA, US
Pak C. Leung - Lafayette CA, US
Bruce E. Reynolds - Martinez CA, US
Julie Chabot - Novato CA, US

Chevron U.S.A. Inc - San Ramon CA

C10G 47/02
C10G 45/04

2081113, 208 58, 208 67, 208108, 20811135, 208216 R, 208217, 208251 H, 208254 H, 502220

The instant invention is directed to a process for upgrading heavy oils using a slurry composition. The slurry composition is prepared in a series of steps, involving mixing a Group VIB metal oxide with aqueous ammonia to form an aqueous mixture and sulfiding the mixture to form a slurry. The slurry is then promoted with a Group VIII metal compound. Subsequent steps involve mixing the slurry with a hydrocarbon oil, and combining the resulting mixture with hydrogen gas (under conditions which maintain the water in a liquid phase) to produce the active slurry catalyst.

7238273, Jul 3, 2007

Sep 10, 2004

10/938269

Kaidong Chen - Albany CA, US
Pak C. Leung - Lafayette CA, US
Bruce E. Reynolds - Martinez CA, US

Chevron U.S.A. Inc - San Ramon CA

C10G 65/02

208 49, 208108, 208210, 208216 R, 208251 H, 208254 R, 208251 R, 208215

The instant invention is directed to a process for upgrading heavy oils using a slurry composition. The slurry composition is prepared by a series of steps, involving mixing a Group VIB metal oxide and aqueous ammonia to form an aqueous mixture, and sulfiding the mixture to form a slurry. The slurry is then promoted with a Group VIII metal. Subsequent steps involve mixing the slurry with a hydrocarbon oil and combining the resulting mixture with hydrogen gas and a second hydrocarbon oil having a lower viscosity than the first oil. An active catalyst composition is thereby formed.

7410928, Aug 12, 2008

Jan 26, 2007

11/627734

Kaidong Chen - Albany CA, US
Pak C. Leung - Lafayette CA, US
Bruce E. Reynolds - Martinez CA, US

Chevron U.S.A. Inc. - San Ramon CA

B01J 27/00
B01J 27/045
B01J 27/051

502216, 502 3, 502159, 502219, 502220, 502221, 502222, 502223

The instant invention is directed to the preparation of a catalyst composition suitable for the hydroconversion of heavy oils. The catalyst composition is prepared by a series of steps, involving mixing a Group VIB metal oxide particularly molybdenum oxide and aqueous ammonia to form an aqueous mixture, and sulfiding the mixture to form a slurry. The slurry is then promoted with a Group VIII metal. Subsequent steps involve mixing the slurry with a hydrocarbon oil and combining the resulting mixture with hydrogen gas and a second hydrocarbon oil having a lower viscosity than the first oil. An active catalyst composition is thereby formed.

20020043483, Apr 18, 2002

Apr 20, 2001

09/839042

Pak Leung - Lafayette CA, US
David Earls - Pinole CA, US
Bruce Reynolds - Martinez CA, US
David Johnson - Petaluma CA, US
Robert Bachtel - El Cerrito CA, US
Harold Trimble - Panama City Beach FL, US

C10G045/04

208/215000, 208/213000, 208/107000

Catalyst particles are presulfided in a treatment zone separate from a hydroconversion reaction zone. The presulfided catalyst is then added to a substantially packed bed of catalyst in the hydroconversion reaction zone at reaction pressure, so that the reactor is not shut down to replace catalyst. The presulfiding process is particularly beneficial for use in moving bed reactors for heavy oil conversion.

20050006283, Jan 13, 2005

May 6, 2004

10/841650

Pak Leung - Lafayette CA, US
David Earls - Pinole CA, US
Bruce Reynolds - Martinez CA, US
David Johnson - Petaluma CA, US
Robert Bachtel - Livermore CA, US
Harold Trimble - Panama City Beach FL, US

C10G045/02
C10G047/06

208213000, 208215000, 20825100H, 20825400H, 208108000

Catalyst particles are presulfided in a pretreatment zone separate from a hydroconversion reaction zone. The presulfided catalyst is then added to a moving bed of catalyst in the hydroconversion reaction zone at reaction pressure, so that the reactor is not shut down to replace catalyst. The presulfiding process is particularly beneficial for use in moving bed reactors for heavy oil conversion.

20060058175, Mar 16, 2006

Sep 10, 2004

10/938202

Kaidong Chen - Albany CA, US
Pak Leung - Lafayette CA, US
Bruce Reynolds - Martinez CA, US

B01J 35/12
B01J 31/00
B01J 27/02

502003000, 502159000, 502216000, 502219000, 502220000, 502221000, 502222000, 502223000

The instant invention is directed to the preparation of a catalyst composition suitable for the hydroconversion of heavy oils. The catalyst composition is prepared by a series of steps, involving mixing a Group VIB metal oxide and aqueous ammonia to form an aqueous mixture, and sulfiding the mixture to form a slurry. The slurry is then promoted with a Group VIII metal. Subsequent steps involve mixing the slurry with a hydrocarbon oil and combining the resulting mixture with hydrogen gas and a second hydrocarbon oil having a lower viscosity than the first oil. An active catalyst composition is thereby formed.