Patents by Inventor James N. Ziemer

James N. Ziemer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9115041
    Abstract: A reforming process using a medium pore zeolite under conditions to facilitate the conversion of C8 paraffinic compounds to para-xylene is provided. Para-xylene is produced at greater than thermodynamic equilibrium concentrations using the process.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: August 25, 2015
    Assignee: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer
  • Patent number: 8882992
    Abstract: The present invention relates to a multistage reforming process to produce a high octane product. A naphtha boiling range feedstock is processed in a multi-stage reforming process, in which the process involves at least 1) a penultimate stage for reforming the naphtha feedstock to produce a penultimate effluent 2) a final stage for further reforming at least a portion of the penultimate effluent 3) a regeneration step for the final stage catalyst. The severity of the penultimate stage can be increased during final stage catalyst regeneration in order to maintain the target RON of the reformate product and avoid reactor downtime.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: November 11, 2014
    Assignee: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer
  • Patent number: 8734758
    Abstract: A method for synthesizing a molecular sieve comprising providing a reaction mixture sufficient to synthesize the molecular sieve, maintaining the reaction mixture under crystallization conditions, monitoring at least one viscometric parameter of the reaction mixture, and determining an endpoint based on the monitoring of the at least one viscometric parameter.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: May 27, 2014
    Assignee: Chevron U.S.A. Inc.
    Inventors: James N. Ziemer, Tracy M. Davis, Stacey I. Zones, Adeola Ojo
  • Publication number: 20140114106
    Abstract: A reforming process using a medium pore zeolite under conditions to facilitate the conversion of C8 paraffinic compounds to para-xylene is provided. Para-xylene is produced at greater than thermodynamic equilibrium concentrations using the process.
    Type: Application
    Filed: December 31, 2013
    Publication date: April 24, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer
  • Publication number: 20140076778
    Abstract: The present invention relates to a multistage reforming process to produce a high octane product. A naphtha boiling range feedstock is processed in a multi-stage reforming process, in which the process involves at least 1) a penultimate stage for reforming the naphtha feedstock to produce a penultimate effluent 2) a final stage for further reforming at least a portion of the penultimate effluent 3) a regeneration step for the final stage catalyst. The severity of the penultimate stage can be increased during final stage catalyst regeneration in order to maintain the target RON of the reformate product and avoid reactor downtime.
    Type: Application
    Filed: November 19, 2013
    Publication date: March 20, 2014
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Cong-Yan CHEN, Stephen J. MILLER, James N. ZIEMER
  • Patent number: 8658021
    Abstract: The present invention relates to a multistage reforming process to produce a high octane product. A naphtha boiling range feedstock is processed in a multi-stage reforming process, in which the process involves at least 1) a penultimate stage for reforming the naphtha feedstock to produce a penultimate effluent 2) a final stage for further reforming at least a portion of the penultimate effluent 3) a regeneration step for the final stage catalyst. The severity of the penultimate stage can be increased during final stage catalyst regeneration in order to maintain the target RON of the reformate product and avoid reactor downtime.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: February 25, 2014
    Assignee: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer, Ann J. Liang
  • Publication number: 20140046106
    Abstract: A reforming process using a medium pore zeolite under conditions to facilitate the conversion of C8 paraffinic compounds to para-xylene is provided. Para-xylene is produced at greater than thermodynamic equilibrium concentrations using the process.
    Type: Application
    Filed: October 16, 2013
    Publication date: February 13, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer
  • Patent number: 8545805
    Abstract: The invention is directed to a method for making small crystal zeolites, such as small crystal SSZ-32, in the absence of an amine component.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: October 1, 2013
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stacey I. Zones, Bowman Lee, Lun-Teh Yuen, Tracy M. Davis, James N. Ziemer, Adeola Ojo
  • Patent number: 8524623
    Abstract: A process for regenerating a spent ionic liquid catalyst including (a) applying a voltage across one or more pairs of electrodes immersed in a spent ionic liquid catalyst comprising conjunct polymer-metal halide complexes to provide freed conjunct polymers and a regenerated ionic liquid catalyst; and (b) separating the freed conjunct polymers from the regenerated ionic liquid catalyst is described. An alkylation process incorporating the regeneration process is also described.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: September 3, 2013
    Assignee: Chevron U.S.A. Inc.
    Inventors: Hye-Kyung Timken, Saleh Elomari, Thomas V. Harris, James N. Ziemer
  • Patent number: 8431014
    Abstract: The invention provides for a process for dewaxing a waxy hydrocarbon feedstock to form a lubricant oil. The invention is also directed to a catalyst system comprising a hydrotreating catalyst upstream of a dewaxing catalyst, used in the dewaxing of a waxy hydrocarbon feedstock to form a lubricant oil. In particular, the invention is directed to a process and catalyst system designed to maintain yield of lubricant oil product. Specifically, the yield of lubricant oil does not decrease more than 2%, at a target pour point, over a dewaxing temperature range. The hydrotreating catalyst helps prevent aging of the dewaxing catalyst and maintains lubricant oil product yield at a target pour point over a wide temperature range. The hydrotreating catalyst comprises platinum, palladium, or combinations thereof on a low acidity inorganic oxide support where acidity is measured by a decalin conversion of less than 10% at 700° F.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: April 30, 2013
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kamala R. Krishna, James N. Ziemer, Andrew Rainis, Joseph A. Biscardi, Thomas V. Harris
  • Publication number: 20120114552
    Abstract: A method for synthesizing a molecular sieve comprising providing a reaction mixture sufficient to synthesize the molecular sieve, maintaining the reaction mixture under crystallization conditions, monitoring at least one viscometric parameter of the reaction mixture, and determining an endpoint based on the monitoring of the at least one viscometric parameter.
    Type: Application
    Filed: November 5, 2010
    Publication date: May 10, 2012
    Inventors: James N. Ziemer, Tracy M. Davis, Stacey I. Zones, Adeola Ojo
  • Publication number: 20120114553
    Abstract: The invention is directed to a method for making small crystal zeolites, such as small crystal SSZ-32, in the absence of an amine component.
    Type: Application
    Filed: November 5, 2010
    Publication date: May 10, 2012
    Inventors: Stacey I. Zones, Bowman Lee, Lun-Teh Yuen, Tracy M. Davis, James N. Ziemer, Adeola Ojo
  • Publication number: 20120024752
    Abstract: An integrated process is provided for producing high octane naphtha. Hydrocracked naphtha from a hydrocracking reaction zone is contacted with a reforming catalyst that includes a silicate having a silica to alumina molar ratio of at least 200, and a crystallite size of less than 10 microns. Products from the reforming include a reformed naphtha and a hydrogen-rich stream, which is passed to the hydrocracking reaction zone.
    Type: Application
    Filed: July 28, 2010
    Publication date: February 2, 2012
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer, Ann J. Liang
  • Publication number: 20120024753
    Abstract: The present invention relates to a multistage reforming process to produce a high octane product. A naphtha boiling range feedstock is processed in a multi-stage reforming process, in which said process involves at least 1) a penultimate stage for reforming the naphtha feedstock to produce a penultimate effluent 2) a final stage for further reforming at least a portion of the penultimate effluent 3) a regeneration step for the final stage catalyst. The severity of the penultimate stage can be increased during final stage catalyst regeneration in order to maintain the target RON of the reformate product and avoid reactor downtime.
    Type: Application
    Filed: July 28, 2010
    Publication date: February 2, 2012
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer, Ann J. Liang
  • Publication number: 20120029257
    Abstract: A reforming process using a medium pore zeolite under conditions to facilitate the conversion of C8 paraffinic compounds to para-xylene is provided. Para-xylene is produced at greater than thermodynamic equilibrium concentrations using the process.
    Type: Application
    Filed: July 28, 2010
    Publication date: February 2, 2012
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer, Ann J. Liang
  • Publication number: 20120024754
    Abstract: The present invention relates to a multistage reforming process to produce a high octane product. A naphtha boiling range feedstock is processed in a multi-stage reforming process, in which said process involves at least 1) a penultimate stage for reforming the naphtha feedstock to produce a penultimate effluent 2) a final stage for further reforming at least a portion of the penultimate effluent 3) a regeneration step for the final stage catalyst. The severity of the penultimate stage can be increased during final stage catalyst regeneration in order to maintain the target RON of the reformate product and avoid reactor downtime.
    Type: Application
    Filed: July 28, 2010
    Publication date: February 2, 2012
    Inventors: Cong-Yan Chen, Stephen J. Miller, James N. Ziemer, Ann J. Liang
  • Publication number: 20110079540
    Abstract: The invention provides for a process for dewaxing a waxy hydrocarbon feedstock to form a lubricant oil. The invention is also directed to a catalyst system comprising a hydrotreating catalyst upstream of a dewaxing catalyst, used in the dewaxing of a waxy hydrocarbon feedstock to form a lubricant oil. In particular, the invention is directed to a process and catalyst system designed to maintain yield of lubricant oil product. Specifically, the yield of lubricant oil does not decrease more than 2%, at a target pour point, over a dewaxing temperature range. The hydrotreating catalyst helps prevent aging of the dewaxing catalyst and maintains lubricant oil product yield at a target pour point over a wide temperature range. The hydrotreating catalyst comprises platinum, palladium, or combinations thereof on a low acidity inorganic oxide support where acidity is measured by a decalin conversion of less than 10% at 700° F.
    Type: Application
    Filed: October 6, 2009
    Publication date: April 7, 2011
    Inventors: Kamala R. Krishna, James N. Ziemer, Andrew Rainis, Joseph A. Biscardi, Thomas V. Harris
  • Publication number: 20100130804
    Abstract: A process for regenerating a spent ionic liquid catalyst including (a) applying a voltage across one or more pairs of electrodes immersed in a spent ionic liquid catalyst comprising conjunct polymer-metal halide complexes to provide freed conjunct polymers and a regenerated ionic liquid catalyst; and (b) separating the freed conjunct polymers from the regenerated ionic liquid catalyst is described. An alkylation process incorporating the regeneration process is also described.
    Type: Application
    Filed: May 7, 2009
    Publication date: May 27, 2010
    Inventors: Hye-Kyung C. Timken, Saleh Elomari, Thomas V. Harris, James N. Ziemer
  • Publication number: 20090301933
    Abstract: The present invention is a multistage reforming process to produce high octane product from naphtha boiling range feed. In the process, a effluent product from a penultimate reforming stage is separated into at least a first stream and a second stream by boiling point. The lower boiling of the two streams is further reformed in a final reforming stage over a medium pore molecular sieve catalyst.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 10, 2009
    Inventors: Stephen Joseph Miller, Cong-Yan Chen, Brian C. Adams, James N. Ziemer
  • Publication number: 20090301934
    Abstract: The present invention relates to a multistage reforming process to produce a high octane product. A naphtha boiling range feedstock is processed in a multi-stage reforming process, in which said process involves at least 1) a penultimate stage for reforming the naphtha feedstock to produce a penultimate effluent 2) a separation step for separating the penultimate effluent into at least an intermediate stream and a heavy stream based on boiling point and 3) a final stage for further reforming the intermediate stream.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 10, 2009
    Inventors: Stephen Joseph Miller, Cong-Yan Chen, Brian C. Adams, James N. Ziemer