Patents by Inventor David L. Stern

David L. Stern 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: 9109176
    Abstract: This invention relates to low sulfur marine/bunker fuel compositions and methods of making same. Contrary to conventional marine/bunker fuel compositions/methods, the inventive lower sulfur compositions/methods focus on use of mostly uncracked components, such as (cat feed) hydrotreated gasoils, and/or can also have reduced contents of residual components.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: August 18, 2015
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: David L. Stern, Salvatore R. Di Mauro, Aldo Roccaro, Paul W. Bessonette
  • Patent number: 8518244
    Abstract: This invention relates to an improved hydrotreating process for removing sulfur from naphtha and distillate feedstreams. This improved process utilizes a hydrotreating zone, an acid gas removal zone, and a pressure swing adsorption zone having a total cycle time of less than about 30 seconds for increasing the concentration of hydrogen utilized in the process.
    Type: Grant
    Filed: January 23, 2006
    Date of Patent: August 27, 2013
    Assignee: Exxonmobil Research and Engineering Company
    Inventors: James J. Schorfheide, Sean C. Smyth, Bal K. Kaul, David L. Stern
  • Publication number: 20120246999
    Abstract: This invention relates to low sulfur marine/bunker fuel compositions and methods of making same. Contrary to conventional marine/bunker fuel compositions/methods, the inventive lower sulfur compositions/methods focus on use of mostly uncracked components, such as (cat feed) hydrotreated gasoils, and/or can also have reduced contents of residual components.
    Type: Application
    Filed: March 27, 2012
    Publication date: October 4, 2012
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: David L. Stern, Salvatore R. Di Mauro, Aldo Roccaro, Paul W. Bessonette
  • Patent number: 8187456
    Abstract: An improved process for hydrocracking heavy petroleum feedstocks wherein hydrogen-containing streams associated with a hydrocracker are subjected to rapid cycle pressure swing adsorption having a cycle time of less than 30 S.
    Type: Grant
    Filed: January 23, 2006
    Date of Patent: May 29, 2012
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: John W. Viets, Narasimhan Sundaram, Bal K. Kaul, David L. Stern
  • Patent number: 8114195
    Abstract: A porous crystalline material has a tetrahedral framework comprising a general structure, M1-IM-M2, wherein M1 comprises a metal having a first valency, wherein M2 comprises a metal having a second valency different from said first valency, and wherein IM is imidazolate or a substituted imidazolate linking moiety.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: February 14, 2012
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Zheng Ni, John Zengel, David L. Stern
  • Patent number: 7959720
    Abstract: The present invention relates to engineered structured adsorbent contactors for use in pressure swing adsorption and thermal swing adsorption processes. Preferably, the contactors contain engineered and substantially parallel flow channels wherein 20 volume percent or less of the open pore volume of the contactor, excluding the flow channels, is in the mesopore and macropore range.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: June 14, 2011
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Harry W. Deckman, Ronald R. Chance, Edward W. Corcoran, Jr., David L. Stern
  • Publication number: 20110100873
    Abstract: An improved process for hydrocracking heavy petroleum feedstocks wherein hydrogen-containing streams associated with a hydrocracker are subjected to rapid cycle pressure swing adsorption having a cycle time of less than 30 S.
    Type: Application
    Filed: January 23, 2006
    Publication date: May 5, 2011
    Inventors: John W. Viets, Narasimhan Sundaram, Bal K. Kaul, David L. Stern
  • Patent number: 7892323
    Abstract: The management of hydrogen in hydrogen-containing streams associated with petrochemical process units wherein the hydrogen-containing stream is subjected rapid cycle pressure swing adsorption to increase the concentration of hydrogen therein.
    Type: Grant
    Filed: January 23, 2006
    Date of Patent: February 22, 2011
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: David L. Stern, Bal K. Kaul, John Di-Yi Ou, Dana L. Pilliod
  • Publication number: 20100307336
    Abstract: A porous crystalline material has a tetrahedral framework comprising a general structure, M1-IM-M2, wherein M1 comprises a metal having a first valency, wherein M2 comprises a metal having a second valency different from said first valency, and wherein IM is imidazolate or a substituted imidazolate linking moiety.
    Type: Application
    Filed: June 5, 2009
    Publication date: December 9, 2010
    Inventors: Zheng Ni, John Zengel, David L. Stern
  • Patent number: 7803276
    Abstract: This invention relates to a process for recycling acid used to remove nitrogen contaminants from hydrocarbons using polymeric membranes to separate spent acid from the acid extraction of hydrocarbons into acid for recycle and acid for regeneration.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: September 28, 2010
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Bhupender S. Minhas, Dennis G. Peiffer, Jeffrey S. Beck, David L. Stern, Tomas R. Melli
  • Publication number: 20100108571
    Abstract: This invention relates to an improved hydrotreating process for removing sulfur from naphtha and distillate feedstreams. This improved process utilizes a hydrotreating zone, an acid gas removal zone, and a pressure swing adsorption zone having a total cycle time of less than about 30 seconds for increasing the concentration of hydrogen utilized in the process.
    Type: Application
    Filed: January 23, 2006
    Publication date: May 6, 2010
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING CO.
    Inventors: James J. Schorfheide, Sean C. Smyth, Bal K. Kaul, David L. Stern
  • Patent number: 7615143
    Abstract: There is provided a catalyst composition having improved hydrothermal stability for the catalytic cracking of a hydrocarbon feedstock to selectively produce propylene. The catalyst composition comprises a first crystalline molecular sieve selected from the group consisting of IM-5, MWW, ITH, FER, MFS, AEL, and AFO and an effective amount of a stabilization metal (copper, zirconium, or mixtures thereof) exchanged into the molecular sieve. The catalyst finds application in the cracking of naphtha and heavy hydrocarbon feedstocks. When used in the catalytic cracking of heavier hydrocarbon feedstocks, the catalyst composition preferably comprises a second molecular sieve having a pore size that is greater than the pore size of the first molecular sieve. The process is carried out by contacting a feedstock containing hydrocarbons having at least 4 carbon atoms is contacted, under catalytic cracking conditions, with the catalyst composition.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: November 10, 2009
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Tan-Jen Chen, Paul F. Keusenkothen, J. Jason Wu, John Scott Buchanan, Guang Cao, Larry L. Iaccino, David L. Stern, Matthew J. Vincent
  • Patent number: 7553790
    Abstract: The present invention describes a method to increase the activity of a catalyst by first performing an ion exchange step with a potassium ion, followed by performing an ion-exchange step with an ammonium ion. Specifically, the present invention describes a method to increase the acidity of a zeolite by incorporating a potassium salt ion-exchange prior to an ammonium salt ion-exchange step. Even more specifically, the present invention is drawn to a method of increasing the activity of a zeolite by employing more than one potassium ion exchanges followed by at least one ammonium ion exchange. The present invention also describes a method to reduce the amount of sodium normally found in commercially produced zeolite by employing any of these methods. The present invention is also drawn to the catalysts produced by any of these methods.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: June 30, 2009
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Jean W. Beeckman, Glenn R. Sweeten, Daria N. Lissy, David L. Stern, Stephen J. McCarthy, Dominick N. Mazzone, Christine N. Elia
  • Publication number: 20090139900
    Abstract: This invention relates to a FCC process using a mesoporous catalytic cracking catalyst. The mesoporous fluidized catalytic cracking catalyst is selective for minimizing the production of coke and light gas. The catalyst comprises at least one amorphous, porous matrix, each matrix having pores ranging in diameter from about 1 ? to about 10 ? and pores ranging in diameter from about 40 ? to about 500 ?, wherein in the pore range from 50 ? to 250 ?, there is a single maximum in differential pore volume distribution over the 50 ? to 250 ? range.
    Type: Application
    Filed: February 3, 2009
    Publication date: June 4, 2009
    Inventors: William A. Wachter, Stephen J. McCathy, Jeffrey S. Beck, David L. Stern
  • Publication number: 20090120839
    Abstract: Improved hydroprocessing processes for upgrading refinery streams via the use of rapid cycle pressure swing absorption having a cycle time of less than 30 s for increasing the concentration of hydrogen in the vapor phase product recycled to the hydroprocessing zone.
    Type: Application
    Filed: January 23, 2006
    Publication date: May 14, 2009
    Inventors: Craig Y. Sabottke, Edward W. Corcoran, Richard L. Eckes, Bal K. Kaul, Narasimhan Sundaram, James J. Schorfheide, Sean C. Smyth, David L. Stern
  • Patent number: 7504021
    Abstract: This invention relates to a FCC process using a mesoporous catalytic cracking catalyst. The mesoporous fluidized catalytic cracking catalyst is selective for minimizing the production of coke and light gas. The catalyst comprises at least one amorphous, porous matrix, each matrix having pores ranging in diameter from about 1 ? to about 10 ? and pores ranging in diameter from about 40 ? to about 500 ?, wherein in the pore range from 50 ? to 250 ?, there is a single maximum in differential pore volume distribution over the 50 ? to 250 ? range.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: March 17, 2009
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: William A. Wachter, Stephen J. McCarthy, Jeffrey S. Beck, David L. Stern
  • Patent number: 7485763
    Abstract: In a process for converting C9+ aromatic hydrocarbons to lighter aromatic products a feed comprising C9+ aromatic hydrocarbons is contacted under transalkylation reaction conditions with a catalyst composition comprising (i) a first molecular sieve selected from the group consisting of ZSM-12, mordenite and a porous crystalline inorganic oxide material having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07 and 3.42±0.07; and (ii) a second molecular sieve having a constraint index ranging from 3 to 12. At least the first molecular sieve has a hydrogenation component associated therewith and the first and second molecular sieves are contained in the same catalyst bed. The C9+ aromatic hydrocarbons are converted under the transalkylation reaction conditions to a reaction product containing xylene.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: February 3, 2009
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: John Scott Buchanan, Ronald J. Cimini, Robert A. Crane, Wenyih F. Lai, Jose G. Santiesteban, David A. Stachelczyk, David L. Stern, Hye-Kyung C. Timken, William A. Weber
  • Publication number: 20090007782
    Abstract: The management of hydrogen in hydrogen-containing streams associated with petrochemical process units wherein the hydrogen-containing stream is subjected rapid cycle pressure swing adsorption to increase the concentration of hydrogen therein.
    Type: Application
    Filed: January 23, 2006
    Publication date: January 8, 2009
    Inventors: David L. Stern, Bal K. Kaul, John Di-Yi Ou, Dana L. Pilliod
  • Publication number: 20080282892
    Abstract: The present invention relates to engineered structured adsorbent contactors for use in pressure swing adsorption and thermal swing adsorption processes. Preferably, the contactors contain engineered and substantially parallel flow channels wherein 20 volume percent or less of the open pore volume of the contactor, excluding the flow channels, is in the mesopore and macropore range.
    Type: Application
    Filed: April 4, 2008
    Publication date: November 20, 2008
    Inventors: Harry W. Deckman, Ronald R. Chance, Edward W. Corcoran, JR., David L. Stern
  • Publication number: 20080237129
    Abstract: This invention relates to a process for recycling acid used to remove nitrogen contaminants from hydrocarbons using polymeric membranes to separate spent acid from the acid extraction of hydrocarbons into acid for recycle and acid for regeneration.
    Type: Application
    Filed: December 1, 2004
    Publication date: October 2, 2008
    Applicant: ExxonMobil Research and Engineering Company
    Inventors: Bhupender S. Minhas, Dennis G. Peiffer, Jeffrey S. Beck, David L. Stern, Tomas R. Melli