Patents by Inventor Viorel Duma

Viorel Duma 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: 11951458
    Abstract: Bulk catalysts comprised of nickel, molybdenum, tungsten and titanium and methods for synthesizing bulk catalysts are provided. The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.
    Type: Grant
    Filed: June 29, 2023
    Date of Patent: April 9, 2024
    Assignee: Chevron U.S.A. Inc.
    Inventors: Xiaoying Ouyang, Viorel Duma, Alexander Kuperman, Ibrahim Uckung, Theodorus Ludovicus Michael Maesen, Axel Brait, Charles Wilson
  • Publication number: 20240084205
    Abstract: Described herein is a hydrocracking catalyst and process that may be used to make middle distillates and unconverted oil having beneficial yield and product characteristics. The process generally comprises contacting a hydrocarbon feed with the hydrocracking catalyst under hydrocracking conditions to produce a product comprising middle distillates and unconverted oil products. The hydrocracking catalyst comprises an SSZ-91 molecular sieve and a modifying metal selected from one or more Group 6 metals, and, optionally, one or more Group 8 to 10 metals, or a modifying metal selected from Group 8 to 10 metals and combinations thereof, and, optionally, one or more Group 6 metals. The hydrocracking catalyst may comprise a matrix material and/or an additional zeolite.
    Type: Application
    Filed: January 17, 2022
    Publication date: March 14, 2024
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Viorel DUMA, Theodorus Ludovicus Michael MAESEN, Hyungjae Alexander YOON
  • Publication number: 20230347324
    Abstract: Bulk catalysts comprised of nickel, molybdenum, tungsten and titanium and methods for synthesizing bulk catalysts are provided. The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.
    Type: Application
    Filed: June 29, 2023
    Publication date: November 2, 2023
    Applicant: Chevron U.S.A. Inc.
    Inventors: Xiaoying OUYANG, Viorel DUMA, Alexander KUPERMAN, Ibrahim UCKUNG, Theodorus Ludovicus Michael MAESEN, Axel BRAIT, Charles WILSON
  • Patent number: 11731112
    Abstract: Bulk catalysts comprised of nickel, molybdenum, tungsten and titanium and methods for synthesizing bulk catalysts are provided. The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.
    Type: Grant
    Filed: March 3, 2021
    Date of Patent: August 22, 2023
    Assignee: Chevron U.S.A. Inc.
    Inventors: Xiaoying Ouyang, Viorel Duma, Alexander Kuperman, Ibrahim Uckung, Theodorus Ludovicus Michael Maesen, Axel Brait, Charles Wilson
  • Publication number: 20210339232
    Abstract: Bulk catalysts comprised of nickel, molybdenum, tungsten and titanium and methods for synthesizing bulk catalysts are provided. The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.
    Type: Application
    Filed: March 3, 2021
    Publication date: November 4, 2021
    Inventors: Xiaoying OUYANG, Viorel DUMA, Alexander KUPERMAN, Ibrahim UCKUNG, Theodorus Ludovicus Michael MAESEN, Axel BRAIT, Charles WILSON
  • Patent number: 11041128
    Abstract: A catalyst system has been designed that disrupts the sedimentation process. The catalyst system achieves this by saturating key feed components before the feed components are stripped into their incompatible aromatic cores. The efficacy of this disruptive catalyst system is particularly evident in a hydrocracker configuration that runs in two-stage-recycle operation. The catalyst is a self-supported multi-metallic catalyst prepared from a precursor in the hydroxide form, and the catalyst must be toward the top level of the second stage of the two-stage system.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: June 22, 2021
    Assignee: Chevron U.S.A. Inc.
    Inventors: Theodorus Ludovicus Michael Maesen, Derek Blackwell, Viorel Duma, Varut Komalarajun, Alexander E. Kuperman, Hyunuk Ryu, Horacio Trevino, Alex Yoon, Ujjal Mukherjee
  • Patent number: 11000839
    Abstract: Provided is a hydro-regeneration catalyst system, comprising: (a) a first graded bed comprising a guard bed material; and (b) a second graded bed, fluidly connected to the first graded bed, comprising a noble metal catalyst on a support having mesopores and macropores; wherein the noble metal catalyst has an average pore diameter of 20 to 1,000 nm (0.02 to 1 ?m), a total pore volume of greater than 0.80 cc/g, and a macropore volume of 0.10 to 0.50 cc/g. Also provided is a guard bed system, comprising: (a) a first guard bed comprising a first adsorbent having 10 ?m or larger pores with an average pore diameter of 100 to 1,000 ?m; and (b) a second guard bed fluidly connected to the first guard bed, comprising a second adsorbent material having mesopores and macropores with a second average pore diameter of 20 to 1,000 nm.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: May 11, 2021
    Assignee: Chevron U.S.A. Inc.
    Inventors: Hye Kyung Cho Timken, Jeff Johns, Rahul Shankar Bhaduri, Viorel Duma, John V. Heyse
  • Patent number: 10968405
    Abstract: A catalyst system has been designed that disrupts the sedimentation process. The catalyst system achieves this by saturating key feed components before the feed components are stripped into their incompatible aromatic cores. The efficacy of this disruptive catalyst system is particularly evident in a hydrocracker configuration that runs in two-stage-recycle operation. The catalyst is a self-supported multi-metallic catalyst prepared from a precursor in the hydroxide form, and the catalyst must be toward the top level of the second stage of the two-stage system.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: April 6, 2021
    Assignee: Chevron U.S.A. Inc.
    Inventors: Theodoras Ludovicus Michael Maesen, Derek Blackwell, Viorel Duma, Varut Komalarajun, Alexander E. Kuperman, Hyunuk Ryu, Horacio Trevino, Alex Yoon, Ujjal Mukherjee
  • Publication number: 20200347309
    Abstract: A catalyst system has been designed that disrupts the sedimentation process. The catalyst system achieves this by saturating key feed components before the feed components are stripped into their incompatible aromatic cores. The efficacy of this disruptive catalyst system is particularly evident in a hydrocracker configuration that runs in two-stage-recycle operation. The catalyst is a self-supported multi-metallic catalyst prepared from a precursor in the hydroxide form, and the catalyst must be toward the top level of the second stage of the two-stage system.
    Type: Application
    Filed: August 6, 2019
    Publication date: November 5, 2020
    Applicant: Chevron U.S.A. Inc.
    Inventors: Theodorus Ludovicus Michael MAESEN, Derek BLACKWELL, Viorel DUMA, Varut KOMALARAJUN, Alexander E. KUPERMAN, Hyunuk RYU, Horacio TREVINO, Alex YOON, Ujjal MUKHERJEE
  • Publication number: 20200102509
    Abstract: Provided herein is a process for separating alkane isomers from a hydrocarbon mixture in an integrated refining unit, comprising: passing the hydrocarbon mixture through a normal alkane-selective membrane in a single stage to produce a normal alkane-enriched stream and a membrane reject stream; and feeding the normal alkane-enriched stream to a steam cracker to produce olefins; wherein the hydrocarbon mixture comprises n-paraffins and at least two of isoparaffins, cycloparaffins, and aromatics.
    Type: Application
    Filed: September 27, 2019
    Publication date: April 2, 2020
    Inventors: Nitesh Bhuwania, Viorel Duma, Daniel Chinn, Theodorus Ludovicus Michael Maesen
  • Publication number: 20200048566
    Abstract: A catalyst system has been designed that disrupts the sedimentation process. The catalyst system achieves this by saturating key feed components before the feed components are stripped into their incompatible aromatic cores. The efficacy of this disruptive catalyst system is particularly evident in a hydrocracker configuration that runs in two-stage-recycle operation. The catalyst is a self-supported multi-metallic catalyst prepared from a precursor in the hydroxide form, and the catalyst must be toward the top level of the second stage of the two-stage system.
    Type: Application
    Filed: August 6, 2019
    Publication date: February 13, 2020
    Applicant: Chevron U.S.A. Inc.
    Inventors: Theodorus Ludovicus Michael MAESEN, Derek BLACKWELL, Viorel DUMA, Varut KOMALARAJUN, Alexander E. KUPERMAN, Hyunuk RYU, Horacio TREVINO, Alex YOON, Ujjal MUKHERJEE
  • Patent number: 10279335
    Abstract: Spheroidal catalyst support, supported catalyst, and method of preparing and using the catalyst for hydrodemetallation of metal-containing heavy oil feedstocks are disclosed. The catalyst supports comprise titania alumina having 5 wt % or less titania and have greater than 30% percent of their pore volume in pores having a diameter of between 200 and 500 ?. Catalysts prepared from the supports contain Group 6, 9 and 10 metals or metal compounds supported on the titania alumina supports. Catalysts in accordance with the invention exhibit improved catalytic activity and stability to remove metals from heavy feedstocks during a hydrotreating process. The catalysts also provide increased sulfur and MCR conversion during a hydrotreating process.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: May 7, 2019
    Assignee: Advanced Refining Technologies LLC
    Inventors: Stanislaw Plecha, Narinobu Kagami, Viorel Duma, John Everett Creighton
  • Publication number: 20180353945
    Abstract: The present disclosure provides a macroporous noble metal catalyst and processes employing such catalysts for the regeneration of deactivated ionic liquid catalyst containing conjunct polymer.
    Type: Application
    Filed: January 10, 2018
    Publication date: December 13, 2018
    Inventors: Hye Kyung Cho Timken, Jeff Johns, Rahul Shankar Bhaduri, Viorel Duma, John V. Heyse
  • Patent number: 9956553
    Abstract: The present disclosure provides a macroporous noble metal catalyst and processes employing such catalysts for the regeneration of deactivated ionic liquid catalyst containing conjunct polymer.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: May 1, 2018
    Assignee: Chevron U.S.A. Inc.
    Inventors: Hye Kyung Cho Timken, Jeff Johns, Rahul Shankar Bhaduri, Viorel Duma, John V. Heyse
  • Publication number: 20170368544
    Abstract: The present disclosure provides a macroporous noble metal catalyst and processes employing such catalysts for the regeneration of deactivated ionic liquid catalyst containing conjunct polymer.
    Type: Application
    Filed: June 28, 2016
    Publication date: December 28, 2017
    Inventors: Hye Kyung Cho Timken, Jeff Johns, Rahul Shankar Bhaduri, Viorel Duma, John V. Heyse
  • Publication number: 20150224476
    Abstract: Spheroidal catalyst support, supported catalyst, and method of preparing and using the catalyst for hydrodemetallation of metal-containing heavy oil feedstocks are disclosed. The catalyst supports comprise titania alumina having 5 wt % or less titania and have greater than 30% percent of their pore volume in pores having a diameter of between 200 and 500 ?. Catalysts prepared from the supports contain Group 6, 9 and 10 metals or metal compounds supported on the titania alumina supports. Catalysts in accordance with the invention exhibit improved catalytic activity and stability to remove metals from heavy feedstocks during a hydrotreating process. The catalysts also provide increased sulfur and MCR conversion during a hydrotreating process.
    Type: Application
    Filed: February 15, 2013
    Publication date: August 13, 2015
    Inventors: Stanislaw Plecha, Narinobu Kagami, Viorel Duma, John Everett Creighton
  • Patent number: 6392065
    Abstract: The invention relates to a method of producing epoxy resins from hydrocarbons with olefinic double bonds, especially alkenes, by heterogeneous catalyzed oxidation in the gaseous phase. According to said method, and oxidic solid catalyst is released which contains iron as its active component at a concentration of 0.001-1% and alkali and/or alkaline earth elements as the promoters. N2O is used as the oxidizing agent. The granulated oxidic solid catalyst, especially on the basis of SiO2 as the carrier, has a specific surface of greater that 50 m2/g. The ratio of the concentrations of the active components to the promoter components is preferably between 1:100 and 10:1. The partial oxidation of hydrocarbons with olefinic double bonds, especially propene, results in propene selectivities of 10-70% at reaction temperatures of 300-500° C. and conversions of 2-30%.
    Type: Grant
    Filed: July 26, 2000
    Date of Patent: May 21, 2002
    Assignee: Creavis Gesellschaft fuer Technologie und Innovation mbH
    Inventors: Dieter Hönicke, Viorel Duma, Waldemar Krysmann