Patents Represented by Attorney Penny L. Prater
  • Patent number: 7396799
    Abstract: The instant invention is directed to the preparation of a slurry catalyst composition. The slurry catalyst composition is prepared in a series of steps, involving mixing a Group VIB metal oxide, particularly molybdenum 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 (under conditions which maintain the water in a liquid phase) to produce the active slurry catalyst.
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: July 8, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kaidong Chen, Bruce E. Reynolds
  • Patent number: 7390394
    Abstract: The invention is directed to a method of making a catalyst comprising an intermediate pore size molecular sieve, preferably a zeolite of the MTT or TON type. SSZ-32 and ZSM-22 are examples of such molecular sieves. This catalyst is modified with a metal or metals selected from the group consisting of Ca, Cr, Mg, La, Ba, Pr, Sr, K and Nd. The catalyst is additionally loaded with a Group VIII metal or metals for hydrogenation purposes. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is isomerized.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: June 24, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Joseph A. Biscardi, Darren P. Fong, Paul Marcantonio
  • Patent number: 7390398
    Abstract: Applicants have developed a new residuum full hydroconversion slurry reactor system that allows the catalyst, unconverted oil and converted oil to circulate in a continuous mixture throughout an entire reactor with no confinement of the mixture. The mixture is partially separated in between the reactors to remove only the products and hydrogen gas, while permitting the unconverted oil and the slurry catalyst to continue on into the next sequential reactor. A portion of the unconverted oil is then converted to lower boiling point hydrocarbons, once again creating a mixture of unconverted oil, products, hydrogen, and slurry catalyst. Further hydroprocessing may occur in additional reactors, fully converting the oil. Additional oil may be added at the interstage feed inlet, possibly in combination with slurry. The oil may alternately be partially converted, leaving a highly concentrated catalyst in unconverted oil which can be recycled directly to the first reactor.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: June 24, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Darush Farshid, Bruce Reynolds
  • Patent number: 7390763
    Abstract: The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomerized product, with increased yield of isomerized material and decreased production of light ends.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: June 24, 2008
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stacey I. Zones, Guang Zhang, Kamala R. Krishna, Joseph A. Biscardi, Paul Marcantonio, Euthimios Vittoratos
  • Patent number: 7238273
    Abstract: 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.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: July 3, 2007
    Assignee: Chevron U.S.A. Inc
    Inventors: Kaidong Chen, Pak C. Leung, Bruce E. Reynolds
  • Patent number: 7238277
    Abstract: In the refining of crude oil, hydroprocessing units such as hydrotreaters and hydrocrackers are used to remove impurities such as sulfur, nitrogen, and metals from the crude oil. They are also used to convert the feed into valuable products such as naphtha, jet fuel, kerosene and diesel. The current invention provides very high to total conversion of heavy oils to products in a single high-pressure loop, using multiple reaction stages. The second stage or subsequent stages may be a combination of co-current and counter-current operation. The benefits of this invention include conversion of feed to useful products at reduced operating pressures using lower catalyst volumes. Lower hydrogen consumption also results. A minimal amount of equipment is employed. Utility consumption is also minimized.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: July 3, 2007
    Assignee: Chevron U.S.A. Inc.
    Inventors: Arthur J. Dahlberg, Ujjal K. Mukherjee, Jerome F. Mayer, Wai Seung W. Louie
  • Patent number: 7214309
    Abstract: 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.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: May 8, 2007
    Assignee: Chevron U.S.A. Inc
    Inventors: Kaidong Chen, Pak C. Leung, Bruce E. Reynolds, Julie Chabot
  • Patent number: 7141529
    Abstract: The invention is directed to a method of making a catalyst comprising an intermediate pore size molecular sieve, preferably a zeolite of the MTT or TON type. SSZ-32 and ZSM-22 are examples of such molecular sieves. This catalyst is modified with a metal or metals selected from the group consisting of Ca, Cr, Mg, La, Ba, Pr, Sr, K and Nd. The catalyst is additionally loaded with a Group VII metal or metals for hydrogenation purposes. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is isomerized.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: November 28, 2006
    Assignee: Chevron U.S.A. Inc.
    Inventors: Joseph A. Biscardi, Darren P. Fong, Paul Marcantonio
  • Patent number: 6841062
    Abstract: This invention relates to a crude oil desulfurization process which comprises hydrodesulfurizing a crude oil feed in a crude desulfurization unit. The desulfurized crude oil is then separated into a light gas oil fraction, a vacuum gas oil fraction and a vacuum residuum fraction. The vacuum gas oil is hydrocracked to form at least one low sulfur fuel product. The light gas oil fraction is hydrotreated. The vacuum gas oil may be hydrocracked in one or more stages. Hydrocracking in the second stage, if present, will convert of at least 20% of the first zone effluent, to create a low sulfur light gas oil fraction. The light gas oil fraction may then be hydrotreated.
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: January 11, 2005
    Assignee: Chevron U.S.A. Inc.
    Inventor: Bruce E. Reynolds
  • Patent number: 6797154
    Abstract: With this invention, high conversion of heavy gas oils and the production of high quality products is possible in a single high-pressure loop with reaction stages operating at different pressure and conversion levels. The flexibility offered is great and will allow the refiner to avoid decrease in product quality while at the same time minimizing capital cost. Feeds with varying boiling ranges can be introduced at different sections of the process, thereby minimizing the consumption of hydrogen and further reducing capital investment.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: September 28, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Ujjal Kumar Mukherjee, Wai Seung W. Louie, Arthur J. Dahlberg
  • Patent number: 6787025
    Abstract: In the refining of crude oil, vacuum gas oil hydrotreaters and hydrocrackers are used to remove impurities such as sulfur, nitrogen, and metals from the crude oil. Typically, the middle distillate boiling material (boiling in the range from 250° F.-735° F.) from VGO hydrotreating or moderate severity hydrocrackers does not meet the smoke point, the cetane number or the aromatic specification. In most cases, this middle distillate is separately upgraded by a middle distillate hydrotreater or, alternatively, the middle distillate is blended into the general fuel oil pool or used as home heating oil. With this invention, the middle distillate is hydrotreated in the same high pressure loop as the vacuum gas oil hydrotreating reactor or the moderate severity hydrocracking reactor.
    Type: Grant
    Filed: December 17, 2001
    Date of Patent: September 7, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Ujjal Kumar Mukherjee, Wai Seung W. Louie, Arthur J. Dahlberg
  • Patent number: 6787026
    Abstract: This invention is directed to a process for hydroprocessing vacuum gas oils and other feeds in order to produce unconverted oil suitable for use as base oil feed for white oils, Group III oils, and BMCI (Bureau of Mines Correlation Index) ethylene plant feed. Ammonia, hydrogen sulfide, and light products are removed from the first stage at high pressure in order to produce a higher quality of unconverted oil that is suitable for Group III base oils.
    Type: Grant
    Filed: October 28, 2002
    Date of Patent: September 7, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventor: Darush Farshid
  • Patent number: 6783660
    Abstract: The instant invention comprises a hydroprocessing method having at least two stages. The first stage employs a hydroprocessing catalyst which may contain hydrotreating catalyst, hydrocracking catalyst, or a combination of both. The second stage is limited to hydrocracking. Conversion in the second stage may be improved by the addition of multiple reaction zones for hydrocracking, with flash separation zones between the stages. Middle distillate yield is thereby increased and the volume of the recycle stream is reduced. This invention reduces the need for equipment which would normally be required for a large recycle stream.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: August 31, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Arthur J. Dahlberg, Jerome F. Mayer
  • Patent number: 6702935
    Abstract: A VGO stream is initially hydrocracked in a hydrocracking reaction zone within an integrated hydroconversion process. Effluent from the hydrocracking reaction zone is combined with a light aromatic-containing feed stream, and the blended stream hydrotreated in a hydrotreating reaction zone. Heat exchange occurs between the hydrocracking reaction zone and the hydrotreating reaction zone, permitting the temperature control of the initial hydrocracking zone. The integrated reaction system provides a single hydrogen supply and recirculation system for use in two reaction processes.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: March 9, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis R. Cash, Arthur J. Dahlberg
  • Patent number: 6632415
    Abstract: An in-extrudate reaction mixture to be effectively crystallized is effectively crystallized to produce zeolitic or non-zeolitic molecular sieves. The reaction mixture is heated within a slowly rotating, double-walled reactor vessel wherein a heated medium is conducted within a space formed between the double walls of the vessel. Thus, the reaction mixture is contacted by a uniformly heated wall while being gently tumbled at low speed. The tumbling action serves to uniformly distribute the heat within the reaction mixture without subjecting the mixture to such shearing that could damage shaped particles. A relatively high quantity of reaction mixture can be handled in that way to maximize the production volumes and reduce production costs.
    Type: Grant
    Filed: April 9, 2001
    Date of Patent: October 14, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventors: Stephen Joseph Miller, Seymour Cherney
  • Patent number: 6630066
    Abstract: This invention is directed to middle distillate production (e.g., diesel and kerosene products) by means of a reactor hydroprocessing system using two or more reactors (or a single reactor vessel having two or more stages, each stage containing one or more reaction zones). Hydrocracking is preferably performed in the initial reactor, and hydrotreating (and/or further hydrocracking) is preferably performed in the subsequent reactor vessel or stages within a single vessel. Reaction stages are effectively segregated to avoid recracking of products, to dramatically reduce hydrogen consumption in saturating the bottoms product and to carry out aromatic saturation of middle distillates in a clean low-temperature environment.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: October 7, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis R. Cash, Arthur J. Dahlberg
  • Patent number: 6623624
    Abstract: An integrated distillate hydrocracking process produces one or more fuel products and one or more lube products from a first reaction stage. Heavy fractions from the first stage, which are not recovered as lube products, are cracked to fuels in a second reaction stage. This invention is intended to provide a full range of lube streams, over a wide viscosity range and a wide viscosity index range, from a fuels hydrocracker, in addition to high yields of high quality fuels.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: September 23, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis R. Cash, Paul D. Cambern
  • Patent number: 6579441
    Abstract: A base oil feed having a tendency to form a haze at ambient or sub-ambient temperatures is contacted with a solid adsorbent to remove at least a portion of the haze precursors, thereby reducing the haze-forming tendency of the base oil feed.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: June 17, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventors: Joseph A. Biscardi, Darren P. Fong
  • Patent number: 6554994
    Abstract: 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.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: April 29, 2003
    Assignee: Chevron U.S.A. Inc.
    Inventors: Bruce E. Reynolds, Fred W. Lam, Julie Chabot, Fernando J. Antezana, Robert Bachtel, Kirk R. Gibson, Richard Threlkel, Pak C. Leung
  • Patent number: 6475463
    Abstract: The present invention relates to new crystalline zeolite SSZ-55 prepared using a phenylcycloalkylmethyl ammonium or N-cyclohexyl-N-(2-methylpropyl)pyrrolidinium cation templating agents.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: November 5, 2002
    Assignee: Chevron U.S.A. Inc.
    Inventors: Saleh Elomari, Thomas V. Harris