Patents Represented by Attorney Penny L. Prater
  • Patent number: 6468417
    Abstract: A dewaxed oil 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 dewaxed oil.
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: October 22, 2002
    Assignee: Chevron U.S.A. Inc.
    Inventors: Joseph A. Biscardi, Kamala R. Krishna, John M. Rosenbaum, Nadine L. Yenni, R. Larry Howell
  • Patent number: 6468418
    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: October 22, 2002
    Assignee: Chevron U.S.A. Inc.
    Inventors: Joseph A. Biscardi, Kamala R. Krishna, John M. Rosenbaum, Nadine L. Yenni, R. Larry Howell, Krishnia Parimi
  • Patent number: 6337010
    Abstract: A process for the production of a UV stable lubricating base oil from a waxy hydrocarbon feedstock comprising the steps of hydrocracking the feedstock; dewaxing the intermediate feedstock from the hydrocracking zone under low pressure; and stabilizing the dewaxed lubricating base oil under high pressure in a hydrofinishing zone.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: January 8, 2002
    Assignee: Chevron U.S.A. Inc.
    Inventor: Kevin L. Hofer
  • Patent number: 6261534
    Abstract: The invention includes a method for preparing a crystalline zeolite having the X-ray diffraction lines of Table 1. The method includes preparing a template-free reaction mixture including at least one active source of a first oxide selected from the group consisting of an oxide of silicon, germanium or both, optionally at least one active source of a second oxide selected from the group consisting of an oxide of aluminum, boron, gallium, iron or a mixture thereof; and heating the reaction mixture at crystallization conditions for sufficient time to form a crystallized material containing zeolite crystals having the X-ray diffraction lines of Table 1, where said zeolite crystals have a first oxide/second oxide molar ratio greater than 12.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: July 17, 2001
    Assignee: Chevron U.S.A. Inc.
    Inventor: Stephen J. Miller
  • Patent number: 6224747
    Abstract: A VGO stream is hydrocracking 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. The hydrocracked effluent serves as a heat sink for the hydrotreating reaction zone. The integrated reaction system provides a single hydrogen supply and recirculation system for use in two reaction systems.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: May 1, 2001
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis R. Cash, Arthur J. Dahlberg
  • Patent number: 6200462
    Abstract: A process for reverse gas flow to obtain high conversion, selective hydrotreating and product selectivity in hydroprocessing reactor systems is disclosed. In the integrated process, hydrogen recovered from a hydrotreating reactor is purified and used as a source of hydrogen for a hydrocracking reaction zone. Hydrogen recovered from the hydrocracking reaction zone is recovered without substantial cooling and used as a source of hydrogen for the hydrotreating reaction zone.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: March 13, 2001
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis R. Cash, Hyung-Jae A. Yoon
  • Patent number: 6179995
    Abstract: An integrated residuum hydroconversion process which includes a residuum hydrotreater and a desulfurized oil hydrocracker produces high quantities of high quality middle distillate fuels. Distillate range products from the residuum hydrotreater are hydrocracked, while catalyst fouling from heavy aromatics present in the hydrotreated products is minimized. The process includes a single hydrogen supply and recovery loop for increased cost and energy savings.
    Type: Grant
    Filed: January 8, 1999
    Date of Patent: January 30, 2001
    Assignee: Chevron U.S.A. Inc.
    Inventors: Dennis R. Cash, Martin J. Armstrong
  • Patent number: 6042719
    Abstract: Low sulfur gasoline of relatively high octane-barrel value is produced from cracked, sulfur containing olefinic naphthas by hydrodesulfurization at low temperature and low space velocity over either a conventional catalyst, such as CoMo/Al.sub.2 O.sub.3, or a dual functional catalyst, such as CoMo ZSM-5/Al.sub.2 O.sub.3. This approach also minimizes the olefins/hydrogen sulfide re-combination frequently observed at high temperature. The process produces a gasoline having a reduced sulfur content with a less than 5% change in motor octane number and a less than 10% change in research octane number.
    Type: Grant
    Filed: November 16, 1998
    Date of Patent: March 28, 2000
    Assignee: Mobil Oil Corporation
    Inventor: Stuart S. Shih
  • Patent number: 6030597
    Abstract: This invention is directed to an improved process for conversion of H2S to sulfur, using MOST(Mobil Offgas Sulfur Treatment) catalyst or sorbent. The sorbent is typically a magnesium-aluminate spinet, with oxidation promoters such as ceria and vanadia. H.sub.2 S from the feed gas is used to regenerate sulfated sorbent, simultaneously producing elemental sulfur which is then condensed out. The improvement involves combusting part of the feed, converting some of the feed H.sub.2 S to SO.sub.2 prior to contacting the sulfated sorbent. Thus much of the stoichiometric oxygen required for conversion of H.sub.2 S to S is supplied in the form of SO.sub.2 by this pre-combustion step, instead of coming totally from the oxidized/sulfated solid sorbent. This can decrease the amount of sorbent required, as well as the frequency of regenerations, thus reducing process cost. The hot combustion gas also helps to heat the feed stream.
    Type: Grant
    Filed: January 7, 1998
    Date of Patent: February 29, 2000
    Assignee: Mobil Oil Corporation
    Inventors: John S. Buchanan, Khushrav E. Nariman
  • Patent number: 6027704
    Abstract: This invention describes a process for the scrubbing of sulfur oxides from the effluent of conventional wet lime/limestone SOx reduction processes in coal or oil-fired plants. The sulfur oxides are oxidatively sorbed onto solid sorbents such as magnesium aluminate spinel. Reduction with the appropriate reducing gases (such as hydrogen) regenerates the catalyst, also yielding a process stream concentrated in SOx. This concentrated SOx stream can then be refed to the front end of the coal or oil-fired plants, with the SOx thus produced ultimately being removed in the conventional wet scrubbing technology.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: February 22, 2000
    Assignee: Mobil Oil Corporation
    Inventors: David L. Johnson, Khushrav E. Nariman, David L. Stern
  • Patent number: 6017443
    Abstract: A method and reactor for catalytic hydroprocessing liquid hydrocarbon feedstock at elevated temperatures and pressures for producing a liquid hydrocarbon product involves introducing the feedstock into a reactor having upper and lower reaction zones, each reaction zone having a hydroprocessing catalyst bed therein, the feedstock being introduced at the top of the lower reaction zone for downward flow through and reaction within the catalyst bed therein; collecting a partially reacted liquid effluent from the lower reaction zone; pumping the partially reacted liquid effluent to and introducing it at the top of the upper reaction zone for downward flow through and reaction within the catalyst bed therein; introducing hydrogen gas at the top of the upper reaction zone for flow downwardly and sequentially through and over the catalyst beds in the upper and lower reaction zones in co-current contact with the liquid in the reaction zones, the hydrogen reacting with the liquid in the reaction zones whereby the liqui
    Type: Grant
    Filed: February 5, 1998
    Date of Patent: January 25, 2000
    Assignee: Mobil Oil Corporation
    Inventor: John S. Buchanan
  • Patent number: 6002059
    Abstract: The invention discloses a method for converting methane to higher order hydrocarbons. This method includes synthesizing ammonia from natural gas and nitrogen in the presence of a source of hydrogen. The ammonia is converted to nitrous oxide in the presence of a source of oxygen. Methane is coupled in the presence of the nitrous oxide to provide higher hydrocarbons. The invention also discloses a method of balancing reaction heat requirements in a process for converting methane to higher order hydrocarbons.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: December 14, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Stuart D. Hellring, Scott A. Stevenson
  • Patent number: 5976351
    Abstract: This invention discloses a process for producing a high Viscosity Index lubricant having a VI of at least 125 from a waxy hydrocarbon feed having a wax content of at least 40 wt %. The process comprises catalytically dewaxing waxy paraffins present in the feed by isomerization in the presence of hydrogen and in the presence of a low acidity large pore zeolite isomerization catalyst. This catalyst has a ratio of SiO.sub.2 /Al.sub.2 O.sub.3, as synthesized, of at least 50:1, and an alpha value of not greater than 20, wherein the catalyst is prepared in the absence of boron. The catalyst further comprises a noble metal hydrogenation component. The feed may be hydrocracked prior to dewaxing with the large pore zeolite. The feed may be solvent dewaxed prior to isomerization. The effluent of the isomerization step may also be further dewaxed by either solvent or catalytic means in order to achieve target pour point.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: November 2, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Minas Robert Apelian, William S. Borghard, Thomas Francis Degnan, Jr., Robert Tryon Hanlon, Mae Koenig Rubin
  • Patent number: 5972171
    Abstract: De-entrainment devices are provided for separating an entrained liquid from a vapor stream exiting a flash zone in a separation column. Methods for utilizing the de-entrainment devices are also provided. In one embodiment, the de-entrainment device of the present invention is embodied in a de-entrainment tray that has a tray deck and a plurality of risers extending vertically up from the tray deck. The risers are provided with devices for imparting rotational movement to the fluid stream, which have the vapor stream and entrained liquid, entering the riser. The rotational movement imparted to the fluid stream causes the liquid to separate from the vapor stream and to flow upward along the riser walls. The de-entrained liquid is then transported from above the separation tray back into the flash zone by way of a liquid downcomer. The vapor stream separates from the liquid within the riser and flows out of the riser upward through the column.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: October 26, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Mark Sheldon Ross, Berne K. Stober, John Scott Buchanan
  • Patent number: 5973193
    Abstract: A method of producing ethyl acetate by reacting acetic acid with ethylene in the presence of a solid acidic catalyst comprising a zeolite selected from the group consisting of MCM-22, MCM-49, MCM-56, ZSM-5 and zeolite-Beta.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: October 26, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Robert A. Crane, Stephen H. Brown, Lorenzo De Caul
  • Patent number: 5958359
    Abstract: This invention is directed to an improved process for conversion of H.sub.2 S to sulfur, using MOST(Mobil Offgas Sulfur Treatment) catalyst or sorbent. The sorbent is typically a magnesium-aluminate spinel, with oxidation promoters such as ceria and vanadia. H.sub.2 S from the feed gas is used to regenerate sulfated sorbent, simultaneously producing elemental sulfur which is then condensed out. The improvement involves recycling a portion of the effluent from a downstream burner to mix with the feed to the sorbent. Thus some of the stoichiometric oxygen required for conversion of H.sub.2 S to S is supplied in the form of SO.sub.2 by this pre-combustion step, instead of coming totally from the oxidized/sulfated solid sorbent. This can decrease the amount of sorbent required, as well as the frequency of regenerations, thus reducing process cost. The hot recycle gas also helps to heat the feed stream.
    Type: Grant
    Filed: December 17, 1997
    Date of Patent: September 28, 1999
    Assignee: Mobil Oil Corporation
    Inventors: John S. Buchanan, Khushrav E. Nariman
  • Patent number: 5951848
    Abstract: This application discloses a process for catalytically dewaxing a feedstock whereby the aging of the dewaxing catalyst is minimized. A variety of feedstocks which possess moderate levels of nitrogen and sulfur may be dewaxed in this invention. The feed is treated by a catalyst system comprising two catalysts acting in synergistic combination, a hydrotreating catalyst and a dewaxing catalyst. The hydrotreating catalyst is preferably loaded with noble metals and is capable of operating at higher than usual space velocities. The dewaxing catalyst is downstream of the hydrotreating catalyst. The dewaxing catalyst further comprises a constrained intermediate pore crystalline material which is loaded with a noble metal.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: September 14, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Charles L. Baker, Jr., Richard C. Dougherty
  • Patent number: 5935413
    Abstract: An apparatus for mixing vapor and liquid reactants within a column. The apparatus forms a first mixing zone into which a first reactant (e.g., vapor) is homogenized by swirl flow and flows vertically downward. The apparatus further forms a second mixing zone into which a second reactant (e.g., liquid) is homogenized by swirl flow and flows vertically downward. Additional amounts of either the first reactant, the second reactant or both may be added into or ahead of the first mixing zone or the second mixing zone as appropriate. The first reactant is directed radially to collide in crossflow with a thin sheet of the second reactant to provide intense mixing of the first and second reactants. Due to separate mixing zones for the two reactants, the mixing conditions for each can be tailored to best mix each reactant while minimizing pressure drop and minimizing the space and volume requirements for this mixing.
    Type: Grant
    Filed: December 3, 1997
    Date of Patent: August 10, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Sherri L. Boyd, Gregory P. Muldowney
  • Patent number: 5906729
    Abstract: This invention is directed to an improved process scheme to process sour feed in the reaction section of the process unit, including isomerization dewaxing with zeolite beta. The instant invention employs countercurrent flow in the fixed bed of the MIDW(Mobil Isomerization Dewaxing) reactor (the reactor in which isomerization dewaxing occurs) with recycle gas being the gas stream in the MIDW bed. With this arrangement hydrodesulfurization(HDS) and MIDW occur in an integrated process.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: May 25, 1999
    Assignee: Mobil Oil Corporation
    Inventor: Tai-Sheng Chou
  • Patent number: 5902767
    Abstract: This invention is directed to a catalyst that comprises (i) an acidic solid oxide component comprising an oxide of a Group IVB metal modified with an anion or oxyanion of a Group VIB metal, and (ii) a Group IB metal or metal oxide component. This catalyst may be used, for example, to isomerize paraffins.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: May 11, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Charles Theodore Kresge, Clarence D. Chang, Jose Guadalupe Santiesteban, David S. Shihabi, Scott Andrew Stevenson, James C. Vartuli