Patents Represented by Attorney Penny L. Prater
  • Patent number: 5885438
    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, wherein the catalyst is prepared in the absence of boron. The alpha value of the catalyst is no greater than 20. The catalyst comprises a noble metal hydroisomerization catalyst such as Pt. The feed may be hydrocracked prior to dewaxing with the large pore zeolite. The effluent of the process 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: March 23, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Minas R. Apelian, William S. Borghard, Thomas F. Degnan, Jr., Robert T. Hanlon, Mae K. Rubin
  • Patent number: 5865986
    Abstract: This is a process for upgrading a petroleum naphtha fraction. The naphtha is subjected to reforming and the reformate is cascaded to a benzene and toluene synthesis zone over a benzene and toluene synthesis catalyst comprising a molecular sieve of low acid activity. The preferred molecular sieve is steamed ZSM-5. The benzene and toluene synthesis zone is operated under conditions compatible with the conditions of the reformer such as pressures of above about 50 psig (446 kPa) and temperatures above about 800.degree. F. (427.degree. C). In one aspect of the invention, the benzene and toluene synthesis catalyst includes a metal hydrogenation component such as cobalt, nickel, platinum or palladium. In one mode of operation, the benzene and toluene synthesis catalyst replaces at least a portion of the catalyst of the reformer. The process produces a product containing an increased proportion of benzene and toluene, and a reduced proportion of C8 aromatics, particularly ethylbenzenes, as compared to the reformate.
    Type: Grant
    Filed: November 3, 1995
    Date of Patent: February 2, 1999
    Assignee: Mobil Oil Corporation
    Inventors: John Scott Buchanan, Jane C. Cheng, David G. Freyman, Werner Otto Haag, Mohsen N. Harandi, Dominick N. Mazzone, Roger A. Morrison, Norman J. Rouleau, Charles M. Sorensen, Hye Kyung C. Timken, Robert Adams Ware
  • Patent number: 5865987
    Abstract: Low sulfur gasoline is produced from an olefinic, cracked, sulfur-containing naphtha by treatment over an acidic catalyst, preferably an intermediate pore size zeolite such as ZSM-5 to crack low octane paraffins and olefins under mild conditions with limited aromatization of olefins and naphthenes. A benzene-rich co-feed is co-processed with the naphtha to reduce the benzene levels in the co-feed by alkylation. This initial processing step is followed by hydrodesulfurization over a hydrotreating catalyst such as CoMo on alumina. In addition to reducing benzene levels in the combined feeds, the initial treatment over the acidic catalyst removes the olefins which would otherwise be saturated in the hydrodesulfurization, consuming hydrogen and lowering product octane, and converts them to compounds which make a positive contribution to octane. Overall liquid yield is high, typically at least 90 percent or higher.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: February 2, 1999
    Inventors: William S. Borghard, Nick A. Collins, Paul P. Durand, Timothy L. Hilbert, Jeffrey C. Trewella
  • Patent number: 5865988
    Abstract: Low sulfur gasoline is produced from an olefinic, cracked, sulfur-containing naphtha by treatment over an acidic catalyst, preferably an intermediate pore size zeolite such as ZSM-5 to crack low octane paraffins and olefins under relatively mild conditions, with limited aromatization of olefins and naphthenes. This is followed by hydrodesulfurization over a hydrotreating catalyst such as CoMo on alumina. The initial treatment over the acidic catalyst removes the olefins which would otherwise be saturated in the hydrodesulfurization, consuming hydrogen and lowering product octane, and converts them to compounds which make a positive contribution to octane. Overall liquid yield is high, typically at least 90 percent of higher. Product aromatics are typically increased by no more than 25 weight percent relative to the feed and may be lower than the feed.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: February 2, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Nick A. Collins, Paul P. Durand, Timothy L. Hilbert, Gerald J. Teitman, Jeffrey C. Trewella
  • Patent number: 5854170
    Abstract: There is provided a method for preparing an acidic solid comprising a Group IVB metal oxide modified with an oxyanion of a Group VIB metal. An example of this acidic solid is zirconia, modified with tungstate. This modified solid oxide may be used as a catalyst, for example, to isomerize C.sub.4 to C.sub.8 paraffins. The modified solid oxide is treated with hydrogen at elevated temperatures to enhance catalytic properties of the material.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: December 29, 1998
    Assignee: Mobil Oil Corporation
    Inventors: Clarence D. Chang, Frank T. DiGuiseppi, Scott Han, Jose G. Santiesteban, David L. Stern
  • Patent number: 5763370
    Abstract: Pre-blended combinations and reaction products of at least one metallic dithiocarbamate and at least one metallic dithiophosphate provide the synergism of antiwear properties with friction-reducing properties for lubricants and greases.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: June 9, 1998
    Assignee: Mobil Oil Corporation
    Inventors: John Phillips Doner, Liehpao Oscar Farng
  • Patent number: 5741469
    Abstract: A dry, regenerable solid oxide process directed to convert SO.sub.x from the flue gas stream from a power plant, a coal or oil-fired plant or process heat furnace, or an FCC regenerator to elemental sulfur without using a Claus unit, a hydrogen plant, a regeneration gas separation system, or a hydrogenation section. This dry, regenerable solid oxide process is also effective on Claus plant tail-gas. This process uses solid oxides, such as, for example, magnesium aluminates or spinels to remove sulfur oxides from flue gas streams. The solid oxide is then regenerated by a reducing gas to release the sulfur compounds contained on the solid oxide to produce a gas stream comprising hydrogen sulfide, sulfur oxides and elemental sulfur. The elemental sulfur is then condensed and recovered as a product and the resulting gas stream may be recycled to be reprocessed over the solid oxide.
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: April 21, 1998
    Assignee: Mobil Oil Corporation
    Inventors: Nazeer A. Bhore, David L. Johnson, Khushrav E. Nariman, David L. Stern
  • Patent number: 5728358
    Abstract: There is provided a process directed to the use of gases containing or mixed with carbon monoxide, such as synthesis gas, to aid in the regeneration of sulfur oxide-sorbed solid oxides, such as magnesium aluminates or spinels. This process is especially useful in applications where the solid oxide is used to purify the flue gas stream from an FCC regenerator, coal or oil-fired plant, power plant or process heat furnace, or the tail gas from a Claus plant. The process is also useful to remove sulfur oxides from flue gases produced in solid fuel combusters. According to this invention, carbon monoxide may be used alone or in combination with other gases to make the regeneration of the solid oxide exothermic or less endothermic, thereby improving the effectiveness of the regeneration.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: March 17, 1998
    Assignee: Mobil Oil Corporation
    Inventors: Amos A. Avidan, Nazeer A. Bhore, J. Scott Buchanan, David L. Johnson, Khushrav E. Nariman, David L. Stern
  • Patent number: 5725755
    Abstract: A catalytic hydrodewaxing process is described for producing liquid hydrocarbon lubricant base stock from liquid hydrocarbon feedstock in greater yield and viscosity index equivalent to solvent dewaxing methods. The process involves contacting a feedstream comprising hydrogen and the hydrocarbon feedstock with shape selective metallosilicate catalyst particles under hydrodewaxing conditions sufficient to produce a base stock having a predetermined viscosity index without regard to the base stock pour point temperature produced by the process. Pour point depressants are added to the base stock to lower the pour point temperature of the base stock to a predetermined temperature.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: March 10, 1998
    Assignee: Mobil Oil Corporation
    Inventor: T. Reginald Forbus
  • Patent number: 5643440
    Abstract: Petroleum wax feeds having a low oil content are converted to high viscosity index lubricants by a two-step hydrocracking-hydroisomerization process in which the wax feed is initially subjected to hydrocracking under mild conditions with a conversion to lube range products of between generally 30 and 40 weight percent of the feed. The hydrocracking is carried out at a hydrogen pressure of at least 800 psig using an amorphous catalyst which preferentially removes the aromatic components present in the initial feed. The hydrocracked effluent is then subjected to hydroisomerization in a second step using a low acidity zeolite beta catalyst. The second stage may be operated at high pressure by cascading the first stage product into the second stage or at a lower pressure, typically from 200 to 1000 psig. The second stage catalyst is preferably a noble metal containing zeolite beta catalyst. The second stage is carried out at relatively low temperature, typically from 600.degree. to 650.degree. F.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: July 1, 1997
    Assignee: Mobil Oil Corporation
    Inventors: William S. Borghard, Thomas F. Degnan, Dominick N. Mazzone
  • Patent number: 5611912
    Abstract: A process for the production of diesel fuel with a high cetane number at a low cloud point, which involves hydrocracking highly aromatic fractions obtained from catalytic cracking operations. The fraction of hydrocracker effluent which boils between about 400.degree. F. (205.degree. C.) and 1000.degree. F. (538.degree. C.) is subsequently catalytically dewaxed in order to obtain a cloud point of no more than 41.degree. F. (5.degree. C.). The hydrocracker effluent fraction is preferably recycled to the hydrocracking step prior to dewaxing.
    Type: Grant
    Filed: January 5, 1996
    Date of Patent: March 18, 1997
    Assignee: Mobil Oil Corporation
    Inventors: Scott Han, Roland H. Heck, Michael E. Ehlers
  • Patent number: 5573657
    Abstract: A hydrogenation process for reducing the unsaturation of lubricants uses a catalyst which is based on an ultra-large pore crystalline material. The crystalline material has pores of at least 13 .ANG. diameter arranged in a uniform manner and exhibits unusually large sorption capacity demonstrated by its benzene adsorption capacity of greater than about 15 grams benzene/100 grams (50 torr and 25.degree. C.). A preferred form of the catalyst has a hexagonal structure which exhibits a hexagonal electron diffraction pattern that can be indexed with a d.sub.100 value greater than about 18 .ANG.. The hydrogenation catalysts based on these materials are capable of reducing the unsaturation in poly alpha olefin lubricants to a low level.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: November 12, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Thomas F. Degnan, Richard C. Dougherty, George H. Hatzikos, Stuart S. Shih, Tsoung Y. Yan
  • Patent number: 5569407
    Abstract: Polyalkylene amine coupled carboxylates are effective multifunctional additives, providing cleanliness to fuels and lubricants as well as friction-reducing and corrosion-inhibiting properties.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: October 29, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Noyes L. Avery, Joan C. Axelrod, James T. Carey, John Hiebert, Andrew G. Horodysky
  • Patent number: 5552069
    Abstract: Polyalkylene amine coupled heterocyclic compounds are effective multifunctional additives, providing cleanliness to fuels and lubricants as well as anti-wear, friction-modifying, thermal and oxidative stabilizing properties. The beneficial effects of the product of the instant invention apparently result from an internal synergism between the polyalkylene amine groups and the heterocyclic groups.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: September 3, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Noyes L. Avery, Joan C. Axelrod, James T. Carey, John Hiebert, Andrew G. Horodysky
  • Patent number: 5538520
    Abstract: Polyalkylene amine coupled heterocyclic compounds are effective multifunctional additives, providing cleanliness to fuels and lubricants as well as anti-wear, friction-modifying, thermal and oxidative stabilizing properties. The beneficial effects of the product of the instant invention apparently result from an internal synergism between the polyalkylene amine groups and the heterocyclic groups.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: July 23, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Noyes L. Avery, Joan C. Axelrod, James T. Carey, John Hiebert, Andrew G. Horodysky
  • Patent number: 5536391
    Abstract: This invention discloses an enhanced process for the hydroprocessing of a feed, the feed comprising a highly aromatic refinery distillate stream boiling in the range between 300.degree. and 900.degree. F. The feed is separated into light and heavy streams such that the light stream contains from 0.1 to 5 wt. % dibenzothiophene, substituted dibenzothiophenes, and heavier polycyclic thiophenes. The lighter stream is hydrotreated at pressures from 300.degree. to 1000.degree. F. with a commercial catalyst having a hydrogenation component. The heavier stream is treated in the presence of hydrogen at higher pressure, from 600 to 2000 psig with a catalyst comprising active material having a Constraint Index of less than 2 in addition to a hydrogenation component in order to achieve over 35% conversion of material boiling above 630.degree. F. The active material of the catalyst is a highly siliceous zeolite or an acidic amorphous silica-alumina material.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: July 16, 1996
    Inventors: Paul A. Howley, Gregory A. Jablonski, L. Deane Rollmann, Hye K. C. Timken
  • Patent number: 5520799
    Abstract: This invention is a process for the upgrading of distillate feeds. A batch of supported hydroprocessing catalyst is placed in a reaction zone, which is usually a fixed bed reactor. The hydroprocessing catalyst comprises an effective amount of a noble metal or metals and has a specific activity. Both low aromatic diesel and jet fuel may be produced in separate blocks over the same catalyst batch, using different feeds and often different conditions. The activity of the catalyst is restored each time the feed is switched. When production is switched from jet fuel to low aromatics diesel, activity may be regained more quickly by holding the catalyst at a higher temperature than the reaction temperature for a specific period of time prior to dropping the temperature to the reaction temperature. Switching from one feed to the other may continue for about one year before the catalyst batch is changed. A dual catalyst system may alternatively be employed.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: May 28, 1996
    Assignee: Mobil Oil Corporation
    Inventors: Stephen H. Brown, Paul P. Durand, Timothy L. Hilbert, Thomas R. Kiliany, Chang-Kuei Lee, Jeffrey C. Trewella
  • Patent number: 5466361
    Abstract: Aqueous sulfur and caustic component-containing waste streams are disposed of in an environmentally acceptable manner employing a process featuring integrated coking and gasification operations.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: November 14, 1995
    Assignee: Mobil Oil Corporation
    Inventors: Roland H. Heck, Heinz Heinemann, P. T. Reischman, Paul B. Venuto, D. Duayne Whitehurst
  • Patent number: 5380442
    Abstract: Waste materials are removed from Stretford solution in the form of sulfates by catalytic oxidation. The Stretford solution, which was used to treat sulfur contaminated gas streams is first regenerated by oxidation to restore the vanadium present to a pentavalent form. It is then passed to a reaction zone where it is contacted with a catalyst and an oxygen source. The catalyst comprises a porous solid substrate on which a metal or metal compound insoluble in Stretford solution is deposited. Waste materials, primarily thiosulfates, are thus oxidized to sulfates. The effluent of the reaction zone is then passed to a crystallizer, where the sulfates are precipitated out as crystals of Glauber's salt. The Glauber's salt is recovered as a product and the Stretford solution is recycled to a scrubber for the treatment of gas streams.
    Type: Grant
    Filed: November 18, 1993
    Date of Patent: January 10, 1995
    Assignee: Mobil Oil Corporation
    Inventor: Tsoung Y. Yan
  • Patent number: 5340657
    Abstract: This invention relates to pillared micas, which comprise an active metal selected from the group consisting of Pt, Cr, Pd, It, Rh and mixtures thereof, and a first modifier metal selected from the group consisting of Sn, Ga and mixtures thereof. The mica may also be modified with a second modifier metal selected from the group consisting of alkali metals, alkaline earth metals, or rare earth metals and mixtures thereof. This invention further relates to a process for preparing such a catalyst.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: August 23, 1994
    Assignee: Exxon Research and Engineering Company
    Inventors: Michael C. Kerby, Kenneth L. Riley, Fred M. Long, Jack W. Johnson, John F. Brody