Patents by Inventor David A. Pappal
David A. Pappal 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).
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Patent number: 8303804Abstract: This invention relates to a process for improving the yield and properties of jet fuel from a kerosene feed. More particularly, a kerosene feedstock is hydrotreated and dewaxed using a ZSM-48 catalyst to produce a jet fuel in improved yield and having improved properties.Type: GrantFiled: October 6, 2008Date of Patent: November 6, 2012Assignee: ExxonMobil Research and Engineering CompanyInventors: Terry E. Helton, William J. Tracy, III, Michael T. Grove, Dennis H. Hoskin, Philip J. Angevine, David A. Pappal
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Publication number: 20100084313Abstract: This invention relates to a process for improving the yield and properties of jet fuel from a kerosene feed. More particularly, a kerosene feedstock is hydrotreated and dewaxed using a ZSM-48 catalyst to produce a jet fuel in improved yield and having improved properties.Type: ApplicationFiled: October 6, 2008Publication date: April 8, 2010Inventors: Terry E. Helton, William J. Tracy, III, Michael T. Grove, Dennis H. Hoskin, Philip J. Angevine, David A. Pappal
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Patent number: 7261805Abstract: A process for upgrading a hydrocarbon feedstock containing waxy components and having an end boiling point exceeding 650° F., which includes contacting the feedstock at superatmospheric hydrogen partial pressure with an isomerization dewaxing catalyst that includes ZSM-48 and contacting the feedstock with a hydrocracking catalyst to produce an upgraded product with a reduced wax content. Each catalyst is present in an amount sufficient to reduce the cloud point and the pour point of the feedstock at a conversion of greater than about 10%, and an overall distillate yield of greater than about 10% results from the process.Type: GrantFiled: May 2, 2003Date of Patent: August 28, 2007Assignee: ExxonMobil Research and Engineering CompanyInventors: Michael T. Grove, Randall D. Partridge, Terry E. Helton, David A. Pappal, Philip J. Angevine, Dominick N. Mazzone
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Patent number: 6709571Abstract: This invention is directed to an extinction recycle naphtha hydrocracking processes. Large pore zeolite catalysts with Constraint Indices less than 2, such as USY or beta, which are loaded with noble metals such as Pt or Pd or with transition metals such as Ni in combination with Mo or W are employed. Preferably, low hydrogen partial pressures, and a feedstock relatively rich in hydrogen and low in aromatics content, are used, in order to extend catalyst cycle length.Type: GrantFiled: July 20, 1999Date of Patent: March 23, 2004Assignee: Mobil Oil CorporationInventors: Kenneth J. Del Rossi, David A. Pappal, Brenda H. Rose
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Patent number: 6676829Abstract: A method is provided for removing sulfur from an effluent produced by hydrotreating a hydrocarbon feed, said effluent having a heavy fraction containing polyaromatic sulfur compounds and a lighter fraction, said method comprising contacting the effluent with a noble metal containing hydrodearomatization catalyst on a support under super-atmospheric hydrogen pressure and reaction conditions sufficient to hydrogenate at least one ring of said polyaromatic sulfur compounds and thereby produce a product with a reduced sulfur content.Type: GrantFiled: December 8, 1999Date of Patent: January 13, 2004Assignee: Mobil Oil CorporationInventors: Philip J. Angevine, Anna B. Gorshteyn, Larry A. Green, Yuk Mui Louie, David A. Pappal, Peter J. Owens, Richard J. Quann, Jolie A. Rhinehart
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Publication number: 20040004020Abstract: A process for upgrading a hydrocarbon feedstock containing waxy components and having an end boiling point exceeding 650° F., which includes contacting the feedstock at superatmospheric hydrogen partial pressure with an isomerization dewaxing catalyst that includes ZSM-48 and contacting the feedstock with a hydrocracking catalyst to produce an upgraded product with a reduced wax content. Each catalyst is present in an amount sufficient to reduce the cloud point and the pour point of the feedstock at a conversion of greater than about 10%, and an overall distillate yield of greater than about 10% results from the process.Type: ApplicationFiled: May 2, 2003Publication date: January 8, 2004Inventors: Michael T. Grove, Randall D. Partridge, Terry E. Helton, David A. Pappal, Philip J. Angevine, Dominick N. Mazzone
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Publication number: 20020112989Abstract: A hydrocarbon hydrogenation process and a catalytic composition having hydrogenation functionality. The catalytic composition includes at least two noble metals supported on an inorganic, porous crystalline phase support material having pores with diameters of at least about 13 Angstrom Units and exhibiting, after calcination, an X-ray diffraction pattern with at least one peak at a d-spacing greater than about 18 Å with a relative intensity of 100, and having a benzene sorption capacity greater than about 15 grams benzene per 100 grams of the support material at 50 torr and 25° C. The noble metals are selected from the group consisting of Pd, Pt, Rh and lr and the crystalline material is a metallosilicate or an aluminosilicate.Type: ApplicationFiled: August 16, 2001Publication date: August 22, 2002Inventors: Stuart S. Shih, Yuk-Mui Louie, David A. Pappal, Jean W. Beeckman
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Patent number: 6261441Abstract: This invention relates to the refining of petroleum products, and more particularly to an integrated hydroprocessing scheme involving a hydrocracking stage and subsequent dewaxing stage. Materials boiling in the middle distillate or lube oil range may be dewaxed. The bottoms streams (and optionally, other streams) of each stage are maintained separately from one another, during processing. Dewaxing may occur using either hydroisomerization catalysts or shape-selective catalysts or both in series. One embodiment employs a baffle in the flash zone of a fractionator to separate bottoms streams from each other. Alternatively, the effluent from the hydrocracking stage may be processed separately from the effluent from the dewaxing stage. The bottoms fraction from the dewaxing stage may be recycled back to the hydrocracking stage for further processing or used as lube base stock.Type: GrantFiled: September 24, 1998Date of Patent: July 17, 2001Assignee: Mobil Oil CorporationInventors: Arthur R. Gentry, Kenneth W. Goebel, Timothy L. Hilbert, Michael G. Hunter, David A. Pappal, Randall D. Partridge
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Patent number: 5512260Abstract: A process for reducing sulfur content in a gaseous stream with the production of elemental sulfur by first treating the gaseous steam with hydrogenation and hydrolysis to convert substantially all of the sulfur components therein to hydrogen sulfide. Then reducing the water content of the gaseous stream to optimize chemical equilibrium. Thereafter, the gaseous steam is contacted in an oxidation reactor with an acid catalyst at a temperature of about 150.degree. C. to about 350.degree. C. to convert hydrogen sulfide to elemental sulfur. The product gas leaving the oxidation reactor is cooled to separate elemental sulfur by condensation. The acid catalyst is a shape selective zeolite, a metal-exchanged or impregnated alumina, or a mixture thereof. The alumina is gamma phase alumina impregnated with from about 0.2 wt % to about 2.0 wt % metal.Type: GrantFiled: March 4, 1994Date of Patent: April 30, 1996Assignee: Mobil Oil CorporationInventors: Thomas R. Kiliany, John P. McWilliams, David A. Pappal
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Patent number: 5393717Abstract: There is provided a process for regenerating a coked catalyst comprising a zeolite and a noble metal such as platinum. The process involves treating the coked catalyst under somewhat mild oxidation conditions, whereby a sufficient portion of the coke is removed from the catalyst to restore the hydrocarbon sorption properties of the zeolite component to the level observed in the non-coked form. Surprisingly, the original activity of the catalyst is substantially restored, even though a substantial amount of coke remains on the regenerated catalyst.Type: GrantFiled: May 18, 1993Date of Patent: February 28, 1995Assignee: Mobil Oil Corp.Inventors: Minas R. Apelian, Anthony S. Fung, George H. Hatzikos, Clinton R. Kennedy, Chung-Hur Lee, Thomas R. Kiliany, Poh K. Ng, David A. Pappal
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Patent number: 5320742Abstract: A sulfur-containing catalytically cracked naphtha is upgraded to form a low-sulfur gasoline product by a process which retains the octane contribution from the olefinic front end of the naphtha. Initially, the mercaptan sulfur in the front end of the cracked naphtha is converted to higher boiling disulfides by oxidation. The front end, which is then essentially an olefinic, high octane sulfur-free material, may be blended directly into the gasoline pool. The back end, which now contains the original higher boiling sulfur components such as thiophenes, together with the sulfur transferred from the front end as disulfides, is hydrotreated to produce a desulfurized product. This desulfurized product, which has undergone a loss in octane by saturation of olefins, is then treated in a second stage, by contact with a catalyst of acidic functionality, preferably a zeolite such as ZSM-5, under conditions which produce a product in the gasoline boiling range of higher octane value.Type: GrantFiled: October 19, 1992Date of Patent: June 14, 1994Assignee: Mobil Oil CorporationInventors: David L. Fletcher, Timothy L. Hilbert, David A. Pappal, David W. Rumsey, Gerald J. Teitman
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Patent number: 5062945Abstract: A method and apparatus are disclosed to reduce the amount of unstripped hydrocarbon flowing to the regenerator in an FCC unit. The catalyst stripper section is heated by indirect heat exchange with a mixture of hot regenerator flue gas and regenerated catalyst.Type: GrantFiled: October 16, 1989Date of Patent: November 5, 1991Assignee: Mobil Oil CorporationInventors: David A. Pappal, Paul H. Schipper
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Patent number: 5006495Abstract: An FCC catalyst regeneration technique in which the catalyst is regenerated in a dense bed regenerator. Regenerator effluent gases are collected from different parts of the regenerator vessel in a common collection zone and passed through the catalyst separation cyclones from the common collection zone. Removal of nitrogen oxides from the regeneration effluent gases is enhanced by passing spent cracking catalyst through the effluent gases from a secondary spent catalyst inlet in the upper part of the regeneration vessel. Coke on the spent catalyst effects a reduction of nitrogen oxide (NOx) species in the effluent gases to nitrogen.Type: GrantFiled: February 26, 1990Date of Patent: April 9, 1991Assignee: Mobil Oil CorporationInventors: David A. Pappal, Michael S. Sarli
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Patent number: 4973398Abstract: A method and apparatus are disclosed to reduce the amount of coke and unstripped hydrocarbon flowing to the regenerator in an FCC unit. The catalyst stripper section is heated by indirect heat exchange with hot regenerator flue gas.Type: GrantFiled: May 25, 1988Date of Patent: November 27, 1990Assignee: Mobil Oil Corp.Inventors: David A. Pappal, Paul H. Schipper
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Patent number: 4971681Abstract: A method and apparatus are disclosed to reduce the amount of unstripped hydrocarbon flowing to the regenerator in a riser reactor FCC unit. The catalyst stripper section is heated by indirect heat exchange with a mixture of hot regenerator flue gas and regenerated catalyst. In the preferred embodiment, the regenerator is operated under partial combustion conditions and the resulting carbon monoxide-containing flue gas is burned in a catalyst stripper heat exchanger.Type: GrantFiled: September 13, 1989Date of Patent: November 20, 1990Assignee: Mobil Oil Corp.Inventors: Mohsen N. Harandi, Hartley Owen, David A. Pappal, Paul H. Schipper
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Patent number: 4906354Abstract: The thermal stability of jet fuel sweetened by oxidation is improved by washing the sweetened fuel with strong aqueous caustic.Type: GrantFiled: September 10, 1987Date of Patent: March 6, 1990Assignee: Mobil Oil CorporationInventors: Edward G. Barry, Joseph G. Bendoraitis, Perry W. Kirklin, David A. Pappal
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Patent number: 4778665Abstract: Abatement of nitrogen oxides in an industrial exhaust gas is effected by reduction of the nitrogen oxides with ammonia in the presence of a catalyst comprising a porous crystalline siliceous solid such as a ZSM-5 type zeolite. Fast responses to changes of NO.sub.x load is achieved with a zeolite of low to moderate acid activity. The catalyst may be virgin catalyst, aged catalyst previously used for the conversion of a hydrocarbon or an organic compound, or artifically aged catalyst.Type: GrantFiled: February 6, 1987Date of Patent: October 18, 1988Assignee: Mobil Oil CorporationInventors: Sowmithri Krishnamurthy, John P. McWilliams, David A. Pappal, Catherine T. Sigal, Thomas R. Kiliany, Jr.