Patents Represented by Attorney Joseph J. Dvorak

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  • Strongly magnetic organic solid state composition of matter
    Patent number: 4803006
    Abstract: The present invention is an organic composition of matter having paramagnetic or ferromagnetic properties, wherein the composition includes a donor molecule and an acceptor molecule in a mix-stacked form and a dopant with an electron affinity so as to generate a ground state molecule with an appreciable triplet character. Also included is a method for preparing such a composition of matter.
    Type: Grant
    Filed: June 26, 1987
    Date of Patent: February 7, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Long Y. Chiang, Aaron N. Bloch
  • Process for preparing a supported, promoted molybdenum and/or tungsten sulfide hydroprocessing catalyst
    Patent number: 4801570
    Abstract: This invention relates to the preparation and use of supported, manganese sulfide promoted molybdenum and tungsten sulfide catalysts useful for hydroprocessing processes, particularly hydrotreating. These catalysts are prepared by heating a composite of support material and precursor salt under oxygen-free conditions and in the presence of sulfur, wherein said precursor salt contains a thiometallate anion of Mo, W or mixture thereof and a cation comprising one or more promoter metals which are chelated by at least one neutral, nitrogen-containing polydentate ligand, and wherein said promoter metal comprises Mn alone or a mixture of Mn with Co, Ni, Zn, Cu or mixture thereof.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: January 31, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Archie R. Young, Teh C. Ho, Allan J. Jacobson, Russell R. Chianelli
  • Transition metal sulfide promoted molybdenum or tungsten sulfide catalysts and their uses for hydroprocessing
    Patent number: 4795731
    Abstract: Hydrocarbon feeds are upgraded by contacting a feed, at elevated temperature and in the presence of hydrogen, with a self-promoted catalyst prepared by heating one or more catalyst precursors under oxygen-free conditions in the presence of sulfur at a temperature of at least about 150.degree. C. The catalyst precursors will be one or more compounds of the formula (ML) (Mo.sub.y W.sub.1-y S.sub.4) wherein M comprises one or more divalent promoter metals selected from the group consisting of Ni, Co, Zn, Cu and mixtures thereof, wherein y is any value ranging from 0 to 1 and wherein L is one or more neutral, nitrogen-containing ligands at least one of which is a chelating, polydentate ligand.
    Type: Grant
    Filed: November 19, 1987
    Date of Patent: January 3, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Theresa A. Pecoraro, Allan Jacobson, Russell R. Chianelli
  • Hydrotreating catalysts comprising supported, mixed metal sulfide of iron promoted Mo and W and their uses
    Patent number: 4792541
    Abstract: This invention relates to the preparation and use of catalysts useful for hydroprocessing processes, such as hydrotreating, wherein said catalysts are formed by heating, at elevated temperature, in the presence of sulfur and under oxygen-free conditions, a composite of support material and one or more catalyst precursor salts containing a thiometallate anion of Mo, W or mixture thereof and a cation comprising one or more divalent promoter metals at least one of which is iron, wherein said promoter metal or metals are chelated by at least one neutral, nitrogen-containing polydentate ligand, and wherein said additional divalent promoter metal, if any, is selected from the group consisting of Ni, Co, Mn, Zn, Cu and mixture thereof.
    Type: Grant
    Filed: August 21, 1986
    Date of Patent: December 20, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Teh C. Ho, Archie R. Young, Allan J. Jacobson, Russell R. Chianelli
  • Method and fuel composition for reducing octane requirement increase
    Patent number: 4787916
    Abstract: It has been found that when minor amounts of quaternary ammonium hydroxides are added to gasolines, the octane requirement increase for fuel fired spark ignition internal combustion engines is decreased or reversed.Thus, in one aspect, the present invention comprises a method for controlling the ORI of spark ignition internal combustion engines by operating such engines on a fuel containing certain quaternary ammonium hydroxides in amounts sufficient to control the ORI.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: November 29, 1988
    Assignee: Exxon Research and Engineering Company
    Inventor: Nicholas Feldman
  • Catalysts comprising silica supported on alumina, their preparation and use
    Patent number: 4778779
    Abstract: Useful cracking catalysts and catalyst supports comprising silica supported on alumina are prepared by compositing particles of silica or silica precursor with particles of porous alumina and subjecting the resulting composite to high temperature steaming in a non-reducing environment at a temperature of at least about 500.degree. C. for a time sufficient to disperse at least a portion of the silica over the alumina surface. The silica wets, spreads out and reactions with the surface hydroxyul groups of the alumina. The supported silica on alumina composites that can be made from this process may exhibit properties of both bulk silica and bulk alumina at the same time, bulk silica and alumina whose exterior surface only has been modified with silica as wells as composites exhibiting surface properties different from both bulk silica and bulk alumina.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: October 18, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Lawrence L. Murrell, Nicholas C. Dispenziere, Jr., David E. Vaughan
  • Baffle seal for sheel and tube heat exchangers
    Patent number: 4778005
    Abstract: This invention relates to shell and tube heat exchangers and similar equipment and is particularly concerned with an improved arrangement for sealing the longitudinal edges of the pass baffle with the inner wall of the shell in such a manner as to prevent fluid leaks through that juncture which have the effect of bypassing the heat exchanger. The invention also relates to an improved tube bundle design wherein an aligned notch or indentation is provided in each of the tube bundle cross baffles adjacent the longitudinal edges of the pass baffle to yield a measure of protection for the edge of the pass baffle when the bundle is removed from the shell for maintenance purposes and to an optimized tube bundle configuration which may be readily reversed or rotated to extend its service life.
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: October 18, 1988
    Assignee: Exxon Research and Engineering Company
    Inventor: Hosea E. Smith
  • Metal halogen electrochemical cell
    Patent number: 4766045
    Abstract: It has now been discovered that reduction in the coulombic efficiency of metal halogen cells can be minimized if the microporous separator employed in such cells is selected from one which is preferably wet by the aqueous electrolyte and is not wet substantially by the cathodic halogen.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: August 23, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Richard J. Bellows, Edward Kantner
  • Sodium addition to low rank coal to enhance particulate removal from combustion effluent
    Patent number: 4765259
    Abstract: The present invention provides a method for rendering coal more suitable for combustion in systems having electrostatic precipitators for removal of particulates from effluent combustion gas streams, which comprises contacting the coal with an aqueous solution of a sodium compound for a time sufficient to permit the sodium in said solution to react with the coal.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: August 23, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Thomas H. Colle, Ashok K. Moza
  • pH control of a process stream
    Patent number: 4762796
    Abstract: The invention features a unique pH control system and method for maintaining the proper pH in a continuous process stream. The system backmixes a sample stream, which decreases the dynamic gain of the control system, and which allows for the ease of adding a controlled amount of reagent or buffer to the process stream on a continuous basis.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: August 9, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Richard Weber, Loren H. Haag
  • Supported transition metal sulfide promoted molybdenum or tungsten sulfide catalysts and their uses for hydroprocessing
    Patent number: 4755496
    Abstract: Hydrocarbon feeds are upgraded by contacting a feed, at elevated temperature and in the presence of hydrogen, with a supported self-promoted catalyst prepared by heating a composite of support material and one or more catalyst precursor salts under oxygen-free conditions and in the presence of sulfur at a temperature of at least about 250.degree. C. The precursor salt or salts will be of the general formula (ML) (Mo.sub.y W.sub.1-y S.sub.4) wherein M comprisess one or more promoter metals selected from the group consisting essentially of Mn, Fe, Co, Ni, Zn and mixtures thereof, wherein y is any value ranging from 0 to 1 and wherein L is one or more neutral, nitrogen-containing ligands at least one of which is a chelating, polydentate ligand.
    Type: Grant
    Filed: April 30, 1987
    Date of Patent: July 5, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Teh C. Ho, Russell R. Chianelli, Allan J. Jacobson, Archie R. Young
  • Grease composition
    Patent number: 4749502
    Abstract: The present invention is directed at a grease composition comprising:A. an oil component having a major amount of a synthetic fluid having a viscosity of at least 50 cSt at 40.degree. C. and a minor amount of a mineral oil having a pour point below -20.degree. C.; andB. a thickener.The oil component of the grease composition preferably comprises between about 30 and 90 wt. % synthetic oil, more preferably between about 40 and about 80 wt. % synthetic oil and from 70 to 10 wt. % and preferably 60 to 20 wt. % mineral oil. The viscosity of the synthetic oil preferably is at least 50 cSt, more preferably at least 100 cSt at 40.degree. C. The synthetic oil preferably is selected from polyolefins, esters, polyesters, high VI isoparaffins, and mixtures thereof, with polyalphaolefins being particularly preferred. The polyalphaolefins preferably comprise C.sub.8 and C.sub.12 monoalphaolefin building blocks.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: June 7, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: A. Gordon Alexander, Donald W. Murray
  • Hydrotreating catalysts comprising supported mixtures of a sulfide of trivalent chromium and molybdenum or tungsten
    Patent number: 4749673
    Abstract: Supported hydroprocessing catalysts comprising a sulfide of trivalent chromium and Mo, W or mixture thereof are obtained by compositing a preselected quantity of support material with a precursor comprising a mixture of (i) a hydrated oxide of trivalent chromium and (ii) a salt containing a thiometallate anion of Mo or W and a cation comprising the conjugate acid of at least one neutral, nitrogen-containing polydentate ligand and heating the composite in the presence of sulfur and hydrogen in an oxygen-free atmosphere. These compositions have been found to be useful hydrotreating catalysts having nitrogen removal activity superior to that of commercial catalysts derived from cobalt molybdate on alumina.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: June 7, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Archie R. Young, Teh C. Ho, Allan J. Jacobson, Russell R. Chianelli
  • Supported chromium-molybdenum and tungsten sulfide catalysts
    Patent number: 4748142
    Abstract: Supported hydroprocessing catalysts comprising a sulfide of trivalent chromium and molybdenum or tungsten which optionally may contain one or more promoter metals such as Co, Fe, Ni and mixture thereof. These catalysts are obtained by compositing a preselected quantity of support material with a precursor salt containing a tetrathiometallate anion of Mo or W and a cation comprising trivalent chromium and, optionally, one or more promoter metals wherein both said trivalent chromium and promoter metal are chelated by at least one neutral, nitrogen-containing polydentate ligand and heating the composite in the presence of sulfur and hydrogen in an oxygen-free atmosphere. These catalysts have high selectivity for nitrogen removal. The chromium and promoter metal do not have to be in the same cation.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: May 31, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Russell R. Chianelli, Teh C. Ho, Allan J. Jacobson, Archie R. Young
  • Extractor apparatus
    Patent number: 4748006
    Abstract: The present invention is predicated on the discovery that emulsion prone zones generally occur in extractors at the end or region where feed is introduced and spent solvent is withdrawn. The build-up of feed droplets in this zone occurs because of slow coalescence rate, higher liquid loadings, lower interfacial tension, smaller density difference, and the like, in this zone. Accordingly, the present invention, in its simplest sense comprises a vertical extractor column having a settling zone located at one end of a mixing zone and having coalescence media located in the settling zone. Importantly, the coalescence media is positioned so as to promote the drainage of coalesced droplets to the side of the extractor where they drain back into the mixing zone. Preferably weir means are located in the settling zone between the coalescence media and the mixing zone for collecting coalesced droplets.
    Type: Grant
    Filed: January 6, 1986
    Date of Patent: May 31, 1988
    Assignee: Exxon Research and Engineering Company
    Inventor: Robert J. Fiocco
  • Flue gas shut-off valve
    Patent number: 4730808
    Abstract: The slide valve of the present invention is adapted for use in horizontal piping runs. It comprises a valve body, an orifice plate, a sliding plate and guide means for the sliding plate. The orifice plate is located in the valve body and inclined at an angle, .alpha., selected to achieve a predetermined seating force when the sliding plate, also inclined, is in the valve body in the closed position and bearing on the orifice plate. The guide means are provided for guiding the slide plate when it is moved in and out of the valve body under conditions of use.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: March 15, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Donald F. Shaw, Arthur A. Lietz
  • Heterometallic thiocubanes (C-2044)
    Patent number: 4730064
    Abstract: This invention relates to heterometallic thiocubane compositions containing the M.sub.2.sup.1 M.sub.2.sup.2 S.sub.4 cluster core and methods of making them wherein M.sup.1 is Re, V, Mo or W and M.sup.2 is Co, Cr, Cu, Ni or Fe but preferably Co. More particularly, the invention relates to compositions of the formula M.sub.2.sup.2 M.sub.2.sup.2 S.sub.4 L.sub.2.sup.1 L.sub.2.sup.2 L.sub.2.sup.3 wherein M.sup.1 and M.sup.2 are as above, L.sup.1 is a bidentate sulfur or nitrogen bearing ligand (most preferably a dialkyldithiocarbamate), L.sup.2 is optional but may be an O, N, P or S-containing monodentate donor ligand, and L.sup.3 may be CO, a monodentate anion ligand such as a halide (preferably C1), mercaptide or alkoxide, or another O, N, P, or S containing monodentate donor ligand. The compositions are suitable for making active hydrotreating catalysts.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: March 8, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Thomas R. Halbert, Steven A. Cohen, Edward I. Stiefel
  • Low stress cyclone gas collection systems
    Patent number: 4728348
    Abstract: The present invention comprises suspending vessel internal components such as cyclones from a vessel roof by support hangers having a predetermined length and thermal coefficient of expansion such that the thermal expansion of support hangers of different lengths is such that the elevation of suspended components relative to each other under variable thermal conditions is substantially constant.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: March 1, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Norman W. Nelson, Wilbur H. Hild, Jr., Donald F. Shaw
  • Synthesis of polyquinoline by the catalytical dehydrogenative polymerization of tetrahydroquinoline
    Patent number: 4727135
    Abstract: A new method for the preparation of polyquinoline is discovered. Upon the treatment of tetrahydroquinoline (THQ) with ReS.sub.2+x at the refluxing temperature of THQ, a nearly quantitative yield of polyquinoline is obtained and characterized.
    Type: Grant
    Filed: July 17, 1986
    Date of Patent: February 23, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Long Y. Chiang, Russell R. Chianelli
  • Hydrotreating catalysts comprising a mixture of a sulfide of a promoter metal amorphous sulfide of trivalent chromium and microcrystalline molybdenum or tungsten sulfide
    Patent number: 4721558
    Abstract: A composition of matter comprising a mixture of (i) a sulfide of at least one promoter metal selected from the group consisting of Ni, Co, Mn, Cu, Zn and mixture thereof and mixtures thereof with Fe, (ii) an amorphous sulfide of trivalent chromium and (iii) microcrystalline of metal sulfide of a metal selected from the group consisting of molybdenum, tungsten and mixture thereof. These compositions have been found to be useful hydrotreating catalysts having nitrogen removal activity superior to that of commercial catalysts such as cobalt-molybdate on alumina.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: January 26, 1988
    Assignee: Exxon Research and Engineering Company
    Inventors: Allan J. Jacobson, Teh C. Ho, Russell R. Chianelli, John J. Steger, Angelo A. Montagna