Patents Represented by Attorney Frank J. Sroka

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  • Hydrotreating process using carbides and nitrides of group VIB metals
    Patent number: 5200060
    Abstract: In a hydrotreating process, a hydrocarbon feedstock having a boiling of at least about 460.degree. F. is contacted with a catalyst having at least one member selected from the group consisting of a carbide of a Group VIB metal and a nitride of a Group VIB metal under hydrotreating conditions.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: April 6, 1993
    Assignee: Amoco Corporation
    Inventors: Daniel J. Sajkowski, Shigeo T. Oyama
  • Process for preparation of crude terephthalic acid suitable for reduction to prepare purified terephthalic acid
    Patent number: 5200557
    Abstract: A process is disclosed for counter-current positive displacement of an aliphatic carboxylic acid of 1 to 5 carbon atoms from a filter cake of an aromatic polycarboxylic acid containing the aliphatic carboxylic acid wherein mother liquor retained by the aromatic polycarboxylic acid has a concentration of the aliphatic carboxylic acid of 5000 ppmw, or less, based upon weight of the aromatic polycarboxylic acid present. This method is useful for the manufacture of crude terephthalic acid which is used after purification for the preparation of polyesters used for the manufacture of fabrics, fibers and plastic bottles.
    Type: Grant
    Filed: January 15, 1992
    Date of Patent: April 6, 1993
    Assignee: Amoco Corporation
    Inventors: John C. Gee, Jeffrey I. Rosenfeld, Thomas M. Bartos
  • Hydrocarbon conversion
    Patent number: 5198596
    Abstract: A contact material composition containing an intimately mixed, mixed oxide of at least one cationic species of a naturally occurring Group 111B elment, at least one cationic species of a Group IIA metal of magnesium, calcium, strontium, and barium and at least one additional metal cationic species of zirconium and hafnium, as well as methods for hydrocarbon conversion using such contact material compositions are provided.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: March 30, 1993
    Assignee: Amoco Corporation
    Inventors: Mark P. Kaminsky, Mark S. Kleefisch, George A. Huff, Jr., Don M. Washecheck, Mark K. Barr
  • Dianhydrides from catalyzed reaction of monoanhydide monoacid halides with polyalkylated mononuclear aromatics
    Patent number: 5198555
    Abstract: The invention relates to the preparation of novel dianhydrides of the formula: ##STR1## wherein R is a polyalkylated mononuclear aromatic radical, preferably a phenylene radical. The mononuclear aromatic radical may be substituted with from three to four lower alkyl radicals, preferably C.sub.1 -C.sub.4 alkyl radicals. The dianhydrides are preferably made by the reaction of a monoanhydride monoacid halide and a polyalkylated mononuclear aromatic in the presence of a Friedel-Crafts catalyst under Friedel-Crafts reaction conditions. These dianhydrides ae useful reactants in the preparation of polyimides and epoxy curing agents.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: March 30, 1993
    Assignee: Amoco Corporation
    Inventors: Vincent F. Smith, Jr., Gary J. Gudac
  • Alkylation of alkylaromatics promoted by sonicated alkali metal
    Patent number: 5198594
    Abstract: An improved process for alkylating an alkylaromatic having at least one benzylic hydrogen atom with an olefinic compound comprising contacting the alkylaromatic under liquid phase conditions with an olefinic compound in the presence of at least one alkali metal activated by sonication.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: March 30, 1993
    Assignee: Amoco Corporation
    Inventors: Lawrence D. Lillwitz, Anne M. Karachewski
  • Hydrocarbon conversion
    Patent number: 5196634
    Abstract: A contact material composition containing an intimately mixed, mixed oxide of at least one cationic species of a naturally occurring Group IIIB element, at least one cationic species of a Group IIA metal of magnesium, calcium, strontium, and barium and a cationic species of aluminum, as well as methods for hydrocarbon conversion using such contact material compositions are provided.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: March 23, 1993
    Assignee: Amoco Corporation
    Inventors: Don M. Washecheck, Mark K. Barr, George A. Huff, Jr., Mark P. Kaminsky, Mark S. Kleefisch, Victor K. Shum
  • Stabilized naphthalenedicarboxylic acid diesters
    Patent number: 5194572
    Abstract: A method of preparing polyester materials comprising polymerizing a mixture comprising a diol and a stabilized diester of a naphthalenedicarboxylic acid.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: March 16, 1993
    Assignee: Amoco Corporation
    Inventor: Allen B. Mossman
  • Composition comprising crystallizable polyamide from terephthalic acid, adipic acid, aliphatic diamine and m-xylylene diamine
    Patent number: 5194577
    Abstract: Crystallizable polyphthalamides with a useful combination of thermal and mechanical properties comprising recurring moieties of terephthalic acid, adipic acid, an aliphatic diamine of 4 to 20 carbon atoms and meta-xylylene diamine.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: March 16, 1993
    Assignee: Amoco Corporation
    Inventor: Yu-Tsai Chen
  • Apparatus and method for positioning a tool in a deviated section of a borehole
    Patent number: 5194859
    Abstract: Apparatus and method for positioning a tool, such as a surveying instrument, in the deviated section of a borehole includes a flexible rod and a positioning assembly. The flexible rod extends from the vertical section into the deviated section of the borehole with the tool being connected to the downhole end of the rod. The positioning assembly is connected to the uphole end of the rod for positioning the downhole end of the rod in the deviated section of the borehole when the positioning assembly and the uphole end of the rod are in the vertical section of the borehole. In one embodiment, the positioning assembly is a biasing assembly, such as a weight, for urging the downhole end of the rod and tool into the deviated section. In another embodiment, the positioning assembly is an orienting assembly for rotationally orienting the rod and tool in the borehole as the rod is lowered into the borehole.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: March 16, 1993
    Assignee: Amoco Corporation
    Inventor: Tommy M. Warren
  • Preparation of 1,1,1,3,3,3-hexafluoro-2,2-Di(3,4-dicarboxyphenyl)propane anhydride
    Patent number: 5194633
    Abstract: A process for preparing 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane anhydride is disclosed. 1,1,1,3,3,3-hexafluoro-2,2-di(3,4 -dimethylphenyl) propane is oxidized under liquid phase conditions in the presence of an oxygen-containing gas, bromine and heavy metal catalyst components to 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane in high yield. Addition of an anhydride of a low molecular weight carboxylic acid to the oxidation reaction mixture converts the 1,1,1-hexafluoro-2,2-di(3,4-dicarboxyphenyl)propane to 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane anhydride.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: March 16, 1993
    Assignee: Amoco Corporation
    Inventors: Walter Partenheimer, Douglas E. Fjare, Gayle G. Chany
  • Method for detecting the presence and concentration of relatively low molecular weight components in a liquid
    Patent number: 5191786
    Abstract: Disclosed is a method for determining the concentration of relatively low molecular weight target components in a liquid. The method involves commingling the liquid with a diluent to form a liquid-diluent mixture, stripping the target components from the liquid-diluent mixture, and passing the stripped target components to a detection zone wherein the concentration of each target component is determined absent the separate analysis for each component.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: March 9, 1993
    Assignee: Amoco Corporation
    Inventors: Ernest H. Baughman, John R. Winston, Kenneth W. Andresen
  • Oil shale beneficiation process using a spiral separator
    Patent number: 5192422
    Abstract: A stream containing kerogen-rich and mineral-rich oil shale particles flow in a downward helical course such that the stream is confined in a manner to give the stream an outer and upper side having a first depth and comprising a substantial amount of said kerogen-rich particles, and an inner and lower side having a second depth and comprising a substantial amount of said mineral-rich particles, the first depth being greater than the second depth. The kerogen-rich and mineral-rich particles are subsequently separated in order to recover the kerogen-rich particles. The mineral-rich particles are further processed using froth flotation.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: March 9, 1993
    Assignee: Amoco Corporation
    Inventor: Bernard Y. C. So
  • Process for converting methanol to olefins or gasoline
    Patent number: 5191142
    Abstract: A process for efficiently converting methanol to C.sub.3 -C.sub.12 olefins or paraffinic gasoline components is disclosed. A gaseous reaction mixture containing methanol and olefins is contacted with a solid acid catalyst in a reaction zone under conditions whereby a positive methanol concentration is maintained throughout the reaction zone. The process provides extended catalyst life, reduced deactivation rates, improved yields, and enhanced selectively for valuable products.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: March 2, 1993
    Assignee: Amoco Corporation
    Inventors: Christopher L. Marshall, Jeffery T. Miller
  • Blends of polyether sulfones and polyimides
    Patent number: 5191035
    Abstract: Blends of a polyether sulfone and the polyimide of the dianhydride sulfonyl bis(phthalic anhydride) ("SPAN") and the diamine 1,4-bis(p-aminocumyl)benzene ("BAP"). The blends will comprise from about 10 to about 90 wt % polyether sulfone, preferably greater than about 50 wt % polyether sulfone, based on the total weights of polyether sulfone and polyimide. The blends exhibit good toughness and improved thermal performance over polyether sulfone alone while remaining readily processable, and have good mechanical properties including unexpectedly high stiffness as determined by high tensile modulus values. Blends of this invention also are surprisingly miscible, defined as exhibiting a single Tg value.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: March 2, 1993
    Assignee: Amoco Corporation
    Inventors: M. Jamal El-Hibri, James E. Harris, John L. Melquist
  • Selective dehydrogenation processes and catalysts
    Patent number: 5189234
    Abstract: A process for selectively dehydrogenating organic compounds, and particularly for dehydrogenating dimethyltetralins to dimethylnaphthalenes, by contacting the organic compound at an elevated temperature with a catalyst prepared by treating a composition comprising an alumina support material and platinum group metal with an excess amount of an alkaline solution of an alkali metal salt.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: February 23, 1993
    Assignee: Amoco Corporation
    Inventor: Jeffrey A. Amelse
  • High-impact polystyrene
    Patent number: 5189095
    Abstract: A first reactor is used to graft polystyrene to a rubber-like polymer. A second reactor is used to obtain a mixture of styrene and polystyrene. The effluent from both the first and the second reactors are fed into a quiescent reaction zone where phase inversion occurs. The phase inverted material is fed into post inversion reactors to substantially complete the polymerization of the styrene monomer, and any unreacted styrene monomer is driven off to form the improved high-impact polystyrene.
    Type: Grant
    Filed: December 16, 1991
    Date of Patent: February 23, 1993
    Assignee: Amoco Corporation
    Inventor: Richard A. Hall
  • Polyetherimide copolymers
    Patent number: 5189115
    Abstract: Novel polyetherimide copolymers comprising the reaction product of 2,2-bis(3',4'-dicarboxyphenyl)propane dianhydride, an aromatic bis(ether anhydride), and a diamine are described. The polyetherimide copolymers have improved thermal properties, are soluble in conventional solvents, and are compatible with other engineering resins.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: February 23, 1993
    Assignee: Amoco Corporation
    Inventor: John L. Melquist
  • Laboratory simulator of reactor for a petroleum refinery
    Patent number: 5186904
    Abstract: A laboratory instrument provides a small model reactor which better simulates a back mixed reactor containing a catalyst. The reactor is especially valuable for simulating commercial scale hydrotreating of petroleum resid, coal, and other non-distillable hydrocarbons to obtain some distillable products. An important feature is a magnetically driven pump completely enclosed within the reactor shell of the simulator. All embodiments provide a high temperature and pressure, low liquid to catalyst volume, model reactor where an entire process is carried out within the simulator shell under substantially the conditions prevailing in the full scale reactor.
    Type: Grant
    Filed: August 23, 1989
    Date of Patent: February 16, 1993
    Assignee: Amoco Corporation
    Inventors: David Lyzinski, Robert D. Buttke, James L. Taylor, William M. Hall
  • Regioselective nitration of diphenyl compounds
    Patent number: 5187294
    Abstract: A regioselective nitration process for diphenyl compounds which can be carried out at about ambient temperature in which each ring of the diphenyl compound is selectively nitrated in the para position to form the corresponding di(4-nitrophenyl) compound. Such compounds as diphenyl carbonate, 2,2-diphenylpropane, 2,2-diphenylhexafluoropropane, diphenyl sulfide, diphenyl ketone, diphenyl sulfone, and the like can be converted to an isomeric mixture containing an enhanced amount of the corresponding di(4-nitrophenyl) compound, which mixture may be reduced or purified and reduced to the di(4-aminophenyl) analogues for use in the manufacture of polyamides, polyimides, and polyamide-imides.
    Type: Grant
    Filed: March 22, 1989
    Date of Patent: February 16, 1993
    Assignee: Amoco Corporation
    Inventor: Allen B. Mossman
  • Amide-imide resin having phthalic anhydride moieties
    Patent number: 5187254
    Abstract: A melt processible molding resin in which polymeric chains present therein comprise amide-imide repeating units having the following general formula: ##STR1## and wherein terminal amine groups of said polymeric chains are endcapped with phthalic anhydride moieties.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: February 16, 1993
    Assignee: Amoco Corporation
    Inventors: Howard B. Yokelson, James H. Han, Jeff J. Felberg