Patents Represented by Attorney George J. Darsa
  • Patent number: 5440000
    Abstract: A dispersant/antioxidant bound, Viscosity Index-improving methacrylate polymer composition having a molecular weight ranging from about 20,000 to about 2,500,000. The composition comprises a base oil and methacrylate monomers and antioxidant monomer with inherent dispersancy. The composition being prepared by:(a) mixing a antioxidant/dispersant monomer with alkyl methacrylates and an oil solvent to provide an intermediate reaction mixture;(b) stirring and purging said reaction mixture by nitrogen ebullation for about 25-35 minutes at about 200 ml/min;(c) heating said purged mixture to about 75.degree.-85.degree. C.;(d) adding both a chain transfer agent and a radical polymerization catalyst to said heated mixture and then after about 2.0 hours adding an additional amount of said catalyst to said heated mixture, and then heating said heated mixture for an additional 2.0 hours;(e) increasing the temperature of said heated mixture to about 95.degree.-105.degree. C.
    Type: Grant
    Filed: July 18, 1994
    Date of Patent: August 8, 1995
    Assignee: Texaco Inc.
    Inventors: Shailaja M. Shirodkar, Nicholas Benfaremo, Rosemary J. Jennejahn
  • Patent number: 5438028
    Abstract: A method of enhancing the activity of a catalyst for the hydroprocessing of hydrocarbons, comprising:(a) applying a modifying element dissolved in a solvent onto the surface of a finished catalyst;(b) drying said modified finished catalyst to remove all free solvent from said catalyst;(c) optionally, heating said dried, modified finished finished catalyst at a temperature of about 120.degree. C. to about 1000.degree. C. at a rate of 1.degree.-20.degree. C. per minute, and holding said dried catalyst at a temperature of about 120.degree. C. to about 1000.degree. C. up to 48 hours to provide an enhanced finished catalyst; and(d) recovering said enhanced finished catalyst.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: August 1, 1995
    Assignee: Texaco Inc.
    Inventors: Jeffrey G. Weissman, Elaine C. DeCanio, Thomas G. C. Nelson, Denise C. Tebbens
  • Patent number: 5433018
    Abstract: The present invention includes a purge chamber which includes a chamber holding the interlocking solid material. An entrance port apparatus passes the interlocking solid material into the chamber where it is purged by a purging gas. An exit port apparatus passes the solid interlocking solid material from the chamber. Located within the chamber is other apparatus which move the interlocking solid material from the chamber through the exit port apparatus and other apparatus which prevent the binding of the interlocking solid material.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: July 18, 1995
    Assignee: Texaco Inc.
    Inventors: Vahan Avetisian, Constantin Bugescu, Craig J. Castagnoli, Suk-Bae Cha
  • Patent number: 5429757
    Abstract: An additive composition comprising a graft and derivatized copolymer prepared from ethylene and at least one (C.sub.3 -C.sub.10) alpha-monoolefin and, optionally, a polyene selected from non-conjugated dienes and trienes comprising from about 15 to 80 mole percent of ethylene, from about 20 to 85 mole percent of said (C.sub.3 -C.sub.10) alpha-monoolefin and from about 0 to 15 mole percent of said polyene having an average molecular weight ranging from about 5,000 to 500,000, which has been reacted with at least one olefinic carboxylic acid acylating agent to form one or more acylating reaction intermediates characterized by having a carboxylic acid acylating function within their structure and reacting said reaction intermediate with an amino-aromatic compound to form said graft derivatized copolymer, and a lubricating oil composition containing same are provided.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: July 4, 1995
    Assignee: Texaco Inc.
    Inventors: Munmaya K. Mishra, Isaac D. Rubin
  • Patent number: 5423950
    Abstract: The reactor forms a chamber which contains the reaction process. There are accesses to the chamber for receiving shredded tires and oil. There are egresses from the chamber for discharging the tire oil and for discharging unreacted elements. Apparatus is located within the chamber which separates the unreacted components of the shredded tires from the tire oil. The apparatus also provides for the removal of the unreacted elements from the chamber means. The reactor also includes a heater which heats the inside of the chamber to a temperature sufficient to cause a reaction between the shredded tires and the oil.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: June 13, 1995
    Assignee: Texaco Inc.
    Inventors: Vahan Avetisian, Constantin Bugescu, Robert S. Burton, III, Craig J. Castagnoli, Suk-Bae Cha, Kenneth S. Lee, Allen M. Robin
  • Patent number: 5423992
    Abstract: A chemically disinfected sewage sludge-containing material comprising (1) an aqueous slurry of sewage sludge-containing material having a solids content in the range of about 10 to 30 wt. %; and (2) a chemical disinfectant comprising a water soluble silicate of sodium in the amount of 5 to 20 wt. % (basis dry wt. of said sewage sludge). In one embodiment, a pumpable chemically disinfected sewage sludge-containing material was produced by the steps of (1) dewatering sewage sludge to produce an aqueous slurry having a solids content of about 10 to 30 wt. %; (2) shearing the dewatered sewage sludge from (1) at a temperature in the range of about ambient to 230.degree. F. and at a shear rate of at least 30 per second for a period in the range of about 0.5 to 180 minutes; and (3) mixing the following materials together at a temperature in the range of about ambient to 230.degree. F. to produce a pumpable aqueous slurry having a solids content in the range of about 30 to 65 wt.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: June 13, 1995
    Assignee: Texaco Inc.
    Inventors: Matthew A. McMahon, Mitri S. Najjar, Peter D. Robison, Ronald J. McKeon
  • Patent number: 5423894
    Abstract: Pumpable aqueous slurries of low rank coal e.g. subbituminous coal and lignite having a comparatively high solids content are made by keeping the particles of coal in contact with a non-oxidizing gas e.g. nitrogen and/or CO.sub.2 thereby maintaining a hydrophobic surface on the particles of coal while they are ground and dried, contacted with an aqueous slurry of liquid hydrocarbonaceous fuel which is absorbed and which coats the particles of coal, and then dried. The dried coated particles of low rank coal are mixed with water to produce a pumpable slurry having a solids content in the range of about 50 to 60 wt. %. In one embodiment, at least a portion of the water needed to produce said pumpable slurry is derived by cooling and condensing out water from the non-oxidizing gas that was used to dry the low rank coal. In still another embodiment, the dewatered non-oxidizing gas is introduced into the combustor of a gas turbine to moderate the temperature and thereby reduce the formation of NO.sub.x gases.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: June 13, 1995
    Assignee: Texaco Inc.
    Inventors: Edward T. Child, William L. Lafferty, Jr., Motasimur R. Khan
  • Patent number: 5415673
    Abstract: A partial oxidation process for the production of a stream of cooled and cleaned synthesis gas, reducing gas, or fuel gas substantially free from entrained particulate matter and slag. The hot raw gas stream from the partial oxidation gas generator is quench cooled with deaerated grey water in a quench tank to produce black quench water or cooled in a radiant and/or convection cooler. The cooled gas is scrubbed with deaerated grey water in a scrubbing zone to remove all of the entrained particulate matter and to produce black scrubbing waters. The black water is resolved in a flashing zone and reused by flashing it in two or three flash stages connected in series and separating the overhead flash vapors comprising vaporized grey water and sour gas from the bottoms comprising concentrated black water. The flash vapors from the first flash stage are used to heat a stream of deaerated grey water being recycled to the quench tank and gas scrubbing zone or to the gas scrubbing zone.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: May 16, 1995
    Assignee: Texaco Inc.
    Inventors: Joanne L. Hilton, Frederick B. Seuffert, Erwin A. Reich
  • Patent number: 5414090
    Abstract: An adduct of 2,5-dimercapto-1,2,4 -thiadiazole, an epoxide, a formaldehyde and 4,4'-isopropylidenediphenol represented by the formula ##STR1## where A is H or ##STR2## where R is H or a (C.sub.1 -C.sub.30) alkyl group and n=1-4.
    Type: Grant
    Filed: November 2, 1993
    Date of Patent: May 9, 1995
    Assignee: Texaco Inc.
    Inventors: Doris Love, Julian H. Dancy, Jayne M. Lucas
  • Patent number: 5405544
    Abstract: Beta-hydroxyalkyl-bis(alkylthiomethylphenyl) dithiophosphate esters represented by the formulas ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each H, a (C.sub.1 -C.sub.40) alkyl group, --CH.sub.2 SR, --C.sub.6 H.sub.5 or --C.sub.6 H.sub.4 --R.sub.5 providing at least one of R.sub.1, R.sub.2 and R.sub.3 is --CH.sub.2 SR; R.sub.4 is H or a (C.sub.1 -C.sub.40) alkyl group; R is H or a (C.sub.1 -C.sub.40) alkyl group, --C.sub.6 H.sub.5 or --C.sub.6 H.sub.4 --R.sub.5 ; and R.sub.5 is a (C.sub.1 -C.sub.40) alkyl group.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: April 11, 1995
    Assignee: Texaco Inc.
    Inventors: Carl K. Esche, Jr., Julian H. Dancy, Doris Love
  • Patent number: 5403366
    Abstract: A partial oxidation process for the production of a stream of hot clean gas substantially free from particulate matter, alkali metal compounds, hydrogen halides, hydrogen cyanide, sulfur-containing gases, and with or without ammonia for use as synthesis gas, reducing gas, or fuel gas. A pumpable hydrocarbonaceous fuel selected from the group consisting of liquid hydrocarbonaceous fuel or liquid emulsions thereof, an aqueous slurry of petroleum coke, and mixtures thereof and wherein said hydrocarbonaceous fuel contains halides, alkali metal compounds, sulfur, nitrogen and inorganic ash containing components, is reacted in a gasifier by partial oxidation to produce a hot raw gas stream comprising H.sub.2, CO, CO.sub.2, H.sub.2 O, CH.sub.4, NH.sub.3, HCN, HCl, HF, H.sub.2 S, COS, N.sub.2, Ar, particulate matter, vapor phase alkali metal compounds, and molten slag. The hot raw gas stream from the gasifier is cooled in a radiant cooler and cleaned.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: April 4, 1995
    Assignee: Texaco Inc.
    Inventors: Thomas F. Leininger, Allen M. Robin, James K. Wolfenbarger, Robert M. Suggitt
  • Patent number: 5403560
    Abstract: Internal components for a vertical downflow reactor include a closed-ended conduit having an internal baffle and longitudinal exit slots proximate its closed end for the symmetrical introduction of quench fluid into a quench zone. An interzone mixing configuration is in vertical communication with the bottom of the quench zone. An inwardly sloping collector tray has an opening concentric with the vertical axis of the reactor vessel. A mixing device is provided for mixing the liquid and vapor components entering from above the collector tray and conveying the mixed vapor and liquid downwardly through the opening. Flow deflectors are positioned immediately below the collector tray opening for directing liquid flow towards the axial centerline of the reactor. A collection pan is positioned below and in axial alignment with the collector tray to capture and retain the liquid.
    Type: Grant
    Filed: May 13, 1993
    Date of Patent: April 4, 1995
    Assignee: Texaco Inc.
    Inventors: Vijay A. Deshpande, John C. Strickland, George K. Perry, Robert M. Steinberg, Ting Y. Chan, Lalit S. Shah
  • Patent number: 5401282
    Abstract: A partial oxidation process for the production of a stream of hot clean gas substantially free from particulate matter, ammonia, alkali metal compounds, halides and sulfur-containing gas for use as synthesis gas, reducing gas, or fuel gas. A hydrocarbonaceous fuel comprising a solid carbonaceous fuel with or without liquid hydrocarbonaceous fuel or gaseous hydrocarbon fuel, wherein said hydrocarbonaceous fuel contains halides, alkali metal compounds, sulfur, nitrogen and inorganic ash containing components, is reacted in a gasifier by partial oxidation to produce a hot raw gas stream comprising H.sub.2, CO, CO.sub.2, H.sub.2 O, CH.sub.4, NH.sub.3, HCl, HF, H.sub.2 S, COS, N.sub.2, Ar, particulate matter, vapor phase alkali metal compounds, and molten slag. The hot raw gas stream from the gasifier is split into two streams which are separately deslagged, cleaned and recombined. Ammonia in the gas mixture is catalytically disproportionated into N.sub.2 and H.sub.2.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: March 28, 1995
    Assignee: Texaco Inc.
    Inventors: Thomas F. Leininger, Allen M. Robin, James K. Wolfenbarger, Robert M. Suggitt
  • Patent number: 5393914
    Abstract: The present invention provides a novel class of compounds, useful as gasoline detergent additives, comprising hydrocarbyloxypolyether allophonate esters of 2-hydroxy ethane. The present invention also provides a motor fuel composition containing the novel allophonate esters and further provides a method of synthesizing the allophonate esters of the present invention.
    Type: Grant
    Filed: September 1, 1992
    Date of Patent: February 28, 1995
    Assignee: Texaco Inc.
    Inventors: Sheldon Herbstman, Cadorette, Constance A.
  • Patent number: 5374364
    Abstract: Multifunctional viscosity index improvers for lubricating oils containing an EPM or EPDM polymer with pendant thiazoline units.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: December 20, 1994
    Assignee: Texaco Inc.
    Inventors: Maria M. Kapuscinski, Nicholas Benfaremo, Robert T. Biggs
  • Patent number: 5370803
    Abstract: A method of preparing a lubricant detergent additive at a significantly enhanced filtration rate comprising the steps of:(a) mixing a neutral calcium sulfonate with sulfur, diluent oil, (C.sub.5 -C.sub.40) alkylphenol, ethylene glycol, and calcium hydroxide to form a mixture;(b) agitating said mixture at a temperature of about 150.degree. C. to about 200.degree. C. for a period of about four hours;(c) bubbling CO.sub.2 into said agitated mixture to provide an intermediate product; and(d) filtering said intermediate product at a rate of about 50 ml per 3 to 6 minutes to provide the lubricant detergent additive.
    Type: Grant
    Filed: September 3, 1993
    Date of Patent: December 6, 1994
    Assignee: Texaco Inc.
    Inventors: Carl K. Esche, Jr., James W. Moore
  • Patent number: 5366651
    Abstract: Antifreeze concentrate is disclosed having water soluble liquid alcohol freezing point depressant and corrosion inhibitor comprising carboxylic acids or their salts and a triazole compound, wherein the concentrate contains: (1) C.sub.5 -C.sub.16 aliphatic monobasic acid or the alkali metal, ammonium or amine salt thereof; (2) hydrocarbyl triazole; and (3) imidazole.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: November 22, 1994
    Assignee: Texaco Services (Europe) Ltd.
    Inventors: Jean-Pierre Maes, Walter A. van Neste
  • Patent number: 5358696
    Abstract: This invention relates to the production of hydrogen-rich gas by the partial oxidation of a saturated gaseous hydrocarbonaceous fuel or a mixture of saturated gaseous hydrocarbonaceous fuel and a liquid hydrocabonaceous fuel in a gas generator. In the process, a saturated gaseous hydrocarbonaceous fuel from a subsequent fuel gas saturator is preheated by indirect heat exchange with a portion of shifted process gas stream from a catalytic water-gas direct shift conversion zone and reacted in said partial oxidation gas generator. The process gas stream from the noncatalytic partial oxidation gas generator is quench cooled and scrubbed with water and preheated by indirect heat exchange with a second portion of the process gas stream from the shift conversion zone prior to catalytically reacting the CO and H.sub.2 O in the process gas stream in the shift conversion zone to increase its H.sub.2 content.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: October 25, 1994
    Assignee: Texaco Inc.
    Inventor: Frederick C. Jahnke
  • Patent number: 5340562
    Abstract: A process of synthesizing synthetic manganese oxide hydrates having various structures including hollandite and todorokite structure by hydrothermal synthesis. The products have a high degree of crystallinity, and thermal stability.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: August 23, 1994
    Assignee: Texaco Inc.
    Inventors: Chi-Lin O'Young, Yan-Fei Shen, Richard P. Zerger, Steven L. Suib
  • Patent number: 5338489
    Abstract: Slag deposits in partial oxidation reactors, like coke gasifiers, are removed by controlling temperature and slag derivatization. Derivatized slag is fluidized and leaves the reactor without solidifying in and filling the reactor outlet.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: August 16, 1994
    Assignee: Texaco Inc.
    Inventors: Dick Y. Jung, James K. Wolfenbarger, Donald D. Brooker, Allen M. Robin, Jerrold S. Kassman