Patents by Inventor Mahendra S. Patel
Mahendra S. Patel 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: 5538929Abstract: Disclosed is a phosphorus treated activated carbon composition suitable for use as catalyst support, catalyst, and an adsorbent, which is produced by treating (e.g., by mixing or impregnating) an activated carbon material having a surface area greater than 100 m.sup.2 /g with a phosphorus-containing compound, drying, and heating to a temperature of from 450.degree. C. to about 1200.degree. C., wherein the resulting composition is characterized by a phosphorus compound combined with the carbon in the amount of from above 2.5% to about 10% phosphorus, based on the weight of the composition.Type: GrantFiled: August 9, 1994Date of Patent: July 23, 1996Assignees: Westvaco Corporation, Texaco, Inc.Inventors: Chakka Sudhakar, Robert K. Beckler, James R. Miller, Mahendra S. Patel
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Patent number: 5538930Abstract: A sulfided carbon support catalyst bearing (i) a non-noble Group VIII metal, (ii) a Group VI-B metal, and (iii) a metal of Group IA, II A, III-B, or the lanthanide Group of rare earths.Type: GrantFiled: March 17, 1995Date of Patent: July 23, 1996Assignee: Texaco Inc.Inventors: Chakka Sudhakar, Gerald G. Sandford, Phillip L. Dahlstrom, Mahendra S. Patel, Edwin L. Patmore
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Patent number: 5529968Abstract: A process for simultaneous hydrodearomatization, hydrodesulfurization and hydrodenitrogenation of a charge hydrocarbon oil containing undesired aromatic components, sulfur and nitrogen compounds, which comprises:maintaining a bed of a sulfided metal catalyst comprising one or more metals of non-noble Group VIII, at least one metal selected from tungsten and molybdenum on a novel "phosphorus treated carbon" support, the "phosphorus treated carbon" support being comprised of phosphorus bound to the carbon surface predominantly as polyphosphate species characterized by peaks between -5 and -30 ppm in the solid-state magic angle spinning .sup.31 p nuclear magnetic resonance spectrum;passing a charge hydrocarbon feed in the presence of hydrogen into contact with said catalyst at hydrotreating conditions, thereby effecting hydrodearomatization, and simultaneously effecting hydrodesulfurization and hydrodenitrogenation.Type: GrantFiled: May 16, 1995Date of Patent: June 25, 1996Assignee: Texaco Inc.Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max R. Cesar, Mahendra S. Patel, Paul O. Fritz
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Patent number: 5472595Abstract: A process for treating a charge hydrocarbon oil containing undesired aromatic components, sulfur and nitrogen compounds, which comprisesmaintaining a bed of a sulfided catalyst comprising 0.1 to 15% by weight of nickel; and from 1 to 50% by weight of tungsten and 0.01 to 10% by weight of phosphorus, on an activated carbon support, andpassing a charge hydrocarbon feed in the presence of hydrogen into contact with said catalyst at hydrotreating conditions, thereby effecting hydrodearomatization, hydrodesulfurization and hydrodenitrogenation of said charge hydrocarbon feed containing undesired aromatic components, sulfur and nitrogen, and forming a product stream of hydrocarbon containing a lesser quantity of undesired aromatic components, sulfur and nitrogen; andrecovering said product stream of hydrocarbon containing a lesser quantity of undesired aromatic components, sulfur and nitrogen.Type: GrantFiled: August 9, 1994Date of Patent: December 5, 1995Assignee: Texaco Inc.Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max R. Cesar, Mahendra S. Patel
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Patent number: 5462651Abstract: A process for simultaneous hydrodearomatization, hydrodesulfurization and hydrodenitrogenation of a charge hydrocarbon oil containing undesired aromatic components, sulfur and nitrogen compounds, which comprises:maintaining a bed of a sulfided metal catalyst comprising one or more metals of non-noble Group VIII, at least one metal selected from tungsten and molybdenum on a novel "phosphorus treated carbon" support, the "phosphorus treated carbon" support being comprised of phosphorus bound to the carbon surface predominantly as polyphosphate species characterized by peaks between -5 and -30 ppm in the solid-state magic angle spinning .sup.31 P nuclear magnetic resonance spectrum;passing a charge hydrocarbon feed in the presence of hydrogen into contact with said catalyst at hydrotreating conditions, thereby effecting hydrodearomatization, and simultaneously effecting hydrodesulfurization and hydrodenitrogenation.Type: GrantFiled: August 9, 1994Date of Patent: October 31, 1995Assignee: Texaco Inc.Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max R. Cesar, Mahendra S. Patel, Paul O. Fritz
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Patent number: 5423976Abstract: Hydrodesulfurization of cracked naphtha, with minimum attendant hydrogenation of olefins, is effected over a sulfided carbon support catalyst bearing (i) a non-noble Group VIII metal, (ii) a Group VI-B metal, and (iii) a metal of Group IA, II A, III B, or the lanthanide Group of rare earths.Type: GrantFiled: March 14, 1994Date of Patent: June 13, 1995Assignee: Texaco Inc.Inventors: Chakka Sudhakar, Gerald G. Sandford, Phillip L. Dahlstrom, Mahendra S. Patel, Edwin L. Patmore
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Patent number: 5376688Abstract: Pharmaceutically acceptable solutions of acidic, basic or amphoteric pharmaceutical agents are disclosed. These solutions are suitable for encapsulation in gelatin capsules for subsequent oral administration and include the pharmaceutical agent, an ion species and a solvent system.Type: GrantFiled: December 18, 1992Date of Patent: December 27, 1994Assignee: R. P. Scherer CorporationInventors: Frank S. S. Morton, Rickey S. Shelley, Mahendra S. Patel
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Patent number: 5372705Abstract: A method of catalytically hydroconverting a hydrocarbon feed stream containing a substantial quantity of components boiling above about 1000.degree. F. to convert a substantial portion thereof to components boiling below 1000.degree. F. is disclosed. More particularly, aromatic heavy oil additive, such as Heavy Cycle Gas Oil, is added to a heavy hydrocarbon feed stream and the stream is contacted with a solid catalyst and an oil-miscible metal naphthenate. The method disclosed herein advantageously substantially eliminates plugging of the hydroconversion reactor and minimizes the amount of insolubles in the total liquid product.Type: GrantFiled: November 6, 1992Date of Patent: December 13, 1994Assignee: Texaco Inc.Inventors: Ajit K. Bhattacharya, Jeffrey B. Harrison, Raymond J. Malouf, Mahendra S. Patel
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Patent number: 5358629Abstract: A waste molybdenum-containing stream recovered from the work-up of a reaction mixture wherein propylene has reacted with t-butyl hydroperoxide to form propylene oxide (in the presence of a complex of ethylene glycol and a molybdenum compound) is passed as an oil-miscible/soluble molybdenum-containing catalyst to a reaction wherein heavy hydrocarbon is hydroconverted to lower boiling products in the presence of heterogeneous catalyst.Type: GrantFiled: January 21, 1993Date of Patent: October 25, 1994Assignee: Texaco Inc.Inventors: George R. Tamalis, David D. Chess, Mahendra S. Patel, Ajit K. Bhattacharya, Robert M. Gipson
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Patent number: 4983638Abstract: A catalyst and method for preparing a mixture of lower aliphatic alcohols is provided. The method includes reacting a mixture of carbon monoxide and hydrogen under suitable conditions of temperature and pressure in the presence of a catalyst composition. The catalyst composition comprises rhodium, cobalt, molybdenum and cesium.Type: GrantFiled: July 17, 1989Date of Patent: January 8, 1991Assignee: Texaco Inc.Inventors: Suk-Fun Wong, David A. Storm, Mahendra S. Patel
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Patent number: 4980380Abstract: A catalyst and method for preparing a mixture of lower aliphatic alcohols is provided. The method includes reacting a mixture of carbon monoxide and hydrogen under suitable conditions of temperature and pressure in the presence of a catalyst composition. The catalyst composition comprises rhodium, cobalt, molybdenum and a combination of potassium and rubidium.Type: GrantFiled: July 17, 1989Date of Patent: December 25, 1990Assignee: Texaco Inc.Inventors: Suk-Fun Wong, David A. Storm, Mahendra S. Patel
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Patent number: 4918244Abstract: A process for preparing MTBE wherein TBA and MeOH are continuously fed to a rectification tower having a packed solid-acid catalyst bed where the TBA and MeOH react in the presence of the catalyst to produce MTBE.Type: GrantFiled: May 4, 1987Date of Patent: April 17, 1990Assignee: Texaco Inc.Inventors: Edward C. Nelson, David A. Storm, Mahendra S. Patel
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Patent number: 4058453Abstract: A process for recovering oil from either water-bituminous petroleum emulsions or from crude petroleum emulsions having a pH of 10 or less by adding thereto an optimum amount of non-ionic, water soluble polyethylene oxide polymers at a pH of 10 or less, and separating the oil from water. To resolve bituminous petroleum emulsions, the process is carried out at between 150.degree. F and 210.degree. F and a diluent is added to reduce the petroleum viscosity. The minimum effective concentration of the polymers used decreases as their molecular weight increases.In a modification of the process, an effective amount of an alkaline earth metal halide such as calcium chloride is added to improve coagulation and separation of any clay present.Type: GrantFiled: August 11, 1976Date of Patent: November 15, 1977Assignee: Texaco Exploration Canada Ltd.Inventors: Mahendra S. Patel, Aleksy Sacuta