Patents by Inventor Chakka Sudhakar

Chakka Sudhakar 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).

  • Publication number: 20030094400
    Abstract: A process for removing sulfur from hydrocarbon streams is described. The organic sulfur compounds are first oxidized to create oxidized sulfur in the hydrocarbon stream and then processing the hydrocarbon stream with hydrogen at hydrodesulfurization conditions to reduce the sulfur to hydrogen sulfide, leaving a hydrocarbon gas stream substantially free of sulfur.
    Type: Application
    Filed: May 23, 2002
    Publication date: May 22, 2003
    Inventors: Robert Edward Levy, Alkis Stavros, Chakka Sudhakar, Vincent Paul Nero, Stephen Jude DeCanio
  • Patent number: 6547957
    Abstract: A catalyst assisted upgrading process for treating a hydrocarbon oil feed to reduce total acid number (TAN) and increase API gravity is provided herein which employs a hydroprocessing catalyst based on a catalyst support, e.g., alumina. The process includes blending the supported hydroprocessing catalyst with the hydrocarbon oil feed to form a slurry which is then treated with hydrogen at moderate temperature and pressure in, for example, a tubular reactor. Deposit formation is thus minimized or avoided.
    Type: Grant
    Filed: October 17, 2000
    Date of Patent: April 15, 2003
    Assignee: Texaco, Inc.
    Inventors: Chakka Sudhakar, Mark Timothy Caspary, Stephen Jude DeCanio
  • Patent number: 6162351
    Abstract: A naphtha or a middle distillate hydrocarbon is hydrodenitrogenized by hydrotreating in the presence of a catalyst containing a carbon support bearing (i) molybdenum or tungsten, (ii) a metal of non-noble Group VIII, and (iii) chromium.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: December 19, 2000
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max Raphael Cesar
  • Patent number: 5928501
    Abstract: A process for treating a hydrocarbon oil feed to reduce total acid number (TAN) and increase API gravity employs a catalyst which includes one or more metals of non-noble Group VIII of the periodic table (e.g., iron, cobalt and nickel), and at least one metal selected from Group VIB (e.g., chromium, tungsten and molybdenum) on a 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. The process includes blending the catalyst with the hydrocarbon oil feed to form a slurry which is then treated with hydrogen at moderate temperature and pressure in, for example, a tubular reactor. Deposit formation is minimized or avoided.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: July 27, 1999
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Mark T. Caspary, Stephen J. DeCanio
  • Patent number: 5851382
    Abstract: Hydrodesulfurization of cracked naphtha, with minimum attendant hydrogenation of olefins, is effected over a sulfided catalyst bearing (i) a non-noble Group VIII metal, and (ii) a Group VI-B metal, and (iii) a metal of Group I-A, and optionally (iv) a metal of Group II-A, on a support comprising hydrotalcite-like composition, optionally containing less than or equal to 20% by weight of an inert inorganic compound selected from the group consisting of silica, silica-alumina, titania, clays, carbon black, and mixtures thereof, used as a binder.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: December 22, 1998
    Assignee: Texaco Inc.
    Inventor: Chakka Sudhakar
  • Patent number: 5846406
    Abstract: Selective hydrodesulfurization of cracked naphtha, with minimum attendant hydrogenation of olefins, is effected over a novel catalyst composition comprising a sulfided, "manganese oxide octahedral molecular sieve" supported catalyst bearing (i) at least one non-noble Group VIII metal, (ii) at least one Group VI-B metal, optionally (iii) at least one metal of Group I-A, II-A, III-B, or the lanthanide series of rare earths, and optionally (iv) at least one metal of Group I-B. The catalyst of the present invention is highly selective in minimizing the olefin saturation and the resulting octane loss in the cracked naphtha hydrodesulfurization process.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: December 8, 1998
    Assignee: Texaco Inc
    Inventors: Chakka Sudhakar, Chi-Lin O'Young
  • Patent number: 5837640
    Abstract: A naphtha or a middle distillate hydrocarbon is dehydroaromatized by hydrotreating in the presence of a catalyst containing non-noble Group VIII metal and Group VI-B metal on carbon.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: November 17, 1998
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Dennis Joseph Rao, John Hazen
  • Patent number: 5817229
    Abstract: A hydrocarbon feedstock is brought into contact with activated carbon at a temperature of about 300.degree. to about 650.degree. C. and a pressure of about 0-1000 psig in the absence of added hydrogen to reduce the content of aromatic, sulfur and nitrogen compounds contained therein and to simultaneously lower the specific gravity thereof.
    Type: Grant
    Filed: November 6, 1996
    Date of Patent: October 6, 1998
    Assignee: Texaco Inc
    Inventors: Chakka Sudhakar, Regis J. Pellet, Mahendra Somabhai Patel
  • Patent number: 5770046
    Abstract: Hydrodesulfurization of cracked naphtha, with minimum attendant hydrogenation of olefins, is effected over a sulfided, carbon supported catalyst bearing (i) at least one non-noble Group VIII metal, (ii) at least one Group VI-B metal, (iii) at least one metal of Group I-A, II-A, III-B, or the lanthanide series of rare earths, and (iv) at least one metal of Group I-B.
    Type: Grant
    Filed: December 18, 1995
    Date of Patent: June 23, 1998
    Assignee: Texaco Inc
    Inventor: Chakka Sudhakar
  • Patent number: 5676822
    Abstract: A process for treating a charge hydrocarbon oil containing undesired aromatic components, sulfur and nitrogen compounds, which comprises maintaining a bed of a sulfided catalyst comprising 0.1 to 15% by weight of one or more non-noble Group VIII metals; and from 1 to 50% by weight of tungsten and/or from 1 to 20% by weight or molybdenum or chromium, and 0.01 to 10% by weight of zinc, on an activated carbon support, passing a charge hydrocarbon feed in the presence of hydrogen into contact with said catalyst at hydrotreating conditions, thereby effecting hydrogenation, 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 concentration of undesired aromatic components, sulfur and nitrogen; and recovering said product stream of hydrocarbon containing a lesser concentration of undesired aromatic components, sulfur and nitrogen.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: October 14, 1997
    Assignee: Texaco Inc.
    Inventor: Chakka Sudhakar
  • Patent number: 5651878
    Abstract: A naphtha or a middle distillate hydrocarbon is hydrodearomatized by hydrotreating in the presence of a catalyst containing a carbon support bearing (i) molybdenum or tungsten, (ii) a metal or non-noble Group VIII, and (iii) chromium.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: July 29, 1997
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max Raphael Cesar
  • Patent number: 5624547
    Abstract: Disclosed is a process for pretreatment of hydrocarbon feed containing sulfur and nitrogen compounds and aromatics prior to hydrocracking or fluid catalytic cracking which comprises:contacting said feedstock with a sulfided catalyst comprising a metal of non-noble Group VIII and Group VIB, and, optionally one or more elements selected from Group IIIA and Group VA of the Periodic Table on a carbon support consisting essentially of activated carbon, optionally on a carbon support treated with phosphorus, having a B.E.T. (Braunauer-Emmett Teller) surface area of at least 100 m.sup.2 /g and an average Pore Diameter greater than 12.ANG. and a Total Pore Volume greater than 0.3 cc/g.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: April 29, 1997
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Paul O. Fritz, Carl J. Kjellson, Hua-Min Huang, Gerald G. Sandford
  • Patent number: 5556824
    Abstract: A naphtha or a middle distillate hydrocarbon is hydrodearomatized by hydrotreating in the presence of a catalyst containing boron, non-noble Group VIII metal, and Group VIB metal on a carbon support.
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: September 17, 1996
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max R. Cesar, Jeffrey G. Weissman
  • Patent number: 5538930
    Abstract: 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: Grant
    Filed: March 17, 1995
    Date of Patent: July 23, 1996
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Gerald G. Sandford, Phillip L. Dahlstrom, Mahendra S. Patel, Edwin L. Patmore
  • Patent number: 5538929
    Abstract: 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: Grant
    Filed: August 9, 1994
    Date of Patent: July 23, 1996
    Assignees: Westvaco Corporation, Texaco, Inc.
    Inventors: Chakka Sudhakar, Robert K. Beckler, James R. Miller, Mahendra S. Patel
  • Patent number: 5529968
    Abstract: 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: Grant
    Filed: May 16, 1995
    Date of Patent: June 25, 1996
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max R. Cesar, Mahendra S. Patel, Paul O. Fritz
  • Patent number: 5525211
    Abstract: Naphtha is selectively hydrodesulfurized using selectively poisoned hydrotreating catalyst to remove sulfur while minimizing loss in octane level due to olefin saturation.
    Type: Grant
    Filed: October 6, 1994
    Date of Patent: June 11, 1996
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Max R. Cesar, R. Anthony Heinrich
  • Patent number: 5500401
    Abstract: A method of selectively hydrodenitrogenating various raw hydrocarbon oils such as various petroleum feedstocks, coal liquids, shale oils and sand oils, which method comprises passing the raw hydrocarbon oil along with hydrogen (H.sub.2) over sulfided carbon supported Fe-Mo catalysts, whereby the raw hydrocarbon oil is hydrodenitrogenated with a selectivity significantly higher than that is possible with conventional alumina supported hydrotreating catalysts.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: March 19, 1996
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Gerald G. Sandford, Frank Dolfinger, Jr.
  • Patent number: 5472595
    Abstract: 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: Grant
    Filed: August 9, 1994
    Date of Patent: December 5, 1995
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max R. Cesar, Mahendra S. Patel
  • Patent number: 5462651
    Abstract: 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: Grant
    Filed: August 9, 1994
    Date of Patent: October 31, 1995
    Assignee: Texaco Inc.
    Inventors: Chakka Sudhakar, Frank Dolfinger, Jr., Max R. Cesar, Mahendra S. Patel, Paul O. Fritz