Patents by Inventor Tansukhlal G. Dorawala

Tansukhlal G. Dorawala 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).

  • Membrane and separation process
    Patent number: 5358553
    Abstract: Mixtures of hydrogen and hydrocarbons may be separated by a membrane formed of a thin dense layer of platinum or palladium on the inside of a porous graphite tube.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: October 25, 1994
    Assignee: Texaco Inc.
    Inventors: Mitri S. Najjar, Tansukhlal G. Dorawala, Uygur Koturk
  • Ion exchange membrane
    Patent number: 5006576
    Abstract: A dilute solution of methyl ethyl ketone is concentrated by pervaporation through a fluorinated ion exchange membrane which has been exchanged with a quaternary ammonium cation.
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: April 9, 1991
    Assignee: Texaco Inc.
    Inventors: Mordechai Pasternak, Tansukhlal G. Dorawala
  • Separations of oxygenates
    Patent number: 4952318
    Abstract: A dilute solution of methyl ethyl ketone is concentrated by pervaporation through a fluorinated ion exchange membrane which has been exchanged with a quaternary ammonium cation.
    Type: Grant
    Filed: January 7, 1988
    Date of Patent: August 28, 1990
    Assignee: Texaco Inc.
    Inventors: Mordechai Pasternak, Tansukhlal G. Dorawala
  • Solvent dewaxing process
    Patent number: 4898674
    Abstract: Solvent dewaxing of charge lubricating oil stocks requiring different ratios of methyl ethyl ketone to toluene is effected by adjusting the ratio of components in the dewaxing solvent by a membrane.
    Type: Grant
    Filed: March 24, 1988
    Date of Patent: February 6, 1990
    Assignee: Texaco Inc.
    Inventors: Mordechai Pasternak, Tansukhlal G. Dorawala
  • Treatment of water
    Patent number: 4872991
    Abstract: Aqueous liquor containing immiscible hydrocarbon liquid, such as produced water from an offshore petroleum drilling platform, is treated by gravity separation, skimming, and nanofiltration.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: October 10, 1989
    Assignee: Texaco Inc.
    Inventors: Craig R. Bartels, Tansukhlal G. Dorawala, Michael T. Stephenson, Mordechai Pasternak, John Reale, Jr.
  • Catalyst for steam dehydrocyclization
    Patent number: 4360454
    Abstract: Steam dehydrocyclization of paraffinic hydrocarbons to aromatic hydrocarbons is effected in the presence of catalyst, typically a supported rhodium catalyst bearing copper.
    Type: Grant
    Filed: June 18, 1981
    Date of Patent: November 23, 1982
    Assignee: Texaco Inc.
    Inventors: Richard F. Love, Tansukhlal G. Dorawala, Edwin R. Kerr
  • Steam regeneration of rhodium containing hydrocarbon dehydrocyclization catalysts
    Patent number: 4344865
    Abstract: Steam dehydrocyclization of paraffinic hydrocarbons to aromatic hydrocarbons is effected in the presence of supported catalyst, typically bearing rhodium and preferably chromium and potassium, and characterized by a pH less than about 8.
    Type: Grant
    Filed: February 5, 1981
    Date of Patent: August 17, 1982
    Assignee: Texaco Inc.
    Inventors: Russell R. Reinhard, Tansukhlal G. Dorawala, Edwin R. Kerr
  • Steam dehydrocyclization of paraffinic hydrocarbons in the presence of catalyst containing Group VIII metal and an activating amount of a Group I B metal
    Patent number: 4320240
    Abstract: Steam dehydrocyclization of paraffinic hydrocarbons to aromatic hydrocarbons is effected in the presence of catalyst, typically a supported rhodium catalyst bearing copper.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: March 16, 1982
    Assignee: Texaco Inc.
    Inventors: Richard F. Love, Tansukhlal G. Dorawala, Edwin R. Kerr
  • Steam dealkylation process
    Patent number: 4310715
    Abstract: Alkylaromatic hydrocarbons are dealkylated in a short cycle process characterized by a reaction period of 30-180 seconds followed by a regeneration period of 90-540 seconds--thus permitting attainment of improved conversion and yield of desired product.
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: January 12, 1982
    Assignee: Texaco, Inc.
    Inventors: Tansukhlal G. Dorawala, Russell R. Reinhard, Edwin R. Kerr
  • Dehydrocyclization to aromatic hydrocarbons over rhodium catalyst
    Patent number: 4304658
    Abstract: Steam dehydrocyclization of paraffinic hydrocarbons to aromatic hydrocarbons is effected in the presence of supported catalyst, typically bearing rhodium and preferably chromium and potassium, and characterized by a pH less than about 8.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: December 8, 1981
    Assignee: Texaco Inc.
    Inventors: Russell R. Reinhard, Tansukhlal G. Dorawala, Edwin R. Kerr
  • Coal liquefaction
    Patent number: 4298452
    Abstract: Solid fuel is liquefied at elevated temperature and pressure in the presence of a solvent, water and a material which decomposes to carbon monoxide and hydrogen.
    Type: Grant
    Filed: March 28, 1980
    Date of Patent: November 3, 1981
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Edwin R. Kerr
  • Steam dealkylation catalyst and a method for its activation
    Patent number: 4215018
    Abstract: Alkylaromatic hydrocarbons are dealkylated in the presence of a catalyst typically containing oxides of nickel, potassium, and aluminum.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: July 29, 1980
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Russell R. Reinhard
  • Process for dealkylating an alkylaromatic hydrocarbon using supported catalyst
    Patent number: 4147734
    Abstract: A novel active alumina which has been treated with sulfate ion, is found to be particularly characterized by increased performance when used as a support for catalyst which may be used in hydrocarbon conversion processes such as steam dealkylation.
    Type: Grant
    Filed: April 1, 1977
    Date of Patent: April 3, 1979
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Edwin R. Kerr, Robert G. Kochis, Leon F. Koniz
  • Novel method for preparing a high purity alumina
    Patent number: 4139491
    Abstract: A novel active alumina which has been treated with sulfate ion, is found to be particularly characterized by increased performance when used as a support for catalyst which may be used in hydrocarbon conversion processes such as steam dealkylation.
    Type: Grant
    Filed: March 20, 1978
    Date of Patent: February 13, 1979
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Edwin R. Kerr, Robert G. Kochis, Leon F. Koniz
  • Catalyst for dealkylating an alkylaromatic hydrocarbon
    Patent number: 4139496
    Abstract: Alkylaromatic hydrocarbons are steam dealkylated in the presence of catalyst, typically containing oxides of nickel, potassium, chromium and aluminum, and particularly characterized by the presence of free nickel metal having a metallic surface area of preferably at least about 8 square meters per gram of catalyst.
    Type: Grant
    Filed: December 8, 1976
    Date of Patent: February 13, 1979
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Russell R. Reinhard, Paul H. Lewis
  • Steam dealkylation
    Patent number: 4136129
    Abstract: Alkylaromatic hydrocarbons are dealkylated in the presence of a catalyst typically containing oxides of nickel, potassium, and aluminum.
    Type: Grant
    Filed: November 10, 1977
    Date of Patent: January 23, 1979
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Russell R. Reinhard
  • Steam dealkylation with hydrogen treated catalyst of groups I, VI B, VIII
    Patent number: 4075255
    Abstract: Alkylaromatic hydrocarbons are dealkylated with steam in the presence of catalyst (typically containing oxides of nickel, potassium, chromium, and aluminum) which has been hydrogen-treated at high temperature.
    Type: Grant
    Filed: August 26, 1976
    Date of Patent: February 21, 1978
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Russell R. Reinhard, John H. Estes
  • Steam reforming of polycyclic hydrocarbons
    Patent number: 4053531
    Abstract: Polycyclic aromatic hydrocarbons are treated with steam in the presence of catalyst, typically containing oxides of nickel, potassium, chromium, and aluminum, to form aromatic products containing a lesser number of aromatic rings.
    Type: Grant
    Filed: September 29, 1975
    Date of Patent: October 11, 1977
    Assignee: Texaco Inc.
    Inventors: Edwin R. Kerr, Tansukhlal G. Dorawala, Russell R. Reinhard
  • Steam reforming process
    Patent number: 4046869
    Abstract: Hydrocarbons are reformed in a short cycle process characterized by a reaction period of 30-180 seconds followed by a regeneration period of 90-540 seconds -- thus permitting attainment of improved conversion and yield of hydrogen.
    Type: Grant
    Filed: February 11, 1976
    Date of Patent: September 6, 1977
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Russell R. Reinhard
  • Steam dealkylation catalyst and process for preparing it
    Patent number: 4008181
    Abstract: Alkylaromatic hydrocarbons are dealkylated with steam in the presence of catalyst (typically containing oxides of nickel, potassium, chromium, and aluminum) which has been hydrogen-treated at high temperature.
    Type: Grant
    Filed: September 4, 1975
    Date of Patent: February 15, 1977
    Assignee: Texaco Inc.
    Inventors: Tansukhlal G. Dorawala, Russell R. Reinhard, John H. Estes