Patents by Inventor Swati Karmakar

Swati Karmakar 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).

  • Heteropoly acids supported on polyoxometallate salts and their preparation
    Patent number: 6043184
    Abstract: Alkanes are converted to unsaturated carboxylic acids by contacting an alkane with an oxidizing agent and a heteropolyacid supported on wide pore polyoxometallate salts.
    Type: Grant
    Filed: January 5, 1998
    Date of Patent: March 28, 2000
    Assignees: Sunoco, Inc. (R&M), Rohm and Haas Company
    Inventors: Swati Karmakar, Anthony F. Volpe, Jr., Paul E. Ellis, Jr., James E. Lyons
  • Conversion of alkanes to unsaturated carboxylic acids over heteroploy acids supported on polyoxometallate salts
    Patent number: 5990348
    Abstract: Alkanes are converted to unsaturated carboxylic acids by contacting an alkane with an oxidizing agent and a heteropolyacid supported on wide pore polyoxometallate salts.
    Type: Grant
    Filed: January 5, 1998
    Date of Patent: November 23, 1999
    Assignees: Sunoco, Inc., Rohm and Haas Company
    Inventors: James E. Lyons, Anthony F. Volpe, Paul E. Ellis, Jr., Swati Karmakar
  • Catalysts for hydroxylation and ammination of aromatics using molecular oxygen as the terminal oxidant without coreductant
    Patent number: 5981424
    Abstract: Catalyst compositions are disclosed which are useful for the hydroxylation and the ammination of aromatic hydrocarbons using molecular oxygen as terminal oxidant. The catalysts comprise a support selected from the group consisting of metal oxides, molecular sieves, zeolites and clays; transition metal selected from the group consisting of vanadium, niobium, copper, palladium, nickel and silver, and combinations thereof; and at least one multidentate chelating, binucleating ligand. The catalysts may further comprise additional metal ions. The process is particularly suited, for example, to the one-step conversion of benzene to phenol and of benzene to aniline.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: November 9, 1999
    Assignee: Sunoco, Inc. (R&M)
    Inventors: Vincent A. Durante, Tilak P. Wijesekera, Swati Karmakar
  • Leached alumina vanadyl catalysts for hydroxylation of aromatics using molecular oxygen as the terminal oxidant without coreductant
    Patent number: 5962752
    Abstract: A process is disclosed for the catalytic hydroxylation of aromatic hydrocarbons which comprises contacting aromatic feedstock with oxidant comprising molecular oxygen, under suitable reaction conditions, in the presence of a catalyst comprising vanadyl (V.sup.IV) on an alumina support, preferably on leached alumina. The process is particularly suited, for example, to the one-step conversion of benzene to phenol.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: October 5, 1999
    Assignee: Sun Company, Inc.
    Inventors: Vincent A. Durante, Tilak P. Wijesekera, Swati Karmakar
  • Hydroxylation of aromatics using molecular oxygen as the terminal oxidant without coreductant
    Patent number: 5952532
    Abstract: A process is disclosed for the catalytic hydroxylation of aromatic hydrocarbons which comprises contacting aromatic feedstock with oxidant comprising molecular oxygen, under suitable reaction conditions, in the presence of a catalyst comprising three essential components: a support; transition metal selected from the group consisting of vanadium, niobium, copper, palladium, nickel and silver, or combinations thereof, and a promoter comprising a multidentate chelating, binucleating ligand. The catalysts may further comprise additional metal ions. The process is particularly suited, for example, to the one-step conversion of benzene to phenol.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: September 14, 1999
    Assignee: Sunoco, Inc.
    Inventors: Vincent A. Durante, Tilak P. Wijesekera, Swati Karmakar
  • Oxidative ammination of benzene to aniline using molecular oxygen as the terminal oxidant
    Patent number: 5861536
    Abstract: The present invention comprises a process for catalytic oxidative ammination of aromatic hydrocarbons which comprising contacting aromatic feedstock with oxidant, such as molecular oxygen, under suitable reaction conditions, in the presence of a catalyst comprising three essential components: a support; transition metal; and a mono- or binucleating ligand. In one embodiment of the invention the ligand comprises at least one nitro or nitroso group. In another embodiment, the ligand comprises a multidentate, chelating binuclear compound. The process is particularly suited, for example, to the one-step conversion of benzene to aniline.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: January 19, 1999
    Assignee: Sun Company, Inc. (R&M)
    Inventors: Vincent A. Durante, Tilak P. Wijesekera, Swati Karmakar
  • Conversion of alkanes to unsaturated carboxylic acids
    Patent number: 5705685
    Abstract: Alkanes are converted to unsaturated carboxylic acids by contacting an alkane with an oxidizing agent and a heteropolyacid or polyoxoanion comprising (1) at least 9 atoms of a first framework metal or metals comprising molybdenum, tungsten or vanadium or combinations thereof and (2) 1 to 3 atoms of a second framework metal or metals comprising zinc or a transition metal different from the first framework metal.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: January 6, 1998
    Assignee: Sun Company, Inc. (R&M)
    Inventors: James E. Lyons, Paul E. Ellis, Jr., Swati Karmakar, Shahid N. Shaikh