Patents by Inventor Sourav K. Sengupta

Sourav K. Sengupta 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).

  • Patent number: 8119847
    Abstract: A process for converting renewable resources such as vegetable oil and animal fat into paraffins in a single step which comprises contacting a feed which is a renewable resources with hydrogen and a catalyst which comprises a non-precious metal and an oxide to produce a hydrocarbon product having a ratio of odd-numbered hydrocarbons to even-numbered hydrocarbons of at least 2:1.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: February 21, 2012
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon
  • Patent number: 8084655
    Abstract: A process for converting renewable resources such as vegetable oil and animal fat into paraffins in a single step which comprises contacting a feed which is a renewable resources with hydrogen and a catalyst which comprises a non-precious metal a first oxide and optionally a second oxide wherein at least one of the first oxide or second oxide comprises a zeolite, through hydrodeoxygenation and one or both of hydroisomerization and hydrocracking.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: December 27, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon, David Richard Corbin
  • Publication number: 20100280280
    Abstract: A fluorinated alkylalkoxylate, and a process for its preparation in which at least one fluorinated alcohol is contacted with at least one alkylene epoxide in the presence of a catalyst system comprising an alkali metal borohydride, and an organic quaternary salt.
    Type: Application
    Filed: April 30, 2009
    Publication date: November 4, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Sheng Peng, Sourav K. Sengupta
  • Patent number: 7524995
    Abstract: A continuous process for producing hexafluoroisopropanol is provided which comprises contacting hexafluoroacetone with hexafluoroisopropanol and hydrogen to produce a liquid feed stream; introducing the liquid feed stream to a reactor containing an immobilized hydrogenation catalyst to convert the hexafluoroacetone to hexafluoroisopropanol and provide a product stream; and recovering at least a portion of the hexafluoroisopropanol from the product stream. Preferably a portion of the product stream is recycled. The reactor can be a packed bed or stirred tank reactor.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: April 28, 2009
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Stephen M. Tieri, John Joseph Hagedom, James Arnold Schultz, Tiberiu M. Leib, Susanne Hawthorne Wolff, Sourav K. Sengupta, Gregory Paul Shankwitz
  • Publication number: 20080312480
    Abstract: A process for converting renewable resources such as vegetable oil and animal fat into paraffins in a single step which comprises contacting a feed which is a renewable resources with hydrogen and a catalyst which comprises molybdenum, a non-precious metal and an oxide to produce a hydrocarbon product having a ratio of even-numbered hydrocarbons to odd-numbered hydrocarbons of at least 2:1.
    Type: Application
    Filed: June 13, 2008
    Publication date: December 18, 2008
    Applicant: E. I. du Pont de Nemours and Company
    Inventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon
  • Publication number: 20080308458
    Abstract: A process for converting renewable resources such as vegetable oil and animal fat into paraffins in a single step which comprises contacting a feed which is a renewable resources with hydrogen and a catalyst which comprises a non-precious metal a first oxide and optionally a second oxide wherein at least one of the first oxide or second oxide comprises a zeolite, through hydrodeoxygenation and one or both of hydroisomerization and hydrocracking.
    Type: Application
    Filed: June 13, 2008
    Publication date: December 18, 2008
    Applicant: E. I. du Pont de Nemours and Company
    Inventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon, David Richard Corbin
  • Publication number: 20080308457
    Abstract: A process for converting renewable resources such as vegetable oil and animal fat into paraffins in a single step which comprises contacting a feed which is a renewable resources with hydrogen and a catalyst which comprises a non-precious metal and an oxide to produce a hydrocarbon product having a ratio of odd-numbered hydrocarbons to even-numbered hydrocarbons of at least 2:1.
    Type: Application
    Filed: June 13, 2008
    Publication date: December 18, 2008
    Applicant: E. I. du Pont de Nemours and Company
    Inventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon
  • Patent number: 7390897
    Abstract: The invention relates to the field of production of lactams from aminonitriles, and in particular to the production of ?-caprolactam by the vapor phase hydrolytic cyclization of 6-aminocapronitrile. A crude liquid caprolactam comprising ?-caprolactam (CL), 6-aminocapronitrile (ACN) and water obtained from a vapor phase cyclization reaction of ACN is contacted with hydrogen in the presence of a hydrogenation catalyst to convert the ACN in the crude liquid caprolactam to a product comprising hexamethylenediamine (HMD) and hexamethyleneimine (HMI). Tetrahydroazepine (THA) in the crude liquid caprolactam is converted to HMI during this hydrogenation. The HMD and HMI have lower boiling points compared to ACN and thus they are more easily separated from CL in the subsequent distillation operations. Thus a process to make CL from ACN with fewer distillation stages, and with lower pressure drop and lower base temperature, is accomplished.
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: June 24, 2008
    Assignee: Invista North America S.A.R.L.
    Inventors: Alan M. Allgeier, John J. Ostermaier, Sourav K. Sengupta
  • Patent number: 7060820
    Abstract: Lactams, in particular ?-caprolactam, are produced by the hydrolytic cyclization of aminonitriles, in particular 6-aminocapronitrile, in the vapor phase in a plurality of adiabatic fixed bed reaction zones arranged in succession wherein at least a portion of the heat of the exothermic reaction is removed between each of the successive reaction zones. Conducting the reaction in such a manner requires less capital for the reactor itself. It has also been found that the product exiting such a reaction system can be directly fed to a distillation unit without the need of additional cooling or storing.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: June 13, 2006
    Assignee: Invista North America S.A.R.L.
    Inventors: Sourav K. Sengupta, John J. Ostermaier, Gregory S. Kirby
  • Publication number: 20030175196
    Abstract: Elevated temperature, gas-phase, catalyzed processes for preparing HCN in which induction heating is used as a source of energy, and novel apparatus for carrying out said processes.
    Type: Application
    Filed: March 14, 2002
    Publication date: September 18, 2003
    Inventors: Benny E. Blackwell, Cynthia K. Fallon, Gregory S. Kirby, Mehrdad Mehdizadeh, Theodore Augur Koch, Carmo Joseph Pereira, Sourav K. Sengupta
  • Patent number: 6376714
    Abstract: Process for converting a dinitrile to a diamine and optionally an aminonitrile, in which a Group VIII element catalyst is treated with a modifier either before or during a substantially solvent-free hydrogenation reaction in which the dinitrile is contacted with hydrogen in the presence of the catalyst.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: April 23, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alan M. Allgeier, Theodore A. Koch, Sourav K. Sengupta
  • Patent number: 6372939
    Abstract: A process for making 6-aminocaproic acid by hydroformylating 3-pentenenitrile to produce 3-, 4-, and 5-formylvaleronitrile (FVN mixture), oxidizing the FVN mixture to produce 3-, 4-, and 5-cyanovaleric acid; hydrogenating the resulting product to produce 6-aminocaproic acid, 5-amino-4-methylvaleric acid, and 4-amino-3-ethylbutyric acid; and isolating 6-aminocaproic acid from the reaction product. The resulting 6-aminocaproic acid can be cyclized to produce caprolactam.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: April 16, 2002
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Emilio E. Bunel, Theodore A. Koch, Ronnie Ozer, Sourav K. Sengupta
  • Patent number: 6365770
    Abstract: A process for making alkyl 6-aminocaproate by hydroformylating 3-pentenenitrile to produce 3-, 4-, and 5-formylvaleronitrile (FVN mixture), converting the FVN mixture to alkyl 3-, 4-, and 5-cyanovalerate by either oxidative esterification of the FVN mixture or oxidation of the FVN mixture followed by esterification; isolating alkyl 5-cyanovalerate; and hydrogenating the alkyl 5-cyanovalerate to produce alkyl 6-aminocaproate. The resulting alkyl 6-aminocaproate can be cyclized to produce caprolactam.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: April 2, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Emilio E. Bunel, Theodore A. Koch, Ronnie Ozer, Sourav K. Sengupta
  • Patent number: 5085885
    Abstract: A beam or flow of a reactive or metastable precursor such as a hydride or organometallic compound is created, and this beam or flow is used to treat (e.g. dope or coat or otherwise modify) a substrate, e.g. an advanced material such as a semiconductor layer, a photovoltaic cell, or a solar cell. The beam or flow can also be directed into a storage zone so that the precursor or precursors can be collected for future use. The beam or flow is created in an apparatus comprising at least three zones. Zone 1 is irradiated with microwave energy to generate a reactive gas rich in free radicals (e.g. rich in H.sup.., CH.sub.3.sup.., etc.) zone 2 (downstream from zone 1) is substantially free of microwave energy and contains a target which is impinged upon by the free radicals and becomes a source of the precursor; zone 3 (downstream from zone 2) is where the precursors are either collected for storage or are used to treat the substrate. In a typical apparatus of this invention, a feed gas such as H.sub.2 or CH.sub.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: February 4, 1992
    Assignee: University of Delaware
    Inventors: Henry C. Foley, Robert D. Varrin, Jr., Sourav K. Sengupta