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).
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Patent number: 8119847Abstract: 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: GrantFiled: June 13, 2008Date of Patent: February 21, 2012Assignee: E. I. du Pont de Nemours and CompanyInventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon
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Patent number: 8084655Abstract: 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: GrantFiled: June 13, 2008Date of Patent: December 27, 2011Assignee: E. I. du Pont de Nemours and CompanyInventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon, David Richard Corbin
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Publication number: 20100280280Abstract: 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: ApplicationFiled: April 30, 2009Publication date: November 4, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Sheng Peng, Sourav K. Sengupta
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Patent number: 7524995Abstract: 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: GrantFiled: June 12, 2008Date of Patent: April 28, 2009Assignee: E.I. du Pont de Nemours and CompanyInventors: Stephen M. Tieri, John Joseph Hagedom, James Arnold Schultz, Tiberiu M. Leib, Susanne Hawthorne Wolff, Sourav K. Sengupta, Gregory Paul Shankwitz
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Publication number: 20080308458Abstract: 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: ApplicationFiled: June 13, 2008Publication date: December 18, 2008Applicant: E. I. du Pont de Nemours and CompanyInventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon, David Richard Corbin
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Publication number: 20080312480Abstract: 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: ApplicationFiled: June 13, 2008Publication date: December 18, 2008Applicant: E. I. du Pont de Nemours and CompanyInventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon
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Publication number: 20080308457Abstract: 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: ApplicationFiled: June 13, 2008Publication date: December 18, 2008Applicant: E. I. du Pont de Nemours and CompanyInventors: Hasan Dindi, Sourav K. Sengupta, Andrew Francis Gonzon
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Patent number: 7390897Abstract: 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: GrantFiled: February 10, 2006Date of Patent: June 24, 2008Assignee: Invista North America S.A.R.L.Inventors: Alan M. Allgeier, John J. Ostermaier, Sourav K. Sengupta
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Patent number: 7060820Abstract: 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: GrantFiled: March 18, 2005Date of Patent: June 13, 2006Assignee: Invista North America S.A.R.L.Inventors: Sourav K. Sengupta, John J. Ostermaier, Gregory S. Kirby
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Publication number: 20030175196Abstract: 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: ApplicationFiled: March 14, 2002Publication date: September 18, 2003Inventors: Benny E. Blackwell, Cynthia K. Fallon, Gregory S. Kirby, Mehrdad Mehdizadeh, Theodore Augur Koch, Carmo Joseph Pereira, Sourav K. Sengupta
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Patent number: 6376714Abstract: 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: GrantFiled: May 31, 2001Date of Patent: April 23, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Alan M. Allgeier, Theodore A. Koch, Sourav K. Sengupta
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Patent number: 6372939Abstract: 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: GrantFiled: November 16, 2000Date of Patent: April 16, 2002Assignee: E.I. du Pont de Nemours and CompanyInventors: Emilio E. Bunel, Theodore A. Koch, Ronnie Ozer, Sourav K. Sengupta
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Patent number: 6365770Abstract: 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: GrantFiled: November 16, 2000Date of Patent: April 2, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Emilio E. Bunel, Theodore A. Koch, Ronnie Ozer, Sourav K. Sengupta
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Patent number: 5085885Abstract: 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: GrantFiled: September 10, 1990Date of Patent: February 4, 1992Assignee: University of DelawareInventors: Henry C. Foley, Robert D. Varrin, Jr., Sourav K. Sengupta