Patents by Inventor Sourav Kumar Sengupta

Sourav Kumar 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: 11834389
    Abstract: A method of making N-(2,4-dinitrophenyl)-4-nitrobenzamide from a mixture of 2,4-dinitroaniline, 4-nitrobenzoyl chloride, and solid acid catalyst in an organic solvent, wherein the solid acid catalyst is not soluble in the organic solvent, the solid acid catalyst being an acidic clay, an ion exchange resin, a beta zeolite, a sulfonated tetrafluoroethylene-based fluoropolymer-copolymer, or some mixture of these.
    Type: Grant
    Filed: May 18, 2021
    Date of Patent: December 5, 2023
    Assignee: DUPONT SAFETY & CONSTRUCTION, INC.
    Inventors: James A. Schultz, Sourav Kumar Sengupta, Venkateswara Rao Surisetty
  • Publication number: 20230278941
    Abstract: A method for reduction of sugars. The first step is providing a solution of a sugar comprising from five to twenty carbon atoms. The second step is contacting said solution with hydrogen gas and a catalyst. The catalyst is an ion exchange resin comprising Ru.
    Type: Application
    Filed: July 21, 2021
    Publication date: September 7, 2023
    Inventors: Jose Antonio Trejo, Sourav Kumar Sengupta, Jonathan M. Bingaman
  • Publication number: 20210387942
    Abstract: A method of making N-(2,4-dinitrophenyl)-4-nitrobenzamide from a mixture of 2,4-dinitroaniline, 4-nitrobenzoyl chloride, and solid acid catalyst in an organic solvent, wherein the solid acid catalyst is not soluble in the organic solvent, the solid acid catalyst being an acidic clay, an ion exchange resin, a beta zeolite, a sulfonated tetrafluoroethylene-based fluoropolymer-copolymer, or some mixture of these.
    Type: Application
    Filed: May 18, 2021
    Publication date: December 16, 2021
    Inventors: James A. Schultz, SOURAV KUMAR SENGUPTA, VENKATESWARA RAO SURISETTY
  • Publication number: 20190031634
    Abstract: Disclosed are processes for producing the dialkyl ester of 2,5-furan dicarboxylic acid by contacting a feed containing 2,5-furan dicarboxylic acid and a high boiling solvent with an alcohol in the presence of a solid acid catalyst using reactive distillation.
    Type: Application
    Filed: October 2, 2018
    Publication date: January 31, 2019
    Inventors: Pranit S. Metkar, Sourav Kumar Sengupta
  • Publication number: 20180155307
    Abstract: A process for efficiently esterifying furan dicarboxylic acid, especially 2,5-furan dicarboxylic acid in the presence of an alcohol and, optionally, a catalyst is disclosed. The process provides high yields of the diesters of furan dicarboxylic acid and comprises a multi-stage esterification process wherein a portion of a gas phase is removed at each stage of the multi-stage process.
    Type: Application
    Filed: July 21, 2016
    Publication date: June 7, 2018
    Inventors: Pranit S. Metkar, Sourav Kumar Sengupta
  • Patent number: 9670118
    Abstract: Disclosed herein are processes for preparing an ?,?-Cn-diol, wherein n is 5 or greater, from a feedstock comprising a Cn oxygenate. In one embodiment, the process comprises contacting the feedstock with hydrogen gas in the presence of a catalyst comprising Pt, Cu, Ni, Pd, Pt, Rh, Ir, Ru, or Fe on a WO3 or WOx support. In one embodiment, the process comprises contacting the feedstock with hydrogen in the presence of a catalyst comprising a metal M1 and a metal M2 or an oxide of M2, and optionally a support. In one embodiment, M1 is Pd, Pt, or Ir; and M2 is Mo, W, V, Mn, Re, Zr, Ni, Cu, Zn, Cr, Ge, Sn, Ti, Au, or Co. The Cn oxygenate may be obtained from a biorenewable resource.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: June 6, 2017
    Assignee: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Alan Martin Allgeier, Torren Ryan Carlson, David Richard Corbin, Wathudura Indika Namal De Silva, Carl Andrew Menning, Joachim C Ritter, Sourav Kumar Sengupta
  • Publication number: 20160159715
    Abstract: Disclosed herein are processes for producing 1,6-hexanediol. In one embodiment, the process comprises a step of contacting 3,4-dihydro-2H-pyran-2-carbaldehyde, a solvent, and hydrogen in the presence of a catalyst at a reaction temperature between about 0° C. and about 120° C. at a pressure and for a reaction time sufficient to form a product mixture comprising 1,6-hexanediol. In one embodiment, the catalyst comprises a metal M1, a metal M2 or an oxide of M2, and a support, wherein M1 is Rh, Ir, Ni, Pd, or Pt, and M2 is Mo, W, or Re; or M1 is Cu and M2 is Ni, Mn, or W.
    Type: Application
    Filed: December 2, 2015
    Publication date: June 9, 2016
    Inventors: RONALD JAMES DAVIS, CARL ANDREW MENNING, JOSEPH E. MURPHY, JOACHIM C. RITTER, SOURAV KUMAR SENGUPTA
  • Publication number: 20160046541
    Abstract: A hydrodeoxygenation process for producing a linear alkane from a feedstock comprising a saturated or unsaturated C10-18 oxygenate that comprises an ester group, carboxylic acid group, carbonyl group and/or alcohol group is disclosed. The process comprises contacting the feedstock with a catalyst composition comprising a metal catalyst and a heteropolyacid or heteropolyacid salt, at a temperature between about 240° C. to 280° C. and a hydrogen gas pressure of at least 300 psi. The metal catalyst comprises copper in certain embodiments. By contacting the feedstock with the catalyst composition under these temperature and pressure conditions, the C10-18 oxygenate is hydrodeoxygenated to a linear alkane that has the same carbon chain length as the C10-18 oxygenate.
    Type: Application
    Filed: March 12, 2014
    Publication date: February 18, 2016
    Inventors: Manish S. Kelkar, Joseph E. Murphy, Joachim C. Ritter, Sourav Kumar Sengupta
  • Publication number: 20160023975
    Abstract: Disclosed herein are processes for preparing an ?,?-Cn-diol, wherein n is 5 or greater, from a feedstock comprising a Cn oxygenate. In one embodiment, the process comprises contacting the feedstock with hydrogen gas in the presence of a catalyst comprising Pt, Cu, Ni, Pd, Pt, Rh, Ir, Ru, or Fe on a WO3 or WOx support. In one embodiment, the process comprises contacting the feedstock with hydrogen in the presence of a catalyst comprising a metal M1 and a metal M2 or an oxide of M2, and optionally a support. In one embodiment, M1 is Pd, Pt, or Ir; and M2 is Mo, W, V, Mn, Re, Zr, Ni, Cu, Zn, Cr, Ge, Sn, Ti, Au, or Co. The Cn oxygenate may be obtained from a biorenewable resource.
    Type: Application
    Filed: October 7, 2015
    Publication date: January 28, 2016
    Inventors: Alan Martin Allgeier, TORREN RYAN CARLSON, DAVID RICHARD CORBIN, WATHUDURA INDIKA NAMAL DE SILVA, CARL ANDREW MENNING, JOACHIM C RITTER, SOURAV KUMAR SENGUPTA
  • Publication number: 20160009610
    Abstract: A hydrodeoxygenation process for producing a linear alkane from a feedstock comprising a saturated or unsaturated C10-18 oxygenate that comprises an ester group, carboxylic acid group, carbonyl group and/or alcohol group is disclosed. This process comprises contacting the feedstock with (i) a catalyst comprising about 0.1% to about 10% by weight of a metal selected from Group IB, VIB, or VIII of the Periodic Table, and (ii) a heteropolyacid or heteropolyacid salt, at a temperature between about 150° C. to about 250° C. and a hydrogen gas pressure of at least about 300 psig. By contacting the feedstock with the catalyst and heteropolyacid or heteropolyacid salt under these temperature and pressure conditions, the C10-18 oxygenate is hydrodeoxygenated to a linear alkane that has the same carbon chain length as the C10-18 oxygenate.
    Type: Application
    Filed: March 12, 2014
    Publication date: January 14, 2016
    Inventors: Annalisa Hargis, Manish S. Kelkar, Kenneth Chad Manning, Joachim C. Ritter, Sourav Kumar Sengupta
  • Patent number: 9181157
    Abstract: Disclosed herein are processes for preparing an ?,?-Cn-diol, wherein n is 5 or greater, from a feedstock comprising a Cn oxygenate. In one embodiment, the process comprises contacting the feedstock with hydrogen gas in the presence of a catalyst comprising Pt, Cu, Ni, Pd, Pt, Rh, Ir, Ru, or Fe on a WO3 or WOx support. In one embodiment, the process comprises contacting the feedstock with hydrogen in the presence of a catalyst comprising a metal M1 and a metal M2 or an oxide of M2, and optionally a support. In one embodiment, M1 is Pd, Pt, or Ir; and M2 is Mo, W, V, Mn, Re, Zr, Ni, Cu, Zn, Cr, Ge, Sn, Ti, Au, or Co. The Cn oxygenate may be obtained from a biorenewable resource.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: November 10, 2015
    Assignee: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Alan Martin Allgeier, Torren Ryan Carlson, David Richard Corbin, Wathudura Indika Namal De Silva, Ekaterini Korovessi, Carl Andrew Menning, Joachim C Ritter, Sourav Kumar Sengupta
  • Publication number: 20150152074
    Abstract: Furfural is produced by contacting a feedstock solution containing C5 sugar and/or C6 sugar with a solid acid catalyst using reactive distillation. Both high yield and high conversion are obtained, without production of insoluble char in the reaction vessel. Degradation of furfural is minimized by its low residence time in contact with the solid acid catalyst. Higher catalyst lifetime can be achieved because the catalyst is continually washed with the refluxing aqueous solution and not sitting in high-boiling byproducts like humins, which are known to be deleterious to catalyst lifetime.
    Type: Application
    Filed: February 11, 2015
    Publication date: June 4, 2015
    Inventors: DAVID RICHARD CORBIN, PAUL JOSEPH FAGAN, STUART B. FERGUSSON, KEITH W. HUTCHENSON, PRANIT S. METKAR, RONNIE OZER, CARMO JOSEPH PEREIRA, BHUMA RAJAGOPALAN, SOURAV KUMAR SENGUPTA, ERIC J. TILL
  • Patent number: 9018423
    Abstract: Disclosed herein are processes for preparing an ?,?-Cn-diol, wherein n is 5 or greater, from a feedstock comprising a Cn oxygenate. In one embodiment, the process comprises contacting the feedstock with hydrogen gas in the presence of a catalyst comprising Pt, Cu, Ni, Pd, Pt, Rh, Ir, Ru, or Fe on a WO3 or WOx support. In one embodiment, the process comprises contacting the feedstock with hydrogen in the presence of a catalyst comprising a metal M1 and a metal M2 or an oxide of M2, and optionally a support. In one embodiment, M1 is Pd, Pt, or Ir; and M2 is Mo, W, V, Mn, Re, Zr, Ni, Cu, Zn, Cr, Ge, Sn, Ti, Au, or Co. The Cn oxygenate may be obtained from a biorenewable resource.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: April 28, 2015
    Assignee: E I du Pont de Nemours and Company
    Inventors: Alan Martin Allgeier, Torren Ryan Carlson, David Richard Corbin, Wathudura Indika Namal De Silva, Ekaterini Korovessi, Carl Andrew Menning, Joachim C Ritter, H David Rosenfeld, Sourav Kumar Sengupta
  • Patent number: 9012664
    Abstract: Furfural is produced by contacting a feedstock solution containing C5 sugar and/or C6 sugar with a solid acid catalyst using reactive distillation. Both high yield and high conversion are obtained, without production of insoluble char in the reaction vessel. Degradation of furfural is minimized by its low residence time in contact with the solid acid catalyst. Higher catalyst lifetime can be achieved because the catalyst is continually washed with the refluxing aqueous solution and not sitting in high-boiling byproducts like humins, which are known to be deleterious to catalyst lifetime.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: April 21, 2015
    Assignee: E I du Pont de Nemours and Company
    Inventors: David Richard Corbin, Paul Joseph Fagan, Stuart B Fergusson, Keith W Hutchenson, Pranit S Metkar, Ronnie Ozer, Carmo Joseph Pereira, Bhuma Rajagopalan, Sourav Kumar Sengupta, Eric J. Till
  • Publication number: 20150099903
    Abstract: Disclosed herein are processes for preparing an ?,?-Cn-diol, wherein n is 5 or greater, from a feedstock comprising a Cn oxygenate. In one embodiment, the process comprises contacting the feedstock with hydrogen gas in the presence of a catalyst comprising Pt, Cu, Ni, Pd, Pt, Rh, Ir, Ru, or Fe on a WO3 or WOx support. In one embodiment, the process comprises contacting the feedstock with hydrogen in the presence of a catalyst comprising a metal M1 and a metal M2 or an oxide of M2, and optionally a support. In one embodiment, M1 is Pd, Pt, or Ir; and M2 is Mo, W, V, Mn, Re, Zr, Ni, Cu, Zn, Cr, Ge, Sn, Ti, Au, or Co. The Cn oxygenate may be obtained from a biorenewable resource.
    Type: Application
    Filed: December 12, 2014
    Publication date: April 9, 2015
    Inventors: ALAN MARTIN ALLGEIER, Torren Ryan Carlson, David Richard Corbin, Wathudura Indika Namal De Silva, Ekaterini Korovessi, Carl Andrew Menning, Joachim C. Ritter, Sourav Kumar Sengupta
  • Patent number: 8981130
    Abstract: Disclosed are processes for preparing 1,2-cyclohexanediol, and mixtures of 1,2-cyclohexanediol and 1,6-hexanediol, by hydrogenating 1,2,6-hexanetriol.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: March 17, 2015
    Assignee: E I Du Pont de Nemours and Company
    Inventors: Wathudura Indika Namal de Silva, Ekaterini Korovessi, Carl Andrew Menning, Joseph E Murphy, Joachim C Ritter, Sourav Kumar Sengupta
  • Patent number: 8962894
    Abstract: Disclosed are processes for preparing 1,6-hexanediol and synthetic intermediates useful in the production of 1,6-hexanediol from renewable biosources. In one embodiment, a process comprises contacting levoglucosenone with hydrogen in the presence of a first hydrogenation catalyst at a first temperature to form product mixture (I); and heating product mixture (I) in the presence of hydrogen and a second hydrogenation catalyst at a second temperature to form product mixture (II) which comprises 1,6-hexanediol.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: February 24, 2015
    Assignee: E I du Pont de Nemours and Company
    Inventors: Alan Martin Allgeier, Wathudura Indika Namal De Silva, Ekaterini Korovessi, Carl Andrew Menning, Joachim C Ritter, Sourav Kumar Sengupta, Christina S Stauffer
  • Patent number: 8889912
    Abstract: Disclosed are processes for preparing 1,6-hexanediol from levoglucosenone. In one embodiment, the process comprises contacting levoglucosenone with hydrogen in the presence of a hydrogenation catalyst comprising palladium, platinum/tungsten, nickel/tungsten, rhodium/rhenium, or mixtures thereof at a first temperature between about 50° C. and 100° C. and at a first reaction pressure between about 50 psi and 2000 psi for a first reaction period, and at a second temperature between about 120° C. and 250° C. and at a second pressure between about 500 psi and 2000 psi for a second reaction period to form a product mixture comprising 1,6-hexanediol, wherein the first reaction period is the amount of time in which the levoglucosenone has a conversion of at least about 95%. In one embodiment, the 1,6-hexanediol is converted to 1,6-diaminohexane.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: November 18, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Alan Martin Allgeier, David Richard Corbin, Wathudura Indika Namal De Silva, Ekaterini Korovessi, Carl Andrew Menning, Joachim C Ritter, Sourav Kumar Sengupta
  • Patent number: 8889922
    Abstract: Disclosed are processes for preparing 1,6-hexanediol from levoglucosenone. In one embodiment, the process comprises contacting levoglucosenone with hydrogen in the presence of a hydrogenation catalyst comprising palladium, platinum/tungsten, nickel/tungsten, rhodium/rhenium, or mixtures thereof at a first temperature between about 50° C. and 100° C. and at a first reaction pressure between about 50 psi and 2000 psi for a first reaction period, and at a second temperature between about 120° C. and 250° C. and at a second pressure between about 500 psi and 2000 psi for a second reaction period to form a product mixture comprising 1,6-hexanediol, wherein the first reaction period is the amount of time in which the levoglucosenone has a conversion of at least about 95%.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: November 18, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Alan Martin Allgeier, David Richard Corbin, Wathudura Indika Namal De Silva, Ekaterini Korovessi, Carl Andrew Menning, Joachim C Ritter, Sourav Kumar Sengupta
  • Patent number: 8884035
    Abstract: Disclosed herein are processes comprising contacting isosorbide with hydrogen in the presence of a first hydrogenation catalyst to form a first product mixture comprising tetrahydrofuran-2,5-dimethanol. The processes can further comprise heating the first product mixture in the presence of hydrogen and a second hydrogenation catalyst to form a second product mixture comprising 1,6-hexanediol. The first and second hydrogenation catalysts can be the same or different.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: November 11, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Wathudura Indika Namal de Silva, Ekaterini Korovessi, Carl Andrew Menning, Joseph E Murphy, Joachim C Ritter, Sourav Kumar Sengupta, Christina S Stauffer