Patents by Inventor Sumit CHAKRABORTY

Sumit CHAKRABORTY 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).

  • Publication number: 20190039978
    Abstract: A transfer hydrogenation process for forming vicinal diols by hydrogenating 1,2-dioxygenated organic compounds using alcohols as the reducing agent instead of the traditional H2 gas. The transfer hydrogenation is carried out under milder conditions of temperature and pressure than is typical for ester hydrogenation with H2. The milder conditions of operation provide benefits, such as lower operating and capital costs for industrial scale production as well as savings in product purification due to the avoidance of by-products from exposure of reaction mixtures and products to high temperatures.
    Type: Application
    Filed: July 24, 2018
    Publication date: February 7, 2019
    Applicant: Eastman Chemical Company
    Inventors: Sumit Chakraborty, Robert Thomas Hembre
  • Publication number: 20190039990
    Abstract: Iron-based homogeneous catalysts, supported by pincer ligands, are employed in the catalytic dehydrocoupling of methanol to produce methyl formate and hydrogen. As both methanol and methyl formate are volatile materials, they can be readily separated from the catalyst by applying vacuum at room temperature. The hydrogen by-product of the reaction may be isolated and utilized as a feedstock in other chemical transformations.
    Type: Application
    Filed: July 24, 2018
    Publication date: February 7, 2019
    Applicant: Eastman Chemical Company
    Inventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki
  • Publication number: 20190039985
    Abstract: Disclosed is a process for recovering formic acid from a formate ester that allows for recovery of a formic acid product comprising greater than 75 wt. % formic acid. Disclosed is also a process for producing formic acid by carbonylating a carrier alcohol, hydrolyzing the formate ester of the carrier alcohol, and recovering a formic acid product comprising greater than 70 wt. % formic acid. Discloses are carrier alcohols that enable more favorable hydrolysis equilibriums and/or distillation sequences.
    Type: Application
    Filed: July 24, 2018
    Publication date: February 7, 2019
    Applicant: Eastman Chemical Company
    Inventors: Scott Donald Barnicki, Robert Thomas Hembre, Sumit Chakraborty, Vickie Haygood Osborne, Michael Richard Laningham, Stijn Van de Vyver
  • Publication number: 20190039991
    Abstract: Iron-based homogeneous catalysts, supported by pincer ligands, are employed in the catalytic dehydrocoupling of ethanol to produce ethyl acetate and hydrogen. As both ethanol and ethyl acetate are volatile materials, they can be readily separated from the catalyst by applying vacuum at room temperature. The hydrogen by-product of the reaction may be isolated and utilized as a feedstock in other chemical transformations.
    Type: Application
    Filed: July 24, 2018
    Publication date: February 7, 2019
    Applicant: Eastman Chemical Company
    Inventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki
  • Publication number: 20190039992
    Abstract: A process for preparing a variety of secondary and tertiary alkyl formate esters via the coupling of methanol and secondary (or tertiary) alcohols. Iron-based catalysts, supported by pincer ligands, are employed to produce these formate esters in high yields and unprecedentedly high selectivities (>99%). Remarkably, the coupling strategy is also applicable to bulkier tertiary alcohols, which afford corresponding tertiary formate esters in moderately high yields and high selectivities.
    Type: Application
    Filed: July 24, 2018
    Publication date: February 7, 2019
    Applicant: Eastman Chemical Company
    Inventors: Sumit Chakraborty, Steven J. Adams, Robert Thomas Hembre, Scott Donald Barnicki, Michael Richard Laningham, Gerarld Wayne Ollis, Randy Lynn Jennings
  • Publication number: 20180273382
    Abstract: The present invention relates to a method for the manufacture of cyclododecasulfur, a cyclic sulfur allotrope wherein the number of sulfur (S) atoms in the allotrope's homocyclic ring is 12. The method includes reacting a metallasulfur derivative with an oxidizing agent in a reaction zone to form a cyclododecasulfur-containing reaction mixture.
    Type: Application
    Filed: June 1, 2018
    Publication date: September 27, 2018
    Applicant: EASTMAN CHEMICAL COMPANY
    Inventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, ELAINE BEATRIC MACKENZIE, JOY LYNN LANINGHAM, MICHAEL RICHARD LANINGHAM, SHANE KIPLEY KIRK, LARRY WAYNE BLAIR, SUMIT CHAKRABORTY, VENKATESWARLU BHAMIDI, GUOXIONG HUA, JOHN DEREK WOOLLINS
  • Patent number: 10011485
    Abstract: The present invention relates to a method for the manufacture of cyclododecasulfur, a cyclic sulfur allotrope wherein the number of sulfur (S) atoms in the allotrope's homocyclic ring is 12. The method includes reacting a metallasulfur derivative with an oxidizing agent in a reaction zone to form a cyclododecasulfur-containing reaction mixture.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: July 3, 2018
    Assignee: EASTMAN CHEMICAL COMPANY
    Inventors: Scott Donald Barnicki, Robert Thomas Hembre, Elaine Beatrice MacKenzie, Joy Lynn Laningham, Michael Richard Laningham, Shane Kipley Kirk, Larry Wayne Blair, Sumit Chakraborty, Venkateswarlu Bhamidi, Guoxiong Hua, John Derek Woollins
  • Patent number: 10000380
    Abstract: The present invention relates to a method for the manufacture of polymeric sulfur. The method includes reacting a metallasulfur derivative with an oxidizing agent to form polymeric sulfur.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: June 19, 2018
    Assignee: EASTMAN CHEMICAL COMPANY
    Inventors: Scott Donald Barnicki, Robert Thomas Hembre, Michael Richard Laningham, Sumit Chakraborty, Venkateswarlu Bhamidi
  • Patent number: 9902673
    Abstract: Methods and compositions for producing 1-butanol are described herein. In some examples, the methods can comprise, contacting a reactant comprising ethanol with a catalyst system, thereby producing a product comprising 1-butanol. The catalyst system can comprise, for example, an iridium catalyst and a nickel, copper, and/or zinc catalyst. The nickel, copper, and zinc catalysts can comprise nickel, copper, and/or zinc and a sterically bulky ligand.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: February 27, 2018
    Assignee: The University of Rochester
    Inventors: William D. Jones, Sumit Chakraborty
  • Publication number: 20170253484
    Abstract: The present invention relates to a method for the manufacture of cyclododecasulfur, a cyclic sulfur allotrope wherein the number of sulfur (S) atoms in the allotrope's homocyclic ring is 12. The method includes reacting a metallasulfur derivative with an oxidizing agent in a reaction zone to form a cyclododecasulfur-containing reaction mixture.
    Type: Application
    Filed: February 23, 2017
    Publication date: September 7, 2017
    Applicant: EASTMAN CHEMICAL COMPANY
    Inventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, ELAINE BEATRICE MACKENZIE, JOY LYNN LANINGHAM, MICHAEL RICHARD LANINGHAM, SHANE KIPLEY KIRK, LARRY WAYNE BLAIR, SUMIT CHAKRABORTY, VENKATESWARLU BHAMIDI, GUOXIONG HUA, JOHN DEREK WOOLLINS
  • Publication number: 20170253483
    Abstract: The present invention relates to a method for the manufacture of polymeric sulfur. The method includes reacting a metallasulfur derivative with an oxidizing agent to form polymeric sulfur.
    Type: Application
    Filed: February 23, 2017
    Publication date: September 7, 2017
    Applicant: EASTMAN CHEMICAL COMPANY
    Inventors: SCOTT DONALD BARNICKI, ROBERT THOMAS HEMBRE, MICHAEL RICHARD LANINGHAM, SUMIT CHAKRABORTY, VENKATESWARLU BHAMIDI
  • Publication number: 20170015610
    Abstract: Methods and compositions for producing 1-butanol are described herein. In some examples, the methods can comprise, contacting a reactant comprising ethanol with a catalyst system, thereby producing a product comprising 1-butanol. The catalyst system can comprise, for example, an iridium catalyst and a nickel, copper, and/or zinc catalyst. The nickel, copper, and zinc catalysts can comprise nickel, copper, and/or zinc and a sterically bulky ligand.
    Type: Application
    Filed: July 15, 2016
    Publication date: January 19, 2017
    Applicant: University of Rochester
    Inventors: William D. Jones, Sumit Chakraborty
  • Publication number: 20160089028
    Abstract: System, controller, and computer readable medium for controlling a presentation of audio and video information to a user. Physiological parameters of the user can be monitored in real time to determine changes in activity. A video presentation and/or an audio presentation can be modified based on the determined change in activity. Additionally, a user interface can be modified based on the determined change in activity.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 31, 2016
    Inventors: Dibyendu CHATTERJEE, Sowrabha Mysore INDUKUMAR, Sumit CHAKRABORTY
  • Publication number: 20150274621
    Abstract: The homogeneous hydrogenation of organic carbonyls, especially esters, under relatively mild conditions using iron hydrido-borohydride catalyst complexes having amino-phosphine pincer ligands. The catalyst and process are well-suited for catalyzing the hydrogenation of a wide variety of organic carbonyls, such as hydrogenation of fatty acid esters to alcohols. In particular embodiments, the process can be carried out in the absence of solvent.
    Type: Application
    Filed: March 23, 2015
    Publication date: October 1, 2015
    Inventors: Neil Thomas FAIRWEATHER, Michael Steven GIBSON, Hairong GUAN, Sumit CHAKRABORTY, Huiguang DAI, Papri BHATTACHARYA