Patents by Inventor Sourav Kumar

Sourav Kumar 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).

  • Gas phase catalyzed reactions
    Patent number: 6315972
    Abstract: This invention relates to improvements in processes and catalysts for elevated temperature, gas phase, catalyzed reactions in general; it is particularly illustrated by reference to the manufacture of hydrogen cyanide.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: November 13, 2001
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Mehrdad Mehdizadeh, Theodore A. Koch, Karl Robert Krause, Sourav Kumar Sengupta, Benny Earl Blackwell
  • Process for the production of 6-aminocapronitrile and/or hexamethylenediamine
    Patent number: 5986126
    Abstract: Process for producing 6-aminocapronitrile and/or hexamethylenediamine by hydroformylating 3-pentenenitrile, isolating a formylvaleronitrile (FVN) mixture from the hydroformylation reaction product, reductively aminating the FVN mixture and isolating the desired product.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: November 16, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Emilio Enrique Bunel, Theodore Augur Koch, Ronnie Ozer, Shawn Homer Phillips, Sourav Kumar Sengupta
  • Induction heated reactor apparatus
    Patent number: 5958273
    Abstract: An improved induction heated reactor apparatus involving a reaction zone with inlet and outlet and containing an array of electrically conductive catalyst entities (susceptor entities) comprising pellets, rings, or rods containing a core externally coated with a substantially uniform and complete catalyst metal (e.g., platinum, platinum-iridium alloy, or platinum-rhodium alloy) wrap, coating, or surface impregnated, or containing the catalyst metal as a foam which are inductively heated to produce chemical product from a catalytic reaction. Such an apparatus is particularly useful in the catalytic generation of HCN at elevated temperatures.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: September 28, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Theodore A. Koch, Karl Robert Krause, Mehrdad Mehdizadeh, Sourav Kumar Sengupta, Benny Earl Blackwell
  • Process for continuous hydrogenation of adiponitrile
    Patent number: 5900511
    Abstract: A process for continuous hydrogenation of adiponitrile (ADN) to hexamethylene diamine (HMD) and optionally to amninocapronitrile (ACN) involving the catalytic hydrogenation of adiponitrile at relatively low temperature (e.g., 75.degree. C.) and pressure (e.g., 500 psig) using a sponge cobalt catalyst (Raney.RTM. Co) in a reaction medium that is substantially free of caustic. In such a process periodic addition of water controls the production of side reaction products and the periodic addition of ammonium hydroxide rejuvenates the catalyst. Hexamethylene diamine is an important intermediate for the synthesis of polyamides such as Nylon-6,6 and aminocapronitrile is a potential intermediate of Nylon-6.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: May 4, 1999
    Assignee: E. I. de Pont de Nemours and Company
    Inventors: Sourav Kumar Sengupta, Theodore Augur Koch, Karl Robert Krause
  • Process for preparing 5-chloro-2,3-dihydro-1H-inden-1-one
    Patent number: 5811585
    Abstract: A process for preparing 5-chloro-2,3-dihydro-1H-inden-1-one comprising contacting 3-chloro-1-(chlorphenyl)-1-propanone with a catalyst selected from sulfuric acid and solid acid catalysts.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: September 22, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Donald Joseph Dumas, Sourav Kumar Sengupta, David Richard Corbin