Patents by Inventor Pramod Kumbhar

Pramod Kumbhar 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: 7148386
    Abstract: A process for the preparation of hydroquinone compounds comprising, reacting an aromatic hydroxy compound with an oxidizing agent in a biphasic solvent system. The reaction is carried out in the presence of a transition metal hydroxy phosphate catalyst to produce the corresponding hydroquinone compound.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: December 12, 2006
    Assignee: General Electric Company
    Inventors: Jegadeesh Thampi, Sunil Ashtekar, Pramod Kumbhar, Rathinam Jothi Mahalingam
  • Patent number: 7087705
    Abstract: A continuous process comprising: contacting a mixture comprising dihydroxy aromatic compound, water and an alkylating agent with a catalyst system in the presence of a flowing carrier gas, to form a mono alkylated dihydroxy aromatic compound, wherein the catalyst system is obtained by the calcination of a catalyst precursor system comprising a metal oxide precursor, a transition metal element and a pore former.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: August 8, 2006
    Assignee: General Electric Company
    Inventors: Sunil Ashtekar, Pramod Kumbhar, Rathinam Jothi Mahalingam, Jegadeesh Thampi
  • Patent number: 7015365
    Abstract: A process for forming a cycloalkylidene bisphenol comprises: reacting a cycloalkanone compound of formula: where [A] is a substituted or an unsubstituted aromatic group, R1–R4 independently represent a hydrogen or a C1–C12 hydrocarbyl group; and “a” and “b” are integers independently having values from 0–3; with an aromatic hydroxy compound of formula [A]-OH, where [A] is as previously described; at a mole ratio of greater than or equal to about 20, in the presence of a sulfonic acid type ion exchange resin catalyst crosslinked with greater than or equal to about 8 weight percent of divinylbenzene, and a promoter selected from the group consisting of a mercaptan compound and a resorcinol compound; to form a cycloalkylidene bisphenol of formula: where [A], R1–R4, “a” and “b” are as previously described. Moreover, any acid catalyst can be used with a resorcinol promoter.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: March 21, 2006
    Assignee: General Electric Company
    Inventors: Debjani Kapila, Ramesh Krishnamurti, Jan-Pleun Lens, Gurram Kishan, Nileshkumar Kukalyekar, Jegadeesh Thampi, Umesh Krishna Hasyagar, Vinod Kumar Rai, Ashok S. Shyadligeri, Radhakrishna Sreenivasarao Arakali, Edward J. Nesakumar, Pramod Kumbhar
  • Publication number: 20060025634
    Abstract: A process for the preparation of hydroquinone compounds comprising, reacting an aromatic hydroxy compound with an oxidizing agent in a biphasic solvent system. The reaction is carried out in the presence of a transition metal hydroxy phosphate catalyst to produce the corresponding hydroquinone compound.
    Type: Application
    Filed: July 30, 2004
    Publication date: February 2, 2006
    Inventors: Jegadeesh Thampi, Sunil Ashtekar, Pramod Kumbhar, Rathinam Mahalingam
  • Patent number: 6982354
    Abstract: A method of preparing a polycyclic compound containing a ketone functionality comprising: reacting a mixture comprising a catalyst, a reactant compound and an amount of water greater than or equal to 3 weight percent (wt %) based on the weight of the reactant compound; wherein said catalyst comprises nickel and base and said reactant compound comprises at least two fused rings, A and B wherein ring A is a saturated ring or ring system having 5 to 7 cyclic carbons and substituted with a hydroxyl functionality and ring B is a non-aromatic unsaturated ring having 5 to 6 cyclic carbons; and converting the hydroxyl functionality of ring A to a ketone functionality and non-aromatic unsaturated ring B to a saturated ring.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: January 3, 2006
    Assignee: General Electric Company
    Inventors: Jegadeesh Thampi, Umesh Krishna Hasyagar, Anju S. Shukla, Pramod Kumbhar
  • Publication number: 20050222372
    Abstract: A continuous process comprising: contacting a mixture comprising dihydroxy aromatic compound, water and an alkylating agent with a catalyst system in the presence of a flowing carrier gas, to form a mono alkylated dihydroxy aromatic compound, wherein the catalyst system is obtained by the calcination of a catalyst precursor system comprising a metal oxide precursor, a transition metal element and a pore former.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 6, 2005
    Inventors: Sunil Ashtekar, Pramod Kumbhar, Rathinam Mahalingam, Jegadeesh Thampi
  • Publication number: 20050222466
    Abstract: A process for producing a phenol product generally comprises a first step comprising reacting in a first reactor a feed stream comprising cumene hydroperoxide and water with an acid catalyst to produce an effluent comprising the phenol product, acetone, and at least 1% by weight residual cumene hydroperoxide, and a second step comprising passing the effluent into a second reactor and decomposing the residual cumene hydroperoxide, wherein during said process the ratio of phenol to acetone is maintained at a molar ratio of greater than 1:1, and wherein the water in each of the first and second steps is present in an amount more than 0 and less than or equal to 5 weight percent based on the total weight of the feed stream or effluent, and wherein the process is continuous.
    Type: Application
    Filed: March 29, 2005
    Publication date: October 6, 2005
    Inventors: Prashant Tatake, Pramod Kumbhar, Bharat Singh, John Fulmer, Sabyasachi Mandal, Arun Kumar, Rupesh Pawar
  • Publication number: 20050209431
    Abstract: A polycarbonate comprises structural units derived from a compound comprising a ketone functionality and at least two fused rings, A and B wherein ring A is a saturated ring or ring system having 5 to 7 cyclic carbons and substituted with a ketone functionality and ring B is a saturated ring having 5 to 6 cyclic carbons
    Type: Application
    Filed: May 19, 2005
    Publication date: September 22, 2005
    Inventors: Jegadeesh Thampi, Umesh Hasyagar, Anju Shukla, Pramod Kumbhar
  • Publication number: 20050171386
    Abstract: A method of preparing a polycyclic compound containing a ketone functionality comprising: reacting a mixture comprising a catalyst, a reactant compound and an amount of water greater than or equal to 3 weight percent (wt %) based on the weight of the reactant compound; wherein said catalyst comprises nickel and base and said reactant compound comprises at least two fused rings, A and B wherein ring A is a saturated ring or ring system having 5 to 7 cyclic carbons and substituted with a hydroxyl functionality and ring B is a non-aromatic unsaturated ring having 5 to 6 cyclic carbons; and converting the hydroxyl functionality of ring A to a ketone functionality and non-aromatic unsaturated ring B to a saturated ring.
    Type: Application
    Filed: February 2, 2004
    Publication date: August 4, 2005
    Inventors: Jegadeesh Thampi, Umesh Hasyagar, Anju Shukla, Pramod Kumbhar
  • Publication number: 20050137409
    Abstract: A process for the preparation of benzoquinones and hydroquinones includes oxidizing an aromatic hydroxy compound with oxygen or an oxygen containing gas, a copper containing catalyst, and optionally a promoter to form the benzoquinone. A reduction reaction is employed to form the hydroquinone.
    Type: Application
    Filed: December 9, 2004
    Publication date: June 23, 2005
    Inventors: Sunil Ashtekar, Pramod Kumbhar, Jan-Pleun Lens, Rathinam Mahalingam, Nadkarni Pradeep, Jegadeesh Thampi
  • Publication number: 20050137380
    Abstract: A process for the preparation of benzoquinones and hydroquinones includes oxidizing an aromatic hydroxy compound with oxygen or an oxygen containing gas, a copper containing catalyst, and a promoter to form the benzoquonone. A reduction reaction is employed to form the hydroquinone.
    Type: Application
    Filed: January 14, 2004
    Publication date: June 23, 2005
    Inventors: Rathinam Mahalingam, Sunil Ashtekar, Jegadeesh Thampi, Pramod Kumbhar
  • Publication number: 20050137428
    Abstract: A process for forming a cycloalkylidene bisphenol comprises: reacting a cycloalkanone compound of formula: where [A] is a substituted or an unsubstituted aromatic group, R1-R4 independently represent a hydrogen or a C1-C12 hydrocarbyl group; and “a” and “b” are integers independently having values from 0-3; with an aromatic hydroxy compound of formula [A]-OH, where [A] is as previously described; at a mole ratio of greater than or equal to about 20, in the presence of a sulfonic acid type ion exchange resin catalyst crosslinked with greater than or equal to about 8 weight percent of divinylbenzene, and a promoter selected from the group consisting of a mercaptan compound and a resorcinol compound; to form a cycloalkylidene bisphenol of formula: where [A], R1-R4, “a” and “b” are as previously described. Moreover, any acid catalyst can be used with a resorcinol promoter.
    Type: Application
    Filed: December 19, 2003
    Publication date: June 23, 2005
    Inventors: Debjani Kapila, Ramesh Krishnamurti, Jan-Pleun Lens, Gurram Kishan, Nileshkumar Kukalyekar, Jegadeesh Thampi, Umesh Hasyagar, Vinod Rai, Ashok Shyadligeri, Radhakrishna Arakali, Edward Nesakumar, Pramod Kumbhar
  • Patent number: 6897175
    Abstract: A metal oxide catalyst precursor composition comprises a pore former and a catalyst reagent.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: May 24, 2005
    Assignee: General Electric
    Inventors: David Parrillo, Pramod Kumbhar, Ashok Menon, Mukund Parthasarathy, Geuch Zijlma, Sunil Ashtekar
  • Patent number: 6635789
    Abstract: A process for separating sulfonic acid compounds from a phenolic solvent is provided by contacting the phenolic solvent with a hydrotalcite-type material (HTM). The process can be applied in the conventional industrial process for converting cumene to phenol to remove sulfonic acid compounds from the phenol product. A process and a facility for producing purified phenol by converting cumene to phenol are provided. In the conversion of cumene to phenol, the phenol often contains carbonyl-type impurities. The phenol and carbonyl-type impurities are reacted in the presence of a sulfonic acid cation exchange resin catalyst (IER) to produce a reaction product that may contain sulfonic acid compounds. The reaction product is contacted with an HTM to reduce the amount of sulfonic acid compounds which may be present and to produce a purified phenol-containing stream. The purified phenol-containing stream may be further purified using conventional separation techniques, such as distillation.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: October 21, 2003
    Assignee: General Electric Company
    Inventors: John W. Fulmer, Nitin Vaish, Pramod Kumbhar, Jacob L. Oberholtzer, R. Jothi Mahalingam
  • Publication number: 20030168329
    Abstract: A process for separating sulfonic acid compounds from a phenolic solvent is provided by contacting the phenolic solvent with a hydrotalcite-type material (HTM). The process can be applied in the conventional industrial process for converting cumene to phenol to remove sulfonic acid compounds from the phenol product. A process and a facility for producing purified phenol by converting cumene to phenol are provided. In the conversion of cumene to phenol, the phenol often contains carbonyl-type impurities. The phenol and carbonyl-type impurities are reacted in the presence of a sulfonic acid cation exchange resin catalyst (IER) to produce a reaction product that may contain sulfonic acid compounds. The reaction product is contacted with an HTM to reduce the amount of sulfonic acid compounds which may be present and to produce a purified phenol-containing stream. The purified phenol-containing stream may be further purified using conventional separation techniques, such as distillation.
    Type: Application
    Filed: March 6, 2002
    Publication date: September 11, 2003
    Inventors: John W. Fulmer, Nitin Vaish, Pramod Kumbhar, Jacob L. Oberholtzer, R. Jothi Mahalingam
  • Publication number: 20030073572
    Abstract: A metal oxide catalyst precursor composition comprises a pore former and a catalyst reagent.
    Type: Application
    Filed: September 19, 2002
    Publication date: April 17, 2003
    Inventors: David Parrillo, Pramod Kumbhar, Ashok Menon, Mukund Parthasarathy, Geuch Zijlma, Sunil Ashtekar
  • Patent number: 6486365
    Abstract: A process for converting carbonyl-type impurities contained in a phenolic solvent to high-boiling derivatives is provided by contacting the phenolic solvent with a hydrotalcite-type material (HTM). The phenol can be separated from the high-boiling derivatives using conventional separation techniques, such as distillation, so the invention also provides a process for separating carbonyl-type impurities, such as hydroxyacetone (HA), from a phenolic solvent. The process can be applied in the conventional industrial process for converting cumene to phenol to remove carbonyl-type impurities from the phenol product. A process and a facility for producing purified phenol by converting cumene to phenol are provided. In the conversion of cumene to phenol, the phenol often contains carbonyl-type impurities. The phenol and carbonyl-type impurities are reacted in the presence of an HTM to produce phenol and high-boiling derivatives.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: November 26, 2002
    Assignee: General Electric Company
    Inventors: John W. Fulmer, Bharat Singh, Pramod Kumbhar, Prashant Anil Tatake, Umesh Hasyagar
  • Patent number: 6448453
    Abstract: A method of preparing cumylphenol comprises reacting phenol and alpha-methylstyrene in the presence of an acid catalyst and an alkylbenzene. The method provides an inexpensive, selective process to cumylphenol.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: September 10, 2002
    Assignee: General Electric Company
    Inventors: Jake Oberholtzer, Pramod Kumbhar, Dave Sharber, Mannish V. Badani