Patents by Inventor Velliyur Nott Mallikarjuna Rao

Velliyur Nott Mallikarjuna Rao 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: 8101094
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be a terpene, terpenoid or fullerene; or a mixture of a terpene, terpenoid or fullerene with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: January 24, 2012
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Jon Lee Howell, Velliyur Nott Mallikarjuna Rao, Thomas J. Leck, Barbara Haviland Minor, Mario Joseph Nappa, Nandini C. Mouli, Ekaterina Swearingen, Andrew Edward Feiring
  • Publication number: 20120004475
    Abstract: Disclosed herein are processes for the production of hydrofluoroolefins including 2,3,3,4,4,4-hexafluoro-1-butene by dehydrofluorination. Also disclosed herein are processes for separation of hydrofluoroolefins from hydrofluorocarbons and from hydrogen fluoride.
    Type: Application
    Filed: September 14, 2011
    Publication date: January 5, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: RALPH NEWTON MILLER, MARIO JOSEPH NAPPA, VELLIYUR NOTT MALLIKARJUNA RAO, ALLEN CAPRON SIEVERT
  • Patent number: 8075796
    Abstract: The present invention relates to compositions comprising at least one fluoroolefin and an effective amount of stabilizer that may be at least one phenol or a mixture of at least one phenol with other stabilizers. The stabilized compositions may be useful in cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps, as well as in applications as foam blowing agents, solvents, aerosol propellants, fire extinguishants, and sterilants.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: December 13, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Mario Josph Nappa, Barbara Haviland Minor, Thomas J. Leck, Nandini C. Mouli
  • Patent number: 8058489
    Abstract: A process is disclosed for making CF3CF?CHF or mixtures thereof with CF2?CFCHF2.
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: November 15, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Patent number: 8053611
    Abstract: A process is disclosed for the manufacture of 1,1,1,3,3,3-hexafluoropropane and 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and/or 1,1,1,2,3,3,3-heptafluoropropane. The process involves (a) reacting HF, Cl2, and at least one halopropene of the formula CX3CCl?CClX (where each X is independently F or Cl) to produce a product comprising CF3CCl2CF3 and CF3CClFCClF2; (b) reacting CF3CCl2CF3 and CF3CClFCClF2 produced in (a) with hydrogen, optionally in the presence of HF, to produce a product comprising CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3; and (c) recovering from the product produced in (b), CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3. In (a), the CF3CCl2CF3 and CF3CClFCClF2 are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: November 8, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Allen Capron Sievert, Shekhar Subramoney
  • Patent number: 8044252
    Abstract: A process is disclosed to increase the Z/E ratio of 1,2,3,3,3-pentafluoropropene. The process involves contacting a starting material comprising 1,2,3,3,3-pentafluoropropene with a catalyst on AlF3 or carbon, wherein the catalyst is selected from the group consisting of SbClwF5-w, TiClxF4-x, SnClyF4-y and TaCl2F5-z wherein w is from 0 to 4, x is from 0 to 3, y is from 0 to 3, z is from 0 to 4, to obtain a product wherein the Z/E ratio of 1,2,3,3,3-pentafluoropropene is increased relative to the Z/E ratio of 1,2,3,3,3-pentafluoropropene in the starting material. A process is also disclosed to decrease the Z/E ratio of 1,2,3,3,3-pentafluoropropene.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: October 25, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Mario Joseph Nappa, Donald J. Toton, Velliyur Nott Mallikarjuna Rao
  • Publication number: 20110257444
    Abstract: Disclosed herein are azeotrope and near-azeotrope compositions comprising E-1,1,1,2,3-pentafluoropropene (E-HFC-1225ye) and hydrogen fluoride. The azeotrope and near-azeotrope compositions are useful in processes to produce and in processes to purify E-HFC-1225ye and/or Z-1,1,1,2,3-pentafluoropropene (Z-HFC-1225ye). Also disclosed are processes for the extractive distillation to separate E-HFC-1225ye from Z-HFC-1225ye.
    Type: Application
    Filed: June 28, 2011
    Publication date: October 20, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: JEFFREY P. KNAPP, Barry Asher Mahler, Velliyur Nott Mallikarjuna Rao
  • Publication number: 20110245350
    Abstract: A process is disclosed for making CF3CF?CH2 or mixtures thereof with CHF?CFCHF2. The process involves contacting CCl3CF2CF3 and optionally CCl2FCF2CClF2 with H2 in the presence of a catalyst including a catalytically effective amount of palladium supported on a support of alumina, fluorided alumina and/or aluminum fluoride, to produce a product mixture including CH2?CFCF3 (and when CCl2FCF2CClF2 is present, CHF?CFCHF2); recovering CH2?CFCF3 or a mixture thereof with CHF?CFCHF2 from the product mixture; and optionally, separating at least a portion of any CHF?CFCHF2 in the product mixture from the CH2?CFCF3 in the product mixture. The mole ratio of H2 to the total of CCl3CF2CF3 and CCl2FCF2CClF2 fed to the reaction zone is between about 1:1 and about 5:1.
    Type: Application
    Filed: June 9, 2011
    Publication date: October 6, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: MARIO JOSEPH NAPPA, Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Publication number: 20110237845
    Abstract: A process is disclosed for making CF3CF?CHF. The process involves contacting at least one hexafluoropropane selected from the group consisting of CF3CF2CH2F and CF3CHFCHF2 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CF?CHF, and recovering CF3CF?CHF from the product mixture. A process is disclosed for making CF3CH?CHF. The process involves contacting CF3CH2CHF2 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CH?CHF, and recovering CF3CH?CHF from the product mixture. A process is disclosed for making CF3CF?CH2. The process involves contacting CF3CF2CH3 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CF?CH2, and recovering CF3CF?CH2 from the product mixture.
    Type: Application
    Filed: June 3, 2011
    Publication date: September 29, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: MARIO Joseph NAPPA, Velliyur Nott Mallikarjuna Rao
  • Patent number: 8017817
    Abstract: A process for the manufacture of CF3CH?CF2 and CF3CF?CHF is disclosed. The process involves (a) reacting HF and chlorine and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or Cl) to produce a product including both CF3CCI2CF3 and CF3CCIFCCIF2; (b) reacting CF3CCI2CF3 and CF3CCIFCCIF2 produced in (a) with hydrogen to produce a product including both CF3CH2CF3 and CF3CHFCHF2; (c) dehydrofluorinating CF3CH2CF3 and CF3CHFCHF2 produced in (b) to produce a product including both CF3CH?CF2 and CF3CF?CHF; and (d) recovering CF3CH?CF2 and CF3CF?CHF from the product produced in (c). In (a), both CF3CCI2CF3 and CF3CCIFCCIF2 are produced in the presence of a chlorofluorination catalyst consisting of (i) compositions comprising a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by copper, and (H) compositions of (i) which have been treated with a fluorinating agent.
    Type: Grant
    Filed: August 4, 2006
    Date of Patent: September 13, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Allen Capron Sievert, Shekhar Subramoney
  • Patent number: 8007677
    Abstract: Disclosed herein are azeotrope and near-azeotrope compositions comprising E-1,1,1,2,3-pentafluoropropene (E-HFC-1225ye) and hydrogen fluoride. The azeotrope and near-azeotrope compositions are useful in processes to produce and in processes to purify E-HFC-1225ye and/or Z-1,1,1,2,3-pentafluoropropene (Z-HFC-1225ye). Also disclosed are processes for the extractive distillation to separate E-HFC-1225ye from Z-HFC-1225ye.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: August 30, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Jeffrey P. Knapp, Barry Asher Mahler, Velliyur Nott Mallikarjuna Rao
  • Publication number: 20110204279
    Abstract: The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.
    Type: Application
    Filed: April 28, 2011
    Publication date: August 25, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: BARBARA HAVILAND MINOR, VELLIYUR NOTT MALLIKARJUNA RAO
  • Patent number: 7981311
    Abstract: Halocarbons of the structure CF3CF2CH2X, wherein X is either F or Cl or mixtures thereof prepared by: contacting at least one 2-fluorochloropropane with hydrogen fluoride in a first fluorination step in the gas phase or liquid phase under substantially anhydrous conditions, in the absence of added catalyst to partially fluorinate said 2-fluorochloropropane; contacting said partially fluorinated 2-fluorochloropropane with at least the stoichiometric molar equivalent of hydrogen fluoride under substantially anhydrous conditions, in the presence of at least one fluorination catalyst in a second fluorination step; removing said reaction products from contact with said catalyst, and isolating a substantial yield of at least 1,1,1,2,2,3-hexafluoropropane or 1,1,1,2,2,penta-3-chloropropane, or mixtures thereof, respectively.
    Type: Grant
    Filed: September 5, 2007
    Date of Patent: July 19, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mario Joseph Nappa, Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert, Jeffrey P. Knapp
  • Patent number: 7982073
    Abstract: A process is disclosed for making CF3CF?CHF. The process involves contacting at least one hexafluoropropane selected from the group consisting of CF3CF2CH2F and CF3CHFCHF2 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CF?CHF, and recovering CF3CF?CHF from the product mixture. A process is disclosed for making CF3CH?CHF. The process involves contacting CF3CH2CHF2 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CH?CHF, and recovering CF3CH?CHF from the product mixture. A process is disclosed for making CF3CF?CH2. The process involves contacting CF3CF2CH3 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CF?CH2, and recovering CF3CF?CH2 from the product mixture.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: July 19, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mario Joseph Nappa, Velliyur Nott Mallikarjuna Rao
  • Patent number: 7959825
    Abstract: The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: June 14, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Velliyur Nott Mallikarjuna Rao, Donald Bernard Bivens, Deepak Perti, Mark Steven Baunchalk
  • Publication number: 20110118514
    Abstract: A process is disclosed for the manufacture of 1,1,1,3,3,3-hexafluoropropane and 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and/or 1,1,1,2,3,3,3-heptafluoropropane. The process involves (a) reacting HF, Cl2, and at least one halopropene of the formula CX3CCI?CCIX (where each X is independently F or CI) to produce a product comprising CF3CCI2CF3 and CF3CCIFCCIF2; (b) reacting CF3CCI2CF3 and CF3CCIFCCIF2 produced in (a) with hydrogen, optionally in the presence of HF, to produce a product comprising CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3; and (c) recovering from the product produced in (b), CF3CH2CF3 and at least one of CHF2CHFCF3, CF3CF?CF2 and CF3CFHCF3. In (a), the CF3CCI2CF3 and CF3CCIFCCIF2 are produced in the presence of a chlorofluorination catalyst including (i) a crystalline alpha-chromium oxide where at least 0.
    Type: Application
    Filed: August 4, 2006
    Publication date: May 19, 2011
    Inventors: Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Allen Capron Sievert, Shekhar Subramoney
  • Publication number: 20110118512
    Abstract: Disclosed herein are processes for the production of hydrofluoroolefins by dehydrofluorination. Also disclosed herein are processes for separation of hydrofluoroolefins from hydrofluorocarbons and from hydrogen fluoride.
    Type: Application
    Filed: January 25, 2011
    Publication date: May 19, 2011
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: RALPH NEWTON MILLER, MARIO JOSEPH NAPPA, VELLIYUR NOTT MALLIKARJUNA RAO, ALLEN CAPRON SIEVERT
  • Patent number: 7943015
    Abstract: A photochemical reaction apparatus including a reactor and a light source situated so that light from the light source is directed through a portion of the reactor wall is disclosed. The apparatus is characterized by the portion of the reaction wall comprising a copolymer of a perfluoro (alkyl vinyl ether). The perfluoro (alkyl vinyl ether) is selected from the group consisting of CF30CF?CF2, C2F5OCF?CF2, C3F7OCF?F2, and mixture thereof. Also disclosed is a photochemical reaction process wherein light from a light source is directed through said reactor wall to interact with reactants in said reactor. A process for increasing the fluorine content of at least one compound selected from hydrocarbons and halohydrocarbons, comprising: (a) photochlorinating said at least one compound; and (b) reacting the halogenated hydrocarbon produced in (a) with HF.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: May 17, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Publication number: 20110105808
    Abstract: A process for the manufacture of CF3CH?CF2 and CF3CF?CHF is disclosed. The process involves (a) reacting HF and chlorine and at least one halopropene of the formula CX3CCl?CClX (where each X is independently F or Cl) to produce a product including both CF3CCl2CF3 and CF3CCIFCClF2; (b) reacting CF3CCl2CF3 and CF3CCIFCClF2 produced in (a) with hydrogen to produce a product including both CF3CH2CF3 and CF3CHFCHF2; (c) dehydrofluorinating CF3CH2CF3 and CF3CHFCHF2 produced in (b) to produce a product including both CF3CH?CF2 and CF3CF?CHF; and (d) recovering CF3CH?CF2 and CF3CF?CHF from the product produced in (c). In (a), both CF3CCl2CF3 and CF3CCIFCClF2 are produced in the presence of a chlorofluorination catalyst consisting of (i) compositions comprising a crystalline alpha-chromium oxide where at least 0.05 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by copper, and (H) compositions of (i) which have been treated with a fluorinating agent.
    Type: Application
    Filed: August 4, 2006
    Publication date: May 5, 2011
    Inventors: Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Allen Capron Sievert, Shekhar Subramoney
  • Patent number: 7914698
    Abstract: The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: March 29, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Velliyur Nott Mallikarjuna Rao, Donald Bernard Bivens, Deepak Perti, Mark Steven Baunchalk