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).

  • Processes for producing 2,3,3,3-tetrafluoropropene, a process for producing 1-chloro-2,3,3,3-pentafluoropropane and azeotropic compositions of 1-chloro-2,3,3,3-tetrafluoropropene with HF
    Patent number: 7906693
    Abstract: A process is disclosed for making CH2?CFCF3. The process involves contacting CH2ClCF2CF3 with H2 in a reaction zone in the presence of a catalyst including a catalytically effective amount of palladium supported on a support selected from chromium oxide, fluorinated chromium oxide, chromium fluoride, aluminum oxide, aluminum fluoride and/or fluorinated alumina, to produce CH2?CFCF3. The mole ratio of H2 to the CH2ClCF2CF3 fed to the reaction zone is between about 1:1 and about 4:1.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: March 15, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Mario Joseph Nappa, Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Compositions comprising a fluoroolefin
    Patent number: 7906037
    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 15, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Velliyur Nott Mallikarjuna Rao
  • Process for production of azeotrope compositions comprising hydrofluoroolefin and hydrogen fluoride and uses of said azeotrope compositions in separation processes
    Patent number: 7897823
    Abstract: Disclosed herein is a process to produce an azeotrope composition comprising a hydrofluoroolefin and hydrogen fluoride, said process comprising, dehydrofluorinating a hydrofluorocarbon containing at least one hydrogen and at least one fluorine on adjacent carbons, thereby forming a mixture comprising said hydrofluoroolefin, unreacted hydrofluorocarbon and hydrogen fluoride, and distilling the mixture to produce a distillate composition comprising an azeotrope composition containing said hydrofluoroolefin and hydrogen fluoride and a column bottoms composition comprising said hydrofluorocarbon essentially free of hydrogen fluoride. Also disclosed herein are processes for separation of hydrofluoroolefins from hydrofluorocarbons and from hydrogen fluoride.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: March 1, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ralpha Newton Miller, Mario Joseph Nappa, Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Azeotrope compositions of octafluorocyclobutane and uses thereof
    Patent number: 7888539
    Abstract: The present disclosure related to azeotrope and near-azeotrope compositions comprising PFC-C318 and HFC-236cb. The present disclosure further relates to processes for removing PFC-C318 from HFC-236cb. And the present disclosure further relates to azeotrope and near azeotrope compositions comprising hydrogen fluoride and PFC-C318.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: February 15, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Jeffrey P. Knapp
  • Compositions comprising a fluoroolefin
    Patent number: 7879253
    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: February 1, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Velliyur Nott Mallikarjuna Rao
  • Process for producing 2,3,3,3-tetrafluoropropene
    Patent number: 7872161
    Abstract: A process is disclosed for making CF3CF?CH2 The process involves (i) contacting CHCl2CF2CF3 in a reaction zone in the presence of a catalytically effective amount of a dehydrofluorination catalyst to produce CCl2?CFCF3; (ii) contacting CCl2?CFCF3 with H2 formed in (i) in a reaction zone in the presence of a catalyst comprising a catalytically effective amount of palladium supported on a support selected from the group consisting of alumina fluorided alumina, aluminum fluoride and mixtures thereof, to produce a product mixture comprising CF3CF?CH2, wherein the mole ratio of H2 to CCl2?CFCF3 fed to the reaction zone is between about 1:1 and about 4:1 and (iii) recovering CF3CF?CH2 from the product mixture formed in (ii).
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: January 18, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Compositions comprising a fluoroolefin
    Patent number: 7862741
    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: January 4, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Velliyur Nott Mallikarjuna Rao
  • Compositions comprising a fluoroolefin
    Patent number: 7862740
    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: January 4, 2011
    Assignee: E.I. Du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Velliyur Nott Mallikarjuna Rao
  • Compositions comprising a fluoroolefin
    Patent number: 7862742
    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: January 4, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Velliyur Nott Mallikarjuna Rao
  • PROCESSES FOR PRODUCING 2,3,3,3-TETRAFLUOROPROPENE AND/OR 1,2,3,3-TETRAFLUOROPROPENE
    Publication number: 20100320412
    Abstract: A process is disclosed for making CF3CF?CH2 or mixtures thereof with CHF2CF?CHF. This process involves (a) reacting CHCl2CF2CF3, and optionally CHClFCF2CClF2, with H2 in the presence of a catalytically effective amount of a hydrogenation catalyst to form CH3CF2CF3 and, when CHClFCF2CClF2 is present, CH2FCF2CHF2; (b) dehydrofluorinating CH3CF2CF3, and optionally any CH2FCF2CHF2, from (a) to form a product mixture including CF3CF?CH2 and, if CH2FCF2CHF2 is present, CHF2CF?CHF; and optionally (c) recovering CF3CF?CH2, or a mixture thereof with CHF2CF?CHF from the product mixture formed in (b) and/or (d) separating at least a portion of any CHF2CF?CHF in the product mixture formed in (b) from the CF3CF?CH2 in the product mixture formed in (b).
    Type: Application
    Filed: October 31, 2007
    Publication date: December 23, 2010
    Applicant: E.I DU PONT DE NEMOURS AND COMPANY
    Inventors: Mario Joseph Nappa, Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • PRODUCTION PROCESSES FOR MAKING 1,1,1,2,2,3-HEXAFLUOROPROPANE
    Publication number: 20100305371
    Abstract: A process for making HFC-236cb is disclosed. The process comprises reacting TFE with HFC-32 in the presence of at least one co-product and a suitable catalyst to produce a product mixture comprising HFC-236cb, wherein the total amount of the at least one co-product is at least 10 ppmv based on the total amount of the tetrafluoroethylene, the difluoromethane and the at least one co-product.
    Type: Application
    Filed: September 4, 2007
    Publication date: December 2, 2010
    Applicant: E.I.DU PONT NEMOURS AND COMPANY
    Inventors: Barry Asher Mahler, Xuehui Sun, Velliyur Nott Mallikarjuna Rao
  • TERPENE, TERPENOID, AND FULLERENE STABILIZERS FOR FLUOROOLEFINS
    Publication number: 20100288965
    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: Application
    Filed: August 31, 2007
    Publication date: November 18, 2010
    Applicant: 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
  • Tetrafluoropropene production processes
    Patent number: 7833434
    Abstract: A process is disclosed for producing 2,3,3,3-tetrafluoropropene and 1,3,3,3-tetrafluoropropene. The process involves pyrolyzing 1,1,1,2,3-pentafluoropropane.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: November 16, 2010
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Mario Joseph Nappa, Allen Capron Sievert
  • Tetrafluoropropene Production Processes
    Publication number: 20100200798
    Abstract: A process is disclosed for the manufacture of CF3CF=CH2 and CF3CH=CHF. The process involves dehydrofluorinating CF3CHFCH2F in the presence of a dehydrofluorination catalyst to produce a product mixture comprising CF3CF=CH2 and CF3CH=CHF, and recovering said CF3CF=CH2 and CF3CH=CHF from the product mixture. The present invention also provides a composition comprising (a) the Z-isomer of CF3CH=CHF and (b) HF; wherein the HF is present in an effective amount to form an azeotropic combination with the Z-CF3CH=CHF.
    Type: Application
    Filed: April 13, 2010
    Publication date: August 12, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: VELLIYUR NOTT MALLIKARJUNA RAO, Mario Joseph Nappa, Allen Capron Sievert
  • AZEOTROPE COMPOSITIONS COMPRISING DECAFLUOROPENTANE AND HYDROGEN FLUORIDE AND USES THEREOF
    Publication number: 20100203167
    Abstract: Disclosed herein are azeotrope compositions comprising 1,2,3,3,3-pentafluoropropene and hydrogen fluoride. The azeotrope compositions are useful in processes to produce and in processes to purify 1,2,3,3,3-pentafluoropropene. Additionally, disclosed herein are azeotrope and near-azeotrope compositions comprising 1,1,1,2,3,4,4,5,5,5-decafluoropentane and hydrogen fluoride.
    Type: Application
    Filed: April 26, 2010
    Publication date: August 12, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Ralph Newton Miller, Mario Joseph Nappa, Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • AZEOTROPE COMPOSITIONS COMPRISING 1,1,1,2,3-PENTAFLUOROPROPENE AND HYDROGEN FLUORIDE AND USES THEREOF
    Publication number: 20100187464
    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: September 7, 2007
    Publication date: July 29, 2010
    Applicant: E.I. Du Pint De Nemours and Company
    Inventors: Jeffrey P. Knapp, Barry Asher Mahler, Velliyur Nott Mallikarjuna Rao
  • PROCESSES FOR THE PRODUCTION OF FLUOROPROPANES AND HALOPROPENES
    Publication number: 20100168482
    Abstract: A process is disclosed for making CF3CF2CH3, CF3CF?CH2 and/or CF3CCl?CH2. The process involves reacting at least one starting material selected from the group consisting of halopropanes of the formula CX3CH2CH2X, halopropenes of the formula CX3CH?CH2 and halopropenes of the formula CX2?CHCH2X, wherein each X is independently F or Cl, with HF and Cl2 in a reaction zone to produce a product mixture comprising HF, HCl, CF3CF2CH3, CF3CF?CH2, and CF3CCl?CH2; and recovering the CF3CF2CH3, CF3CF?CH2 and/or CF3CCl?CH2 from the product mixture. Also disclosed is a process for making CF3CH2CHF2, CF3CH?CHF, and/or CF3CH?CHCl.
    Type: Application
    Filed: October 31, 2007
    Publication date: July 1, 2010
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert
  • Copper-Substituted Chromium Oxide Compositions, Their Preparation, and Their Use as Catalysts and Catalyst Precursors
    Publication number: 20100152503
    Abstract: A crystalline alpha-chromium oxide where from about 0.05 atom % to about 5 atom % of the chromium atoms in the alpha-chromium oxide lattice are replaced by divalent copper (Cu+2) atoms is disclosed. Also disclosed is a chromium-containing catalyst composition comprising as a chromium-containing component the crystalline copper-substituted alpha-chromium oxide; and methods for preparing a composition comprising the crystalline copper-substituted alpha-chromium oxide. One method involves (a) co-precipitating a solid by adding ammonium hydroxide to an aqueous solution of a soluble copper salt and a soluble trivalent chromium salt that contains at least three moles of nitrate per mole of chromium in the solution and has a copper concentration of from about 0.
    Type: Application
    Filed: August 4, 2006
    Publication date: June 17, 2010
    Inventors: Velliyur Nott Mallikarjuna Rao, H. David Rosenfeld, Allen Sievert, Shekhar Subramoney
  • Tetrafluoropropene production processes
    Patent number: 7722781
    Abstract: A process is disclosed for the manufacture of CF3CF?CH2 and CF3CH?CHF. The process involves dehydrofluorinating CF3CHFCH2F in the presence of a dehydrofluorination catalyst to produce a product mixture comprising CF3CF?CH2 and CF3CH?CHF, and recovering said CF3CF?CH2 and CF3CH?CHF from the product mixture. The present invention also provides a composition comprising (a) the Z-isomer of CF3CH?CHF and (b) HF; wherein the HF is present in an effective amount to form an azeotropic combination with the Z—CF3CH?CHF.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: May 25, 2010
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Velliyur Nott Mallikarjuna Rao, Mario Joseph Nappa, Allen Capron Sievert
  • DEHYDROFLUORINATION PROCESS TO MANUFACTURE HYDROFLUOROOLEFINS
    Publication number: 20100121115
    Abstract: Disclosed is a process for the manufacture of hydrofluoroolefins of the structure CF3CF?CHY, wherein Y can be H or F, comprising reacting at least one fluoropropane reactant of the structure CF3CFXCFYH1 wherein X can be either F or H, and Y can be either F or H, provided that both X and Y? are not both F, with a basic aqueous solution in the presence of a non-aqueous, non-alcoholic solvent, and in the presence of a phase transfer catalyst.
    Type: Application
    Filed: September 5, 2007
    Publication date: May 13, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Velliyur Nott Mallikarjuna Rao, Allen Capron Sievert, Mario Joseph Nappa