Patents by Inventor Andre Lantz

Andre Lantz 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: 6639115
    Abstract: The invention relates to the synthesis of difluoromethane by gas-phase catalytic fluorination of methylene chloride. To lengthen the lifetime of the catalyst the operation is carried out in the presence of chlorine.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: October 28, 2003
    Assignee: Atofina
    Inventors: Benoit Requieme, Sylvain Perdrieux, Bernard Cheminal, Eric Lacroix, Andre Lantz
  • Patent number: 6395941
    Abstract: In order to remove the impurities (in particular 1-chloro-2,2-difluoroethylene) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a and hydrofluoric acid is treated in the gas phase, in the presence of a fluorination catalyst, at a temperature of between 200 and 380° C. and under a pressure between atmospheric pressure and 2.5 MPa, the HF/F134a molar ratio being between 0.05 and 0.5.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: May 28, 2002
    Assignee: Elf Atochem, S.A.
    Inventors: Bernard Cheminal, Andre Lantz
  • Patent number: 6339178
    Abstract: The subject of the invention is the manufacture of 1,1,1-trifluoroethane by fluorination or 1-chloro-1,1-difluoroethane with anhydrous hydrofluoric acid. The reaction is carried out in the liquid phase and in the presence of a fluorination catalyst.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: January 15, 2002
    Assignee: Atofina
    Inventors: Andre Lantz, Sylvain Perdrieux, Dominique Garrait, Laurent Wendlinger
  • Publication number: 20010003786
    Abstract: The invention relates to the synthesis of difluoromethane by gas-phase catalytic fluorination of methylene chloride.
    Type: Application
    Filed: January 18, 2001
    Publication date: June 14, 2001
    Applicant: ELF ATOCHEM S.A.
    Inventors: Benoit Requieme, Sylvain Perdrieux, Bernard Cheminal, Eric Lacroix, Andre Lantz
  • Patent number: 6242659
    Abstract: The invention relates to the synthesis of difluoromethane by gas-phase catalytic fluorination of methylene chloride. To lengthen the lifetime of the catalyst the operation is carried out in the presence of chlorine.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: June 5, 2001
    Assignee: Elf Atochem, S.A.
    Inventors: Benoit Requieme, Sylvain Perdrieux, Bernard Cheminal, Eric Lacroix, Andre Lantz
  • Patent number: 5990364
    Abstract: In order to purify a crude pentafluoroethane (F125) containing chloropentafluoroethane (F115), it is subjected to a heat treatment in the presence of hydrogen, the treatment being carried out at a temperature at least equal to 550.degree. C. and with an H.sub.2 /F115 molar ratio of at least 10.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: November 23, 1999
    Inventors: Jean-Pierre Schirmann, Serge Hub, Eric Lacroix, Andre Lantz
  • Patent number: 5951830
    Abstract: To remove the olefinic impurities from a hydrochlorofluoroethane of formula: CF.sub.3 --CHClX (X=H, F, or Cl), it is subjected to a photochlorination stage.
    Type: Grant
    Filed: October 16, 1997
    Date of Patent: September 14, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Rene Bertocchio, Andre Lantz, Daniel Roland, Bertrand Collier
  • Patent number: 5932776
    Abstract: The invention relates to catalytic fluorination of perchloroethylene or of pentachloroethane in the gas phase by means of hydrofluoric acid.A mixed catalyst is employed, made up of nickel and chromium oxides, halides and/or oxyhalides deposited on a support consisting of aluminium fluoride or of a mixture of aluminium fluoride and alumina.
    Type: Grant
    Filed: November 6, 1996
    Date of Patent: August 3, 1999
    Inventors: Bernard Cheminal, Eric Lacroix, Andre Lantz
  • Patent number: 5917098
    Abstract: 1,1,1,3,3-Pentachlorobutane, whose fluorination leads to 1,1,1,3,3-pentafluorobutane, is prepared with high yield and selectivity by addition of carbon tetrachloride to 2-chloropropene in the presence of a copper salt and an amine.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: June 29, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Rene Bertocchio, Andre Lantz, Laurent Wendlinger
  • Patent number: 5900514
    Abstract: The invention relates to the manufacture of difluoromethane by catalytic gas-phase fluorination of methylene chloride.The operation is carried out in the presence of oxygen at a temperature of between 330 and 450.degree. C. and with a bulk or supported chromium catalyst.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: May 4, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Benoit Requieme, Eric Lacroix, Andre Lantz
  • Patent number: 5892137
    Abstract: To remove the traces of chlorotrifluoroethylene (F1113) which are present in a pentafluoroethane (F125), the F125 is passed through a bed of active carbon.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: April 6, 1999
    Assignee: Elf Atochem S.A.
    Inventors: Rene Bertocchio, Andre Lantz
  • Patent number: 5750810
    Abstract: The present invention relates to the simultaneous manufacture of difluoromethane (F32) and 1,1,1,2-tetrafluoroethane (F134a) by pyrolysis of chlorodifluoromethane in the presence of hydrogen, working at a temperature above 500.degree. C. in the absence of any catalyst or metal surface. Depending on the operating conditions chosen, this process also makes it possible predominantly to manufacture either F134a or F32.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: May 12, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Pierre Schirmann, Serge Hub, Andre Lantz
  • Patent number: 5731481
    Abstract: The invention relates to the manufacture of 1,1,1,2-tetrafluoroethane (F134a) by gas-phase catalytic fluorination of 1-chloro-2,2,2-trifluoroethane (F133a).A mixed catalyst is employed, composed of nickel and chromium oxides, halides and/or oxyhalides deposited on a support consisting of aluminium fluoride or of a mixture of aluminium fluoride and alumina.This mixed catalyst makes it possible to obtain an excellent selectivity for F134a with a high production efficiency.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: March 24, 1998
    Assignee: Societe Atochem
    Inventors: Bernard Cheminal, Eric Lacroix, Andre Lantz
  • Patent number: 5705718
    Abstract: To remove the unsaturated impurities (in particular 1-chloro-2,2-difluoroethylene and polyfluoropropenes) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a, of hydrofluoric acid and of chlorine is treated in gaseous phase in the presence of a fluorination catalyst at a temperature of between 100.degree. and 300.degree. C. and at a pressure between atmospheric pressure and 2.5 MPa, the molar ratio HF/F134a being between 0.05 and 0.5 and the molar ratio Cl.sub.2 /F134a between 0.0001 and 0.1.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: January 6, 1998
    Assignee: Elf Atochem S.A.
    Inventors: Bernard Cheminal, Andre Lantz
  • Patent number: 5523500
    Abstract: The invention relates to mass catalysts based on chromium and nickel oxides, obtained from a sol of chromium and nickel hydroxides.These catalysts, in which the Ni/Cr atomic ratio is between 0.05 and 5, may be used from the fluorination of halogenated hydrocarbons by HF in the gas phase.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: June 4, 1996
    Assignee: d'Elf Atochem S.A.
    Inventors: Bernard Cheminal, Francois Garcia, Eric Lacroix, Andre Lantz
  • Patent number: 5453551
    Abstract: The invention relates to the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F15).The F-125-F115 mixture to be purified is subjected to a fluorination stage to convert F115 into hexafluoroethane (F116) which is then separated from F125, for example by distillation.
    Type: Grant
    Filed: February 17, 1994
    Date of Patent: September 26, 1995
    Assignee: Elf Atochem S.A.
    Inventors: Eric Lacroix, Andre Lantz, Bernard Cheminal
  • Patent number: 5430205
    Abstract: In order to remove the olefinic impurities (in particular 1-chloro-2,2-difluoroethylene and polyfluoropropenes) present in crude 1,1,1,2-tetrafluoroethane (F134a), a gaseous mixture of crude F134a, hydrofluoric acid and oxygen or air is treated in the gas phase, in the presence of a fluorination catalyst, at a temperature between 200.degree. and 350.degree. C. and at a pressure between atmospheric pressure and 2.5 MPa, the HF/F134a molar ratio being between 0.05 and 0.5 and the O.sub.2 /F134a molar ratio being between 0.001 and 0.1.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: July 4, 1995
    Assignee: Elf Atochem, S.A.
    Inventors: Bernard Cheminal, Andre Lantz, Eric Lacroix
  • Patent number: 5386068
    Abstract: In order to stabilize 1,1-dichloro-1-fluoroethane containing traces of vinylidene chloride, at least one ethylenic hydrocarbon containing at least 4 carbon atoms is added thereto.
    Type: Grant
    Filed: October 8, 1992
    Date of Patent: January 31, 1995
    Assignee: d'Elf Atochem S.A.
    Inventors: Andre Lantz, Rene Bertocchio, Patrick Lambert
  • Patent number: 5382723
    Abstract: The invention relates to the synthesis of hydrogenperfluoroalkanes R.sub.F H, R.sub.F denoting a perfluoroalkyl radical containing 2 to 20 carbon atoms, by reaction of the corresponding perfluoroalkyl iodide R.sub.F I with an alkali metal hydroxide.The use of methanol as solvent allows the formation of tars to be avoided, an almost total conversion of R.sub.F I and an R.sub.F H of excellent purity to be obtained, and the alkali metal iodide by-product to be recovered easily.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: January 17, 1995
    Assignee: Elf Atochem S.A.
    Inventors: Pierre Durual, Andre Lantz
  • Patent number: 5354928
    Abstract: The invention relates to a process for the manufacture of 1,1,1,2-tetrafluorochloroethane and of pentafluoroethane.The process which consists of gas phase catalytic fluorination of at least one pentahaloethane of formula C.sub.2 HX.sub.2-n F.sub.3+n in which X denotes a chlorine or bromine atom and n the number 0 or 1, by hydrofluoric acid, is characterized in that a catalyst is employed consisting of a catalytic quantity of chromium in an oxidation state equal to or greater than 3 and of an activated charcoal as support.The selectivity for 1,1,1,2-tetrafluorochloroethane and pentafluoroethane reaches approximately 95% and even more.
    Type: Grant
    Filed: May 24, 1993
    Date of Patent: October 11, 1994
    Assignee: Societe Atochem
    Inventors: Bernard Cheminal, Eric Lacroix, Andre Lantz