Patents by Inventor Leo E. Manzer

Leo E. Manzer 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).

  • Process for the separation of HF via Azeotropic distillation
    Patent number: 4944846
    Abstract: Process for the separation of hydrogen fluoride (HF), 2,2-dichloro-1,1,1-trifluoroethane (FC-123), and/or 2-chloro-1,1,1,2-tetrafluoroethane (FC-124) from mixtures containing them by controlling the molar ratio of HF/FC-123 in the mixture prior to subjecting the mixture to azeotropic distillation.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: July 31, 1990
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: Leo E. Manzer, V. N. Mallikarjuna Rao, Richard T. Rockwell, Michael A. Sisk, Edwin J. Warwas, Roy Winteringham
  • Reductive dechlorination of 1,1,1,2-tetrafluoro-2-chloroethane
    Patent number: 4935558
    Abstract: A process for the preparation of 1,1,1,2-tetrafluoroethane by reacting 1,1,1,2-tetrafluoro-2-chloroethane in a polar aprotic solvent with zinc in the presence of a proton source at a temperature from about 65.degree. C. to about 250.degree. C.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: June 19, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Carl G. Krespan, Leo E. Manzer
  • Gas-phase fluorination process
    Patent number: 4922037
    Abstract: An improved process for the manufacture of 1,1,1,2-tetrafluoroethane, more particularly, a gas-phase reaction of a 1,1,1-trifluorochloroethane with hydrogen fluoride in the presence of a selected metal on aluminum fluoride or carbon.
    Type: Grant
    Filed: May 19, 1989
    Date of Patent: May 1, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Leo E. Manzer
  • Process for the separation of HF via phase separation and distillation
    Patent number: 4911792
    Abstract: Process for the separation of HF, 2,2-dichloro-1,1,1-trifluoroethane (FC-123) and/or 2-chloro-1,1,1,2-tetrafluoroethane (FC-124) mixture by subjecting the mixture to a temperature from about -80.degree. C. to about 40.degree. C. and a pressure from about 0.10 MPa to about 3.55 MPa in a separation zone, whereby an organic phase having less than 15 mole percent of HF is formed as the bottom layer in the separation zone and an acid phase having at least 93 mole percent of HF is formed at the top in the separation zone.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: March 27, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Leo E. Manzer, V. N. Mallikarjuna Rao, Richard T. Rockwell, Michael A. Sisk, Edwin J. Warwas, Roy Winteringham
  • Isomerization of saturated fluorohydrocarbons
    Patent number: 4902838
    Abstract: A process for isomerizing saturated C.sub.2 to C.sub.6 fluorohydrocarbons having lesser thermodynamic stability to fluorohydrocarbons having greater thermodynamic stability comprising contacting in the gaseous phase at a temperature from about 200.degree. C. to about 475.degree. C. at least one C.sub.2 to C.sub.6 saturated fluorohydrocarbon with a catalyst composition comprising an aluminum fluoride.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: February 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Leo E. Manzer, V. N. Mallikarjuna Rao
  • Process for the manufacture of 1,1,1-trifluorodichloroethane and 1,1,1,2-tetrafluorochloroethane
    Patent number: 4843181
    Abstract: An improved gas-phase process for the manufacture of 1,1,1-trifluorodichloroethane and/or 1,1,1,2-tetrafluorochloroethane by contacting a suitable tetrahaloethylene and/or pentahaloethane with hydrogen fluoride in the presence of Cr.sub.2 O.sub.3, prepared by pyrolysis of (NH.sub.4).sub.2 Cr.sub.2 O.sub.7, the reaction being conducted under controlled conditions whereby the production of pentafluoroethane is minimized.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: June 27, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William H. Gumprecht, Leo E. Manzer, V. N. Mallikarjuna Rao
  • Gas-phase fluorination process
    Patent number: 4766260
    Abstract: An improved gas-phase process for the manufacture of 1,1,1-trifluorodichloroethane and 1,1,1,2-tetrafluorochloroethane by contacting a suitable tetrahaloethylene with hydrogen fluoride in the presence of a selected metal on a high fluorine content alumina support, the reaction being conducted under controlled conditions whereby the production of pentafluoroethane is minimized.
    Type: Grant
    Filed: July 7, 1987
    Date of Patent: August 23, 1988
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Leo E. Manzer, V. N. Mallikarjuna Rao
  • Gas-phase fluorination process
    Patent number: 4766259
    Abstract: An improved gas-phase process for the manufacture of 1,1-difluoro-1,2-dichloroethane and 1-fluoro-1,1,2-trichloroethane by contacting a suitable trihaloethylene and/or a tetrahaloethane with hydrogen fluoride in the presence of a metal in combination with a high fluorine content alumina, the reaction being preferably conducted under controlled conditions whereby the production of 1,1,1-trifluorochloroethane is minimized.
    Type: Grant
    Filed: August 13, 1987
    Date of Patent: August 23, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Leo E. Manzer, V. N. Mallikarjuna Rao