Patents by Inventor Patricia Cheung

Patricia Cheung 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).

  • Publication number: 20140088328
    Abstract: A hydrogenation process is disclosed. The process involves reacting a fluoroolefin with H2 in a reaction zone in the presence of a palladium catalyst to produce a hydrofluoroalkane product, wherein the palladium catalyst comprises palladium supported on a carrier wherein the palladium concentration is from about 0.001 wt % to about 0.2 wt % based on the total weight of the palladium and the carrier. Also disclosed is a palladium catalyst composition consisting essentially of palladium supported on ?-Al2O3 wherein the palladium concentration is from about 0.001 wt % to about 0.2 wt % based on the total weight of the palladium and the ?-Al2O3. Also disclosed is a hydrogenation process comprising reacting a fluoroolefin with H2 in a reaction zone in the presence of a palladium catalyst to produce a hydrofluoroalkane product, characterized by: the palladium catalyst consisting essentially of palladium supported on ?-Al2O3 wherein the palladium concentration is from about 0.001 wt % to about 0.
    Type: Application
    Filed: May 16, 2012
    Publication date: March 27, 2014
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Patricia Cheung, Allen Capron Sievert, Concetta Lamarca
  • Publication number: 20120046505
    Abstract: A process is disclosed for reducing the amount of monofluoroacetate. The process involves (a) contacting a hydrofluorocarbon with a reactant basic aqueous solution to produce an organic phase solution containing a hydrofluoroolefin and an aqueous phase solution containing a monofluoroacetate; and (b) heating the aqueous phase solution to an effective temperature to reduce the amount of monofluoroacetate in the aqueous phase solution, wherein fluoride concentration in the aqueous phase solution is substantially high. Another process is disclosed for reducing the amount of monofluoroacetate.
    Type: Application
    Filed: May 7, 2010
    Publication date: February 23, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Mario Joseph Nappa, Patricia Cheung, Karl R. Krause, Michael A. Sisk
  • Patent number: 7465822
    Abstract: A product comprising a lower alkyl ester of a lower aliphatic carboxylic acid is produced by a process comprising reacting under substantially anhydrous conditions a lower alkyl ether with carbon monoxide in the presence of a zeolite catalyst having an 8-member ring channel which is interconnected with a channel defined by a ring with greater than or equal to 8 members, the 8-member ring having a window size of at least 2.5 Angstroms×at least 3.6 Angstroms and at least one Brønsted acid site and the zeolite having a silica:X2O3 ratio of at least 5, wherein X is selected from aluminum, boron, iron, gallium and mixtures thereof.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: December 16, 2008
    Assignees: BP Chemicals Ltd., The Regents of the University of California
    Inventors: Patricia Cheung, Enrique Iglesia, John Glenn Sunley, David John Law, Aditya Bhan
  • Patent number: 7309798
    Abstract: A product comprising a lower alkyl ester of a lower aliphatic carboxylic acid is produced by a process comprising reacting a lower alkyl ether with carbon monoxide in the presence of a catalyst comprising mordenite and/or ferrierite, optionally including an additional framework metal such as gallium, boron and/or iron, under substantially anhydrous conditions. More specifically, methyl acetate is selectively produced by reaction of dimethyl ether with carbon monoxide in the presence of a catalyst comprising mordenite or ferrierite, under substantially anhydrous conditions.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: December 18, 2007
    Assignees: The Regents of the University of California, BP Chemicals Limited
    Inventors: Patricia Cheung, Enrique Iglesia, John Glenn Sunley, Aditya Bhan, David John Law
  • Publication number: 20070238897
    Abstract: A product comprising a lower alkyl ester of a lower aliphatic carboxylic acid is produced by a process comprising reacting under substantially anhydrous conditions a lower alkyl ether with carbon monoxide in the presence of a zeolite catalyst having an 8-member ring channel which is interconnected with a channel defined by a ring with greater than or equal to 8 members, the 8-member ring having a window size of at least 2.5 Angstroms×at least 3.6 Angstroms and at least one Brønsted acid site and the zeolite having a silica:X2O3 ratio of at least 5, wherein X is selected from aluminum, boron, iron, gallium and mixtures thereof.
    Type: Application
    Filed: December 15, 2006
    Publication date: October 11, 2007
    Applicants: The Regents of the University of California, BP Chemicals Ltd.
    Inventors: Patricia Cheung, Enrique Iglesia, John Sunley, David Law, Aditya Bhan
  • Publication number: 20060287551
    Abstract: A product comprising a lower alkyl ester of a lower aliphatic carboxylic acid is produced by a process comprising reacting a lower alkyl ether with carbon monoxide in the presence of a catalyst comprising mordenite and/or ferrierite, optionally including an additional framework metal such as gallium, boron and/or iron, under substantially anhydrous conditions. More specifically, methyl acetate is selectively produced by reaction of dimethyl ether with carbon monoxide in the presence of a catalyst comprising mordenite or ferrierite, under substantially anhydrous conditions.
    Type: Application
    Filed: May 3, 2006
    Publication date: December 21, 2006
    Applicants: The Regents of the University of California, BP Chemichal Limited
    Inventors: Patricia Cheung, Enrique Iglesia, John Sunley, Aditya Bhan, David Law
  • Publication number: 20060252959
    Abstract: A product comprising a lower alkyl ester of a lower aliphatic carboxylic acid is produced by a process comprising reacting a lower alkyl ether with carbon monoxide in the presence of a catalyst comprising mordenite and/or ferrierite, under substantially anhydrous conditions. More specifically, methyl acetate is selectively produced by reaction of dimethyl ether with carbon monoxide in the presence of a catalyst comprising mordenite or ferrierite, under substantially anhydrous conditions.
    Type: Application
    Filed: May 5, 2005
    Publication date: November 9, 2006
    Applicants: The Regents of the University of California, BP Chemicals Limited
    Inventors: Patricia Cheung, Enrique Iglesia, John Sunley