Patents by Inventor William V. Phillips

William V. Phillips 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 purification of terephthalic acid
    Patent number: 4605763
    Abstract: The present invention provides an improved process for the purification of crude terephthalic acid which has been produced by the oxidation of para-xylene. The process comprises contacting the crude terephthalic acid with oxygen-containing gas at a temperature of about 190.degree. to 230.degree. C. and a pressure of about 1500 to 3600 kPa in the presence of a solvent comprising an alkanoic acid which is preferably acetic acid. The process further comprises the use of a novel and surprisingly effective catalyst system. The catalyst system comprises cobalt, a bromine source, and pyridine.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: August 12, 1986
    Assignee: Eastman Kodak Company
    Inventors: Judy E. Kiefer, William V. Phillips, Thomas E. Woodruff