Patents by Inventor Jacques D. Hanotier

Jacques D. Hanotier 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 production and the recovery of terephthalic acid
    Patent number: 4357475
    Abstract: The reaction mixture obtained by oxidizing p-xylene in the presence of water as diluent, at a temperature comprised between 140.degree. and 220.degree. C., and consisting of terephthalic acid crystals in suspension in an aqueous solution comprising unreacted p-xylene, intermediate oxidation products thereof, the heavy-metal catalyst and water is introduced in the upper part of a sedimentation column wherein the acid is separated by gravity and is washed with a counter current of water introduced near the bottom of said column, the temperature of the washing zone being higher than the minimum value T.sub.w given by the equation T.sub.w =144+0.225 T.sub.R, wherein T.sub.R is the oxidation temperature.
    Type: Grant
    Filed: September 11, 1980
    Date of Patent: November 2, 1982
    Assignee: Labofina, S.A.
    Inventors: Jacques D. Hanotier, Jacques F. Dauby