Patents by Inventor John J. Evangelista

John J. Evangelista 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).

  • Phthalic acid diester preparation with waste stream purification and recycle
    Patent number: 4241216
    Abstract: A continuous process for the preparation in at least one esterification reactor of phthalate diesters utilizing phthalic acid or anhydride and a stoichiometric excess of at least one saturated aliphatic alcohol containing about 4 to about 10 carbon atoms comprises (a) reaction of phthalic acid or anhydride with said alcohol in a reactor zone, (b) purification of the diester in a purification zone in which the reaction product is neutralized with an alkali metal hydroxide, i.e., sodium hydroxide, to separate the diester and the unreacted phthalic acid or anhydride together with said saturated alcohol utilized in the reaction, said reaction product is separated into an organic phase and an aqueous waste phase.
    Type: Grant
    Filed: January 2, 1979
    Date of Patent: December 23, 1980
    Assignee: BASF Wyandotte Corporation
    Inventors: Lee H. Bergman, John J. Evangelista, William M. Herring