Patents by Inventor Stephen Joseph Markovich

Stephen Joseph Markovich 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).

  • Patent number: 6084122
    Abstract: Broadly, the present invention is directed to a process for the removal of sulfur from an acrylate waste stream. In particular, disclosed is a process for the recovery and reuse of an acid catalyst employed primarily in the reaction of acrylic esters. During the reaction of acrylic acid and an alcohol in the presence of an acid catalyst, the product acrylate and water are removed from the remaining reaction by-products (heavy ends and oligomers). These by-product heavy end components which include the acid catalyst employed in the reaction process, are directed to an evaporator. The residue stream therefrom is then contacted with water in an extractor. Upon contact with water, a phase separation occurs between the acid catalyst/water mixture and other organic matter. The organic matter is discarded while the acid/water mixture is recycled to the reaction process.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: July 4, 2000
    Assignee: Celanese International Corporation
    Inventors: Martiniano Garza, Jr., Michael Joseph Barber, Stephen Joseph Markovich, Steven E. Parker, Hermelinda Pedraza, Carolyn Supplee