Patents by Inventor Doreen C. Keptner

Doreen C. Keptner 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).

  • Method for processing effluent from chloromethylation of vinyl aromatic polymers
    Patent number: 8163138
    Abstract: A method for processing effluent from a chloromethylation of a vinyl aromatic polymer wherein the effluent includes catalyst and volatile organics, and wherein the method includes the steps of: 1) deactivating at least a portion of the catalyst; 2) distilling the effluent; 3) adding caustic to the effluent; and 4) distilling the effluent.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: April 24, 2012
    Assignee: Dow Global Technologies LLC
    Inventors: William I. Harris, Bruce S. Holden, Doreen C. Keptner, David C. McDonald
  • Method for processing effluent from chloromethylation of vinyl aromatic polymers
    Publication number: 20080289949
    Abstract: A method for processing effluent from a chloromethylation of a vinyl aromatic polymer wherein the effluent comprises catalyst and volatile organics, and wherein the method comprising the steps of: 1) deactivating at least a portion of the catalyst; 2) distilling the effluent; 3) adding caustic to the effluent; and 4) distilling the effluent.
    Type: Application
    Filed: May 23, 2007
    Publication date: November 27, 2008
    Inventors: William I. Harris, Bruce S. Holden, Doreen C. Keptner, David C. McDonald