Patents by Inventor James Dee Palmer

James Dee Palmer 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).

  • Separation of 2,4-toluenediamine from an isomeric mixture of toluenediamines
    Patent number: 6469212
    Abstract: A mixture comprised of about 60-85% of 2,4-toluenediamine (2,4-TDA) and about 15-40% of 2,6-toluenediamine (2,6-TDA) is melted, the temperature of the mixture is lowered to a 2,4-TDA nucleation temperature, and the temperature of the mixture is gradually reduced from the nucleation temperature to about 65 to about 70° C. The resultant mixture is in the form of a solids phase enriched in 2,4-TDA, and a novel and useful liquid phase enriched in 2,6-TDA. These phases are separated. Preferably the solids are further purified by “sweating” them and removing the sweated liquid impurities. The sweated liquid can be recycled together with another charge of a mixture comprised of 2,4-TDA and 2,6-TDA. 2,4-TDA can be produced with a purity of 96-99%.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: October 22, 2002
    Assignee: Albemarle Corporation
    Inventors: John C. Prindle, Jr., Michael W. Easson, James Dee Palmer, Jason G. Jones, Max K. Mortensen, James E. Boone