Patents by Inventor Brenda J. Hook

Brenda J. Hook 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).

  • Selective recovery of a nitrophenolic by-product from nitration waste water by precipitation
    Patent number: 4986920
    Abstract: A process of selectively recovering a nitrophenolic by-product, namely 2,4-dinitrophenol and picric acid, from nitration waste water in substantially pure form through the control of the solution pH of the nitration waste water and subsequent precipitation is provided. By adjusting the solution pH of the nitration waste water with an acid to a pH in the range of from about 4.0 to 0.5, the solubility of the selected nitrophenolic by-products is affected and the crystal formation of the individual by-products controlled.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: January 22, 1991
    Assignee: First Chemical Corporation
    Inventors: Earl G. Adams, Arthur C. Bayer, Alan D. Farmer, Brenda J. Hook
  • Selective recovery of a nitrophenolic by-product from nitration waste water by extraction
    Patent number: 4986917
    Abstract: A process for selectively recovering a nitrophenolic by-product from nitration waste water in substantially pure form by solvent extraction is provided. The pH of the waste water is adjusted using an acid to affect the solubility of a particular nitrophenolic by-product in the waste water so that the by-product is selectively separable from the other components of the nitration waste water by solvent extraction.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: January 22, 1991
    Assignee: First Chemical Corporation
    Inventors: Earl G. Adams, Arthur C. Bayer, Alan D. Farmer, Brenda J. Hook