Patents by Inventor Mark Shedrick Simpson

Mark Shedrick Simpson 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).

  • Dilute acid oxidation of dinitrotoluene alkaline wash water
    Patent number: 5762802
    Abstract: A process for removing nitrocresols in a crude aqueous alkaline dinitrotoluene wash stream derived by nitration of toluene using a mixed acid technique followed by treatment with aqueous alkaline material in which the crude aqueous alkaline dinitrotoluene wash stream is mixed with a dilute oxidizing acid such as nitric acid, heated to 130.degree. to 180.degree. C. for a period of time required to reduce the nitrocresols to a level at which it does not precipitate from the mixed acidic wash stream at temperatures above about 60.degree. C., and removing the remaining nitrocresols by conventional methods such as adsorption or activated sludge biotreatment.
    Type: Grant
    Filed: May 1, 1997
    Date of Patent: June 9, 1998
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Richard Van Court Carr, Mark Shedrick Simpson