Patents by Inventor Richard V. C. Carr

Richard V. C. Carr 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).

  • Removal of nitrocresols from dinitrotoluene waste streams using fentons reagent
    Patent number: 4604214
    Abstract: This invention relates to a process for removing trinitrocresols and picric acid contaminants from a wastewater stream generated in the production of nitroaromatics, particularly dinitrotoluene, by the mixed acid technique. The process involves contacting the crude dinitrotoluene generated by the mixed acid technique with an alkaline medium to generate an alkaline wash water containing water soluble nitrocresols and picric acid therein. This wastewater then, is separated from the organic component or may be recycled for contact with further quantities of crude dinitrotoluene product from the reactor. When the concentration of the water soluble salts of trinitrocresols and picric acid is of sufficient concentration, the wash water is treated with aqueous acid in sufficient proportion to reduce the pH to a level from 3-4.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: August 5, 1986
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Richard V. C. Carr, Carl J. Martin, Roland Gonzalez, Thomas A. Albanese
  • Precipitative removal of nitrocresols from dinitrotoluene waste streams
    Patent number: 4597875
    Abstract: This invention relates to a process for removing nitrocresols and picric acid contaminants from a wastewater stream generated in the production of nitroaromatics, particularly dinitrotoluene, by the mixed acid technique. The process involves contacting the crude dinitrotoluene generated by the mixed acid technique with an alkaline medium to generate an alkaline wash water containing water soluble nitrocresols and picric acid therein. This wastewater is separated from the organic component and recycled for contact with further quantities of crude dinitrotoluene product from the reactor. When the concentration of the water soluble salts of nitrocresols and picric acid is of sufficient concentration the wash water is treated with aqueous acid in sufficient proportion to convert the water soluble salts to water insoluble organics. After treatment with acid, the organic material is separated from the wastewater and the organics incinerated.
    Type: Grant
    Filed: May 7, 1985
    Date of Patent: July 1, 1986
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Richard V. C. Carr, John E. Sawicki, Bernard A. Toseland
  • Nitric acid recovery by the adiabatic nitration of nitroaromatics with fortified spent acid
    Patent number: 4496782
    Abstract: A method is provided for denitrifying the aqueous spent acid of mononitration. The nitric acid in the aqueous spent acid is recovered by adiabatically reacting greater than a stoichiometric amount of a mononitroaromatic hydrocarbon with the aqueous spent acid which has been fortified to a nitric acid concentration of at least about 2 wt %. The denitrification method is useful in treating the aqueous spent acid phase from the mononitration stage of a dinitrotoluene process.
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: January 29, 1985
    Assignee: Air Products and Chemicals, Inc.
    Inventor: Richard V. C. Carr