Patents by Inventor Howard L. Mitchell

Howard L. Mitchell 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).

  • Organic salt compositions in extraction processes
    Patent number: 4440634
    Abstract: Novel solid salt compositions are described containing, for example, tetraaryl and triarylaralkyl phosphonium and arsonium cations and tetraaryl and tetraaryloxy-boronates and aluminates and polyanionic metal oxide surfaces, for example, as anions. The salts are useful for extracting aromatics and olefins from paraffinic hydrocarbon and aqueous liquid feedstreams and from vapor and gas feedstreams by absorption.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: April 3, 1984
    Assignee: Exxon Research and Engineering Co.
    Inventor: Howard L. Mitchell
  • Organic salt compositions in extraction processes
    Patent number: 4422975
    Abstract: Novel solid salt compositions are described containing, for example, tetraaryl- and triarylaralkyl-phosphonium and arsonium cations and tetraaryl- and tetraaryloxy-boranates and aluminates and polyanionic metal oxide surfaces, for example, as anions. The salts are useful for extracting aromatics and olefins from paraffinic hydrocarbon and aqueous liquid feedstreams, and from vapor and gas feedstreams by absorption.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: December 27, 1983
    Assignee: Exxon Research and Engineering Co.
    Inventor: Howard L. Mitchell
  • Liquid salt extraction of aromatics from process feed streams
    Patent number: 4359596
    Abstract: Liquid salts such as quaternary phosphonium and ammonium salts of halides, acids, or more complex anions can be utilized to extract aromatics from mixed aliphatic/aromatic hydrocarbon feeds such as isomerization process feed streams, cat naphthas, lube stocks, and the like. Such salts show the required solubilities in various solvents to exhibit a distinct selectivity advantage over more commonly used extraction solvents such as sulfolane in the extraction of benzene and other aromatics from heptane and other aliphatic feedstreams.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: November 16, 1982
    Assignee: Exxon Research and Engineering Co.
    Inventors: Kent A. Howard, Howard L. Mitchell, Robert H. Waghorne