Patents by Inventor Allan C. Kelly

Allan C. Kelly 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).

  • Purification of bayer process liquors
    Patent number: 4443416
    Abstract: Sodium oxalate impurity is removed from oxalate-enriched Bayer process caustic liquor by gradual increase of the caustic concentration of the liquor, thus providing a staged precipitation of the sodium oxalate in a well-crystallized and readily filterable form.
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: April 17, 1984
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventors: Donald J. Donaldson, Allan C. Kelly, Joseph W. Mulloy, Donald R. Zwakenberg
  • Bayer process production of alumina
    Patent number: 4036931
    Abstract: A process is provided which allows control of the impurity level of Bayer process streams with simultaneous generation of an environmentally acceptable effluent and recovery of valuable dissolved aluminum and sodium values. The process involves carbonation of a blow-down stream at 40.degree.-100.degree. C to produce sodium dawsonite [NaAl(OH).sub.2 CO.sub.2 ] and an effluent essentially free of dissolved alumina and significantly depleted in dissolved sodium. The sodium dawsonite can be used as such or returned to the Bayer process after thermal decomposition to sodium aluminate. The effluent can be directly discharged into natural receiving bodies without further treatment.
    Type: Grant
    Filed: June 25, 1976
    Date of Patent: July 19, 1977
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventors: Morris L. Roberson, John W. Beck, Jack S. Maples, Anthony Savariste, Donald J. Donaldson, David L. Stein, Allan C. Kelly