Patents by Inventor David P. Brochu

David P. Brochu 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).

  • Process for purifying phosphoric acid
    Patent number: 4780295
    Abstract: The invention is a process to purify a solution of phosphoric acid by removing transition metal impurities such as iron, chromium and vanadium. In the process a solution of phosphoric acid in an organic solvent which is substantially immiscible with water is contacted with an aqueous solution of a salt of an alkali metal of phosphoric acid. The phosphoric acid recovered following the contacting contains a substantially lesser content of transition metal impurities.
    Type: Grant
    Filed: July 6, 1987
    Date of Patent: October 25, 1988
    Assignee: FMC Corporation
    Inventors: Jeffrey C. Dore, David P. Brochu, Richard E. Hall
  • Process for preparing alkali metal phosphate
    Patent number: 4751066
    Abstract: Alkali metal phosphates are recovered from a water immiscible solvent solution of aqueous wet process phosphoric acid by neutralizing the acid with a basic alkali metal salt in a ratio of alkali metal to phosphorus of 1 to 3.5 to form at least the mono alkali metal phosphate. The solvent is given a water wash to recover entrained alkali metal phosphates. The resulting aqueous solution aforesaid and wash liquor containing the alkali metal salts are separated from the stripped solvent.
    Type: Grant
    Filed: May 8, 1986
    Date of Patent: June 14, 1988
    Assignee: FMC Corporation
    Inventors: Richard E. Hall, David P. Brochu