Patents Assigned to Phosphate Engineering & Construction Co., Inc.
  • Production of monobasic potassium phosphate with low chloride content from potassium chloride and phosphoric acid produced from the commercial wet process
    Patent number: 4885148
    Abstract: Relatively pure monopotassium phosphate is produced from wet process phosphoric acid in a process wherein the phosphoric acid is mixed with potassium chloride and recycled components from downstream product and by-product recovery steps and heated to permit hydrogen and chloride to evolve from the melt as gases and wherein the melt is subsequently treated so as to remove impurities so that the monopotassium phosphate may be recovered as a relatively pure crystalline product with low chloride content.
    Type: Grant
    Filed: September 6, 1988
    Date of Patent: December 5, 1989
    Assignee: Phosphate Engineering & Construction Co., Inc.
    Inventors: William R. Erickson, Donald B. Stain, James D. Wilson
  • Removal of cationic impurities from inorganic solutions
    Patent number: 4861490
    Abstract: A process for the removal of cationic impurities from inorganic solutions and especially wet process phosphoric acid solutions wherein the solutions are passed through an ammonium ion or hydrogen ion charged cation exchange resin to remove various metal cations and thereafter the ion exchange resin is regenerated using an excess volume of ammonium sulfate solution which is subsequently treated to precipitate and filter out the cationic impurities so that the ammonium sulfate solution may be recycled for further ion exchange regeneration.
    Type: Grant
    Filed: August 21, 1987
    Date of Patent: August 29, 1989
    Assignee: Phosphate Engineering & Construction Co., Inc.
    Inventor: Susan B. Morris