Patents Examined by Robert L. Stol
  • Process for extracting heavy metal ions from aqueous solutions
    Patent number: 4503016
    Abstract: The disclosure relates to a process for liquid/liquid-extraction of heavy metal ions from acid aqueous solutions with the aid of water-insoluble dithiophosphoric acid diesters as extracting agents. More particularly, use is made of phosphoric acid solutions with a P.sub.2 O.sub.5 -content of from 3 to 80 weight %, the solutions being free from emulsion-forming organic contaminants or having previously been freed therefrom in known manner. The resulting aqueous phase is separated from the phase containing the dithiophosphoric acid diester.
    Type: Grant
    Filed: February 23, 1984
    Date of Patent: March 5, 1985
    Assignee: Hoechst Aktiengesellschaft
    Inventors: G/u/ nther Schimmel, Werner Krause, Reinhard Gradl