Patents Assigned to UNC Reclamation
  • Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions
    Patent number: 4956154
    Abstract: Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively separate chromium, nickel, cobalt, copper and lead cations from the aqueous solution. Typical extraction techniques include liquid-liquid extraction employing either mixer settlers or columns, liquid membrane extraction and selective supported membrane extraction.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: September 11, 1990
    Assignee: UNC Reclamation
    Inventors: Alex Magdics, Donald B. Stain