Patent ID: 6426008
Filing Date: 2002-07-30
Classification: C01D

Abstract:
A method for removing impurities from a brine solution comprising trivalent metal cations and alkaline earth metal cations, the brine solution further comprising a water soluble metal chelating agent, the method comprising the steps of:a) adjusting the pH of the brine solution to a pH of from about 2 to about 4; b) passing the brine solution through a first functionalized resin; the first functionalized resin having functional groups capable of removing multivalent metal cations from the brine solution, thereby reducing the concentration of trivalent metal cations in the brine solution; c) adjusting the pH of the brine solution to a pH of from about 9 to about 11.5; and d) passing the brine solution through a second functionalized resin; the second functionalized resin having functional groups capable of removing alkaline earth metal cations from the brine solution, thereby reducing the concentration of alkaline earth metal cations in the brine solution.