Method for reducing metal ion concentration in brine solution
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United States of America Patent
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Jul 30, 2002
Grant Date -
Aug 9, 2001
app pub date -
Aug 23, 1999
filing date -
Aug 23, 1999
priority date (Note) -
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Abstract
This invention relates to a method for removing impurities from a brine solution, the brine solution comprising a water soluble 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; 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.
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