Three component resin system and method for purifying aqueous solutions
AssigneeThe Graver Company
InventorsGeorge C. Flynn, Eli Salem, Robert Kunin
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Abstract
The present invention relates to a method for purifying aqueous solutions or condensate in a three component resin system comprising a mixed bed of a strongly basic anion exchange resin, a strongly acidic cation exchange resin and a weakly acidic cation exchange resin. According to the present method, aqueous solutions can be treated to remove metal ions and corrosion products along with ammonia and other volatile amines so that metal ion leakage is substantially reduced and the run length of the resin system is increased. A method for separating and isolating the resins of the three component system is also described.
Claims18
A method for removing impurities including ammonia and sodium ions from a liquid comprising the steps of:
- (a) preparing a bed of filter materials including a first layer of a weakly acidic cation exchange resin and a second layer of a mixture comprising a strongly acidic cation exchange resin and an anion exchange resin, said weakly acidic cation exchange resin having a pK.sub.a in the range of about 3.5 to 5.8 and
- (b) passing the liquid through said first layer and then said second layer of said bed at a temperature less than 200.degree. F. and at a flow rate of less than about 75 gallons per minute per square foot to substantially remove the impurities and purify the liquid.
A method for removing impurities including ammonia and sodium ions from a liquid comprising the steps of:
- (a) preparing a mixed bed of filter materials including an anion exchange resin, a first cation exchange resin and a second cation exchange resin which is an acrylic acid-containing copolymer and has a pK.sub.a in the range of about 4.0 to 5.8;
- and
- (b) passing the liquid through the bed at a temperature in the range of about 80.degree. F. to 190.degree. F. and at a flow rate in the range of about 25 to 50 gallons per minute per square foot to substantially remove the impurities and to purify the liquid.
Dependencies are inferred from the claim text.