Ion exchange methods for treating water hardness
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United States of America Patent
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Aug 15, 2017
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Oct 4, 2013
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Oct 4, 2012
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Abstract
The present invention includes a novel salt-free water softening method that utilizes an exchange medium (such as a gel exchange polymer, a macroporous exchange polymer, or an inorganic cation exchanger) that is pre-loaded with a polyvalent cation that has low solubility in aqueous phase at nearly neutral pH. The method of the invention does not require use of a sodium salt or mineral acid in the regeneration of the exchange medium.
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