Ion exchange methods for treating water hardness
US9731983B2 · kind B2 · utility
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2References
27Claims
0Family size
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Key dates
| Filing date | Oct 4, 2013 |
| Grant date | Aug 15, 2017 |
| Priority date | — |
| Expiry date | May 8, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2303/16
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.