Ion exchange regeneration method
US8177981B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2003 |
| Grant date | May 15, 2012 |
| Priority date | — |
| Expiry date | Apr 5, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved process for regenerating ion exchange resin, includes a regeneration step of displacing captured ions from the resin to regenerate its ion-capture functionality, followed by one or more fluid-employing post-regeneration steps such as a fluid displacement or rinse, a fluid transport or mixing, and a rinse down to quality. To avoid problems of early leakage of weakly held ions such as boron, the post-chemical or postdisplacement steps use water that is essentially free of boron, or otherwise avoid localized contamination in the regenerated resin which is used in bottles or beds (30). A two-stage polish may be operated with modified lead/lag bottles. A detector (D) for an indicator condition (conductivity, silica breakthrough) between stages determines when to shift the lag bottle forward, and periodically both bottles are replaced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.