Integral water demineralizer system and method
US4648976A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1985 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Mar 7, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J47/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A water demineralizer system and method is provided in which at least three beds of resin particles are connected in series flow arrangement preferably within a single vessel for substantially removing metal ions such as calcium and magnesium from water feed by exchange with hydrogen ions. The raw feed water flows first through an upper cation resin bed, then through an intermediate anion resin bed, and then through a lower bed of mixed cation and anion resins, and preferably flows downwardly through the beds. After the resin beds become saturated with metal ions from the feed water, mainly by calcium and magnesium ions, the beds are regenerated by first backwashing with water, then chemically treating with acid and caustic solution, followed by bed rinsing, air mixing and backflushing with water prior to further use for demineralizing the feed water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.