Ion-exchange process for desalting water and subsequent regeneration of the ion exchangers
US4039442A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1976 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Apr 22, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Water to be desalted in an ion-exchange process is contacted with a first cation exchanger in the form of a monovalent cation, and a first anion exchanger. The resultant treated solution is then reacted with a second, weakly acidic cation exchanger in the form of a free acid and, in certain applications, with a second weakly basic anion exchanger in the form of a free base to complete the desalting portion of the process. The second ion exchangers are then regenerated with the use of desalted water at a temperature greater than 30.degree. C, and the products of such reaction (including a hydroxide of the monovalent cation) are employed to regenerate one or more of the remaining exhausted ion exchangers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.