Process for producing fully desalted process water
US4321144A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | May 2, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J39/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Process for producing fully desalted process water by the treatment of raw water with cation and anion exchangers in a separate multi-stage arrangement. The water which leaves the main cation exchanger stage or stages, has a residual sodium content of less than 0.5 mg Na/l before entering the anion exchange stage. Such water is fed through a strong acid cation exchanger stage, in which the exchanger material is present at a maximum of 50 percent as a suspended bed and the remainder as a solid bed. The exchanger material in the strong acid cation exchanger stage following the first strong acid cation exchanger stage, is present at a maximum of 25 percent as a suspended bed and the remainder as a solid bed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.