Process to prepare salt
US8038883B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2006 |
| Grant date | Oct 18, 2011 |
| Priority date | — |
| Expiry date | May 24, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D3/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to a process to prepare salt comprising the following steps: (i) preparing an aqueous salt solution containing at least 100 g/l of sodium chloride and at least 0.01 ppm of polyvalent cations by dissolving a sodium chloride source in industrial water, (ii) adding an effective amount of at least one positive retention enhancing component to the aqueous salt solution, (iii) subsequently subjecting the solution to a nanofiltration step, thereby separating the solution into a retentate which is enriched for the polyvalent cations and a permeate which is the purified aqueous salt solution, and (iv) concentrating the permeate to produce salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.