Separation and purification of salts in a non-convective solar pond
US4569676A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1984 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Aug 21, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D7/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Brine containing at least two salts, one or more of the salts having a higher hydrated form and a lower hydrated or anhydrous form, is fed to a non-convective solar pond and one of the salts having a higher hydrated form and a lower hydrated or anhydrous form is crystallized in a higher hydrated form, dehydrated to a lower hydrated form, and recovered from the bottom of the pond in solid, pure form essentially free from the other salts in the brine. To effect separation, the salt having a higher hydrated form and a lower hydrated or anhydrous form, which is to be recovered in pure form must be present in the pond in an essentially saturated concentration. The concentrations of any of the other salts must generally not exceed saturation concentration at the temperature in the top layer of the pond, and must not exceed saturation concentration at the conditions in the bottom layer of the pond. Concentrations of other salts in the pond must be controlled such that the required density gradient is maintained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.