Retarding agents for preparing purified brine
US7186394B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2002 |
| Grant date | Mar 6, 2007 |
| Priority date | — |
| Expiry date | Jul 10, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D3/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a process to produce brine of improved purity wherein a salt source, contaminated with sulphate ions and alkaline (earth) metal ions, is dissolved in water in the presence of an effective amount of a retarding agent comprising at least one low and at least one high molecular weight retarding agent. Said retarding agent effectively reduces the level of the alkaline (earth) metal sulphate dissolved in the brine, particularly the amount of calcium and sulphate. Preferably, the combination of the low and high molecular weight retarding agents is synergetic in the reduction of dissolved alkaline-earth metal sulphate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.