Method of treating phosphoric acid to prevent crud formation during solvent extraction
US4207302A · kind A · utility
7Cited by
2References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1976 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Feb 10, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/234
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for pretreating phosphoric acid to prevent the formation of a mass of suspended solids (i.e., "crud") during solvent extraction of the acid is described. Prior to solvent extraction, the acid is contacted with a liquid hydrocarbon such as kerosene which collects the crud-forming agents. The mixture of liquid hydrocarbon and collected crud-forming agents is separated from the acid and the liquid hydrocarbon is regenerated for reuse in the first step of the method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.