Method for purifying phosphoric acid
US3970741A · kind A · utility
8Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Jan 31, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/234
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for purifying phosphoric acid obtained with sulfuric acid acting on natural phosphates, comprises extracting the phosphoric acid with a mixed solvent formed essentially by 95% to 50% by volume of an ether containing 5 to 7 carbon atoms, and by 5% to 50% by volume of at least one of the esters resulting from the reaction of the phosphoric acid with alcohols having 3 to 5 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.