Process for removing solvent from the raffinate of extracted phosphoric acid and for preparing phosphate salts
US4132540A · kind A · utility
7Cited by
18References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 18, 1977 |
| Grant date | Jan 2, 1979 |
| Priority date | — |
| Expiry date | Jul 18, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05B7/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
When crude wet process phosphoric acid is solvent extracted, an aqueous raffinate containing phosphoric acid and a small amount of solvent is produced as a by-product. Certain materials are added to the raffinate, in order to produce two phases, one aqueous and the other of solvent. The phases are separated, the solvent recycled for reuse in a solvent extraction process and the aqueous phase treated with ammonia or alkali or alkaline earth metal compounds to form a fertilizer or other phosphate salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.