Pretreatment of crude wet process phosphoric acid
US4369169A · kind A · utility
5Cited by
5References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1980 |
| Grant date | Jan 18, 1983 |
| Priority date | — |
| Expiry date | Jan 22, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/235
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Crude wet process phosphoric acid is pretreated, to ensure against impurity precipitation and objectionable coloration during the downstream processing, e.g., liquid-liquid extraction thereof, by first homogeneously admixing same with an impurity adsorbent, next mixing the liquid dispersion which results with a liquid suspension of a flocculating agent, maintaining the resulting admixture under nonshearing agitation until same separates into a flocculated phase and a liquid solution phase, and then separating therefrom the flocculated phase and a purified, product acid liquid solution phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.