Chemical process
US5728853A · kind A · utility
1Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1996 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Jul 11, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for extracting metal values, especially zinc values, from aqueous solutions of metal salts, which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula, ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents an optionally substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom from a 5- to 8-membered heterocyclic ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.