Metal extraction process
Abstract
Abstract A NOVEL PROCESS FOR STRIPPING METAL CATIONS FROM AN ORGANIC EXTRACT CONTAINING SUCH IONS IN ASSOCIATION WITH ANIONS OF AN ORGANIC ACID EXTRACTANT FOR METAL CATIONS AND HAVING IN ADMIXTURE THEREWITH A SUBSTANTIALLY AQUEOUS INSOLUBLE AMINE WHEREIN THE PH OF THE EXTRACT BEFORE CARRYING OUT THE STRIPPING OPERATION IS SUCH THAT THE AMINE IS IN ITS FREE BASE FORM. THE METAL IONS ARE STRIPPED FROM THE EXTRACT WITH WEAKER ACIDS THAN ARE CONVENTIONALLY USED BY CONTACTING THE EXTRACT WITH AN ACIDIC SYSTEM OF AN ACIDITY SUCH THAT THE AMINE IS CONVERTED TO ITS PROTONATED FORM, I.E. TO A SUBSTITUTED AMMONIUM ION, WHEREUPON THE METAL IONS ARE EJECTED FROM THE ORGANIC EXTRACT INTO THE STRIPPING MEDIA BY THE RESULTING SUBSTITUTED AMMONIUM IONS.
Inventors
- 👤 Robert R Grinstead
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |