US4032613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of iron from aluminum nitrate
Assignee: United States Department of the Interior
•
Filing: 1975-12-09
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Granted: 1977-06-28
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Expires: 1995-12-09
Abstract
Abstract Iron is removed from concentrated aluminum nitrate solution by solvent extraction with tri-n-butyl phosphate.
Inventors
- 👤 Lawrence E. Schultze
- 👤 Donald J. Bauer
- 👤 Judith A. Eisele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:53
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/66; C01G; C01G49/00; C01G49/0009; C22; C22B; C22B21/00; C22B21/0015; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A process for removal of iron from a concentrated aqueous aluminum nitrate solution, containing about 50 to 56.8 weight percent of aluminum nitrate, consisting of contacting said solution with an extractant from the group consisting of tri-n-butyl phosphate and a solution of about 25 to 90 percent of tri-n-butyl phosphate in an inert diluent, the weight ratio of tri-n-butyl phosphate to aluminum nitrate being about 0.05:1 to about 1:1, whereby the iron is extracted into said extractant.
Claim 2
Dependent Claim
77 words
A process for removal of iron from a concentrated aqueous aluminum nitrate solution, containing about 50 to 56.8 weight percent of aluminum nitrate, consisting of contacting said solution with an extractant from the group consisting of tri-n-butyl phosphate and a solution of about 25 to 90 percent of tri-n-butyl phosphate in an inert diluent, the weight ratio of tri-n-butyl phosphate to aluminum nitrate being about 0.05:1 to about 1:1, whereby the iron is extracted into said extractant.
Claim 3
Dependent Claim
20 words
The process of claim 1 in which the aluminum nitrate solution is formed by melting crystals of hydrated aluminum nitrate.
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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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |