Patent US3310374A successfully refreshed from Google Patents.
US3310374A
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US
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Process for removing iron from phosphoric acid
Assignee: Dow Chemical Co
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Filing: 1962-12-06
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Granted: 1967-03-21
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Expires: 1982-12-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Bob Posey
- 👤 Jr Ted E Varnado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:19
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/237; C01B25/238; C01B25/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD FOR REMOVING IRON FROM AN AQUEOUS PHOSPHORIC ACID SOLUTION CONTAINING IRON WHICH CONSISTS ESSENTIALLY OF: (1) TREATING SAID SOLUTION WITH A SUFFICIENT AMOUNT OF AN OXIDIZING AGENT TO CONVERT SUBSTANTIALLY ALL THE IRON PRESENT TO FEIII; (2) ADDING SUFFICIENT CHLORIDE TO PROVIDE IN THE AQUEOUS SOLUTION A MOLE RATIO OF HCL TO FEIII OF AT LEAST FOUR; AND (3) EXTRACTING FEIII FROM THE SOLUTION, WITH AN AMINE EXTRACTANT CONSISTING ESSENTIALLY OF: (A) AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF WATER-INSOLUBLE ORGANIC AMINES AND INORGANIC SALTS THEREOF, SAID AMINES HAVING THE STRUCTURE:
Claim 2
Independent Claim
95 words
A METHOD FOR REMOVING IRON FROM AN AQUEOUS PHOSPHORIC ACID SOLUTION CONTAINING IRON WHICH CONSISTS ESSENTIALLY OF: (1) TREATING SAID SOLUTION WITH A SUFFICIENT AMOUNT OF AN OXIDIZING AGENT TO CONVERT SUBSTANTIALLY ALL THE IRON PRESENT TO FEIII; (2) ADDING SUFFICIENT CHLORIDE TO PROVIDE IN THE AQUEOUS SOLUTION A MOLE RATIO OF HCL TO FEIII OF AT LEAST FOUR; AND (3) EXTRACTING FEIII FROM THE SOLUTION, WITH AN AMINE EXTRACTANT CONSISTING ESSENTIALLY OF: (A) AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF WATER-INSOLUBLE ORGANIC AMINES AND INORGANIC SALTS THEREOF, SAID AMINES HAVING THE STRUCTURE:
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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) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |