US3374055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of phosphoric acid and the purification thereof
Assignee: CIE DES GELATINES FRANCAISES
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Filing: 1963-09-24
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Granted: 1968-03-19
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Expires: 1983-09-24
Abstract
No abstract record available.
Inventors
- 👤 Villalon Ernest Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:06
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/185; C01B25/234
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS COMPRISING THE STEPS OF: TREATING A CHARGE CONTAINING TRI-CALCIUM PHOSPHATE WITH AN AQUEOUS SOLUTION OF PHOSPHORIC ACID AT A CONCENTRATION OF ABOUT 80150 G./L. AND AT NOT GREATER THAN ABOUT 20*C. TO OBTAIN A SOLUTION OF MONO-CALCIUM PHOSPHATE; PASSING A FIRST PORTION OF SAID RESULTING AQUEOUS SOLUTION OF MONO-CALCIUM PHOSPHATE OVER A FIRST STRONGLY ACIDIC CATION-EXCHANGE RESIN IN THE ACID FORM TO RECOVER THE QUANTITY OF PHOSPHORIC ACID NECESSARY FOR SAID TREATMENT OF TRI-CALCIUM PHOSPHATE; RECYCLING SAID RECOVERED PHOSPHORIC ACID TO SAID TRI-CALCIUM PHOSPHATE TREATMENT; PASSING THE SECOND PORTION OF SAID AQUEOUS SOLUTION OF MONO-CALCIUM PHOSPHATE OVER A SECOND STRONGLY ACIDIC CATION-EXCHANGE RESIN REGENERATED IN A SODIUM CYCLE; AND RECOVERING FROM SAID SECOND RESIN A SOLUTION OF ALKALINE MONO-SODIUM PHOSPHATE.
Claim 2
Dependent Claim
76 words
A PROCESS COMPRISING THE STEPS OF: TREATING TRICALCIUM PHOSPHATE WITH PHOSPHORIC ACID AT A CONCENTRATION OF ABOUT 80-150 G./1 AND AT NOT GREATER THAN ABOUT 20*C.; TREATING THE RESULTING AQUEOUS SOLUTION OF MONO-CALCIUM PHOSPHATE WITH SULPHURIC ACID TO PRECIPITATE THE MAJOR PORTION OF CA++ AS CASO4; PURIFYING THE RESULTANT SOLUTION BY REMOVING THE CALCIUM SULPHATE WHICH HAS PRECIPITATED; AND PASSING THE RESULTING AQUEOUS SOLUTION OVER A STRONGLY ACIDIC CATION-EXCHANGE RESIN, WHEREBY PURE PHOSPHORIC ACID IS RECOVERED.
References Cited (Backward Citations)
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Cited
US1504340A
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US2567227A
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GB760524A
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US2914380A
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US3055735A
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US3192013A
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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) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |