US3195978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering potassium values from brines
Assignee: WR Grace and Co
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Filing: 1961-11-14
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Granted: 1965-07-20
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Expires: 1981-11-14
Abstract
No abstract record available.
Inventors
- 👤 Maria G Dunseth
- 👤 Murrell L Salutsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:06
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45; C01D; C01D7/00; C01D7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
METHOD OF RECOVERING POTASSIUM VALUES FROM BRINES WHICH COMPRISES ADDING TO SAID BRINE SUFFICIENT AMOUNTS OF PHOSPHATE (PO4**3) IONS TO PROVIDE A PO4/MG+CA MOLE RATIO OF AT LEAST 0.8, ADDING SUFFICIENT AMOUNTS OF AMMONIA-FREE SODIUM HYDROXIDE TO RAISE THE PH OF THE PHOSPHATE TREATED BRINE TO WITHIN THE RANGE OF FROM ABOUT 7.5 TO ABOUT 9.5 TO PRECIPITATE POTASSIUM-CONTAINING SOLIDS FROM SAID BRINE, AND SEPARATING THE PRECIPITATED SOLIDS FROM THE BRINE.
Claim 2
Dependent Claim
135 words
METHOD OF RECOVERING AN AQUEOUS SOLUTION OF A POTASSIUM SALT FROM BRINES WHICH COMPRISES ADDING PHOSPHATE IONS TO BRINE, RAISING THE PH OF THE PHOSPHATETREATED BRINE TO GREATER THAN ABOUT 7.5 WITH AN AMMONIAFREE BASE WHICH DOES NOT FORM A SALT LESS SOLUBLE THAN MAGNESIUM POTASSIUM PHOSPHATE UNDER THE CONDITIONS PREVAILING IN SAID BRINE TO PRECIPITATE POTASSIUM-CONTAINING SOLIDS FROM SAID BRINE, SEPARATING THE PRECIPITATED SOLIDS FROM THE BRINE, REACTING THE SEPARATED SOLIDS WITH AN AQUEOUS SOLUTION OF AN AMMONIUM SALT HAVING THE FORMULA NH4A, WHERE A IS ANY ANION WHICH WILL COMBINE WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF POTASSIUM AND AMMONIA IONS TO FORM A WATER-SOLUBLE SALT, FOR A SUFFICIENT PERIOD OF TIME TO AT LEAST PARTIALLY SOLUBILIZE THE POTASSIUM IN SAID SOLIDS, AND SEPARATING THE SOLUTION OF POTASSIUM SALT THEREBY PRODUCED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |