Patent US2902344A successfully refreshed from Google Patents.
US2902344A
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Process for the preparation of hydrous potassium magnesium sulfate and potassium sulfate from kainite containing sodium chloride
Assignee: SINCAT INDUSTRIALE CATANESE SpA Soc
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Filing: 1957-03-06
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Granted: 1959-09-01
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Expires: 1977-03-06
Abstract
No abstract record available.
Inventors
- 👤 Cevidalli Guidobaldo
- 👤 Marchi Fulvio
- 👤 Saccardo Pietro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:41
CPC Classifications
C; C01; C01F; C01F5/00; C01D; C01D5/00; C01D5/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A PROCESS FOR THE CONVERSION OF NATURAL KAINITE CONTAINING SODIUM CHLORIDE AS AN IMPURITY INTO POTASSIUM SULFATE AND MAGNESIUM-POTASSIUM SULFATE INVOLVING THE STEPS OF: (1) DECOMPOSING THE KAINITE BY CONTACT WITH AN AQUEOUS MEDIUM IN ABOUT THE STOICHIOMETRIC QUANTITY FOR DISSOLVING ALL THE RESULTING MAGNESIUM CHLORIDE; AND (2) THEN SEPARATING THE RESULTING MAGNESIUMPOTASSIUM SULFATE SUSPENDED IN SAID MEDIUM FROM UNDISSOLVED SODIUM CHLORIDE CRYSTALS, THE IMPROVEMENT WHICH COMPRISES CONTACTING RECOVERED MAGNESIUM-POTASSIUM SULFATE WITH WATER, THEREBY FORMING A SUSPENSION OF POTASSIUM SULFATE IN A MAGNESIUM SULFATE MOTHER LIQUOR, RECOVERING THE SUSPENDED POTASSIUM SULFATE, AND EMPLOYING THE MOTHER LIQUOR REMAINING AS THE AQUEOUS MEDIUM FOR DECOMPOSING THE KAINITE.
Claim 2
Dependent Claim
106 words
IN A PROCESS FOR THE CONVERSION OF NATURAL KAINITE CONTAINING SODIUM CHLORIDE AS AN IMPURITY INTO POTASSIUM SULFATE AND MAGNESIUM-POTASSIUM SULFATE INVOLVING THE STEPS OF: (1) DECOMPOSING THE KAINITE BY CONTACT WITH AN AQUEOUS MEDIUM IN ABOUT THE STOICHIOMETRIC QUANTITY FOR DISSOLVING ALL THE RESULTING MAGNESIUM CHLORIDE; AND (2) THEN SEPARATING THE RESULTING MAGNESIUMPOTASSIUM SULFATE SUSPENDED IN SAID MEDIUM FROM UNDISSOLVED SODIUM CHLORIDE CRYSTALS, THE IMPROVEMENT WHICH COMPRISES CONTACTING RECOVERED MAGNESIUM-POTASSIUM SULFATE WITH WATER, THEREBY FORMING A SUSPENSION OF POTASSIUM SULFATE IN A MAGNESIUM SULFATE MOTHER LIQUOR, RECOVERING THE SUSPENDED POTASSIUM SULFATE, AND EMPLOYING THE MOTHER LIQUOR REMAINING AS THE AQUEOUS MEDIUM FOR DECOMPOSING THE KAINITE.
References Cited (Backward Citations)
US229249A
Cited
US1244884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |