US3872212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of potassium ions from sodium ions using alkanolamines
Assignee: Union Carbide Corp
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Filing: 1973-05-31
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Granted: 1975-03-18
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Expires: 1993-05-31
Abstract
Abstract Potassium ions can be separated from sodium ions in aqueous solution by contact with alkanolamine solutions containing stoichiometric amounts of sulfate ions.
Inventors
- 👤 Gilbert R Atwood
- 👤 Robert J Blake
- 👤 Kenneth F Butwell
- 👤 David A Dunnery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:51
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/02; C01D5/16; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25125
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A METHOD FOR THE SEPARATION OF POTASSIUM CATIONS FROM SODIUM CATIONS IN AN AQUEOUS SOLUTION OF POTASSIUM SULFATE AND SODIUM SULFATE RANGING FROM ABOUT 2 TO ABOUT 25% SALTS BY WEIGHT WHICH COMPRISES: A. MIXING THE AQUEOUS SOLUTION OF POTASSIUM AND SODIUM SULFATES WITH FROM 0.05 TO 100 PARTS BY WEIGHT PER PART OF SAID SOLUTION OF AN ALKANOLAMINE HAVING 1 TO 4 ALKANOL MOIETIES AND 2 TO 6 CARBON ATOMS IN EACH MOIETY WHEREBY MORE THAN 75% BY WEIGHT OF THE POSTASSIUM SALT PRECIPITATES OUT OF SOLUTION AS CRYSTALLINE POTASSIUM SULFATE; B. ISOLATING THE PRECIPITATED POTASSIUM SULFATE FROM THE MIXTURE OF (A); C. REMOVING WATER FROM THE MIXTURE REMAINING IN (B) AFTER ISOLATION OF PRECIPITATED POTASSIUM SULFATE UNTIL THE REMAINING SALTS PRECIPITATE OUT OF SOLUTION; AND D. ISOLATING THE PRECIPITATED SALTS OF (C).
Claim 2
Independent Claim
134 words
A METHOD FOR THE SEPARATION OF POTASSIUM CATIONS FROM SODIUM CATIONS IN AN AQUEOUS SOLUTION OF POTASSIUM SULFATE AND SODIUM SULFATE RANGING FROM ABOUT 2 TO ABOUT 25% SALTS BY WEIGHT WHICH COMPRISES: A. MIXING THE AQUEOUS SOLUTION OF POTASSIUM AND SODIUM SULFATES WITH FROM 0.05 TO 100 PARTS BY WEIGHT PER PART OF SAID SOLUTION OF AN ALKANOLAMINE HAVING 1 TO 4 ALKANOL MOIETIES AND 2 TO 6 CARBON ATOMS IN EACH MOIETY WHEREBY MORE THAN 75% BY WEIGHT OF THE POSTASSIUM SALT PRECIPITATES OUT OF SOLUTION AS CRYSTALLINE POTASSIUM SULFATE; B. ISOLATING THE PRECIPITATED POTASSIUM SULFATE FROM THE MIXTURE OF (A); C. REMOVING WATER FROM THE MIXTURE REMAINING IN (B) AFTER ISOLATION OF PRECIPITATED POTASSIUM SULFATE UNTIL THE REMAINING SALTS PRECIPITATE OUT OF SOLUTION; AND D. ISOLATING THE PRECIPITATED SALTS OF (C).
Claim 3
Dependent Claim
14 words
Method claimed in claim 1 wherein the upper limit of alkanolamine is 10 parts.
Claim 4
Dependent Claim
11 words
Method claimed in claim 2 wherein the alkanolamine is a trialkanolamine.
Claim 5
Dependent Claim
10 words
Method claimed in claim 3 wherein the trialkanolamine is triethanolamine.
Claim 6
Dependent Claim
12 words
Method claimed in claim 2 wherein the alkanolamine is a tetraalkanol alkylenediamine.
Claim 7
Dependent Claim
12 words
Method claimed in claim 5 wherein the tetraalkanol alkylenediamine is tetrahydroxyethyl ethylenediamine.
Claim 8
Dependent Claim
11 words
Method claimed in claim 2 wherein the alkanolamine is a dialkanolamine.
Claim 9
Dependent Claim
11 words
Method claimed in claim 2 wherein the alkanolamine is a monoalkanolamine.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |