US3905903A
Expired / Lapsed
US
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Method of purification of cation regenerant solution
Assignee: Aerojet Rocketdyne Inc
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Filing: 1975-01-24
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Granted: 1975-09-16
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Expires: 1995-01-24
Abstract
Abstract A solution of cation regenerant containing a complex of cation regenerant and anion regenerant is separated and purified by passage through a modified chromatographic media exhibiting a retarding effect on the cation regenerant or the complex. A solution of cation regenerant at a concentration of at least one normal and preferably 2 to 3 normal is passed through a column of solid, insoluble chromatographic media having a pK in the range of 9-10. This procedure does not require organic solvent elution and wash requirement is low giving a final eluate of minimum volume.
Inventors
- 👤 Ernest J David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
B; B01; B01J; B01J49/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
A METHOD OF SEPARATING AN ION-EXCHANGE REGENERANT FROM A SOLUTION CONTAINING A COMPLEX OF SAID REGENERANT WITH A COUNTER-ION REGENERANT COMPRISING THE STEPS OF: PASSING SAID SOLUTION THROUGH A CHROMATOGRAPHIC MEDIA CAPABLE OF RESOLVING SAID REGENERANT FROM THE COMPLEX, PASSING ELUANT THROUGH THE MEDIA TO FROM A REGENERANT CUT AND A COMPLEX CUT, AND SEPARATING THE REGENERANT ELUATE CUT FROM THE COMPLEX ELUATE CUT.
Claim 2
Independent Claim
64 words
A METHOD OF SEPARATING AN ION-EXCHANGE REGENERANT FROM A SOLUTION CONTAINING A COMPLEX OF SAID REGENERANT WITH A COUNTER-ION REGENERANT COMPRISING THE STEPS OF: PASSING SAID SOLUTION THROUGH A CHROMATOGRAPHIC MEDIA CAPABLE OF RESOLVING SAID REGENERANT FROM THE COMPLEX, PASSING ELUANT THROUGH THE MEDIA TO FROM A REGENERANT CUT AND A COMPLEX CUT, AND SEPARATING THE REGENERANT ELUATE CUT FROM THE COMPLEX ELUATE CUT.
Claim 3
Dependent Claim
39 words
A method according to claim 1 in which the solution is an aqueous solution containing free cation regenerant and a complex of cation regenerant and anion regenerant, said solution having a cation regenerant concentration of at least one normal.
Claim 4
Dependent Claim
19 words
A method according to claim 2 in which said concentration is from 2-3 normal and the eluant is water.
Claim 5
Dependent Claim
18 words
A method according to claim 2 in which the pK of the regenerants is between 3 and 7.
Claim 6
Dependent Claim
15 words
A method according to claim 2 in which the anion regenerant is an organic base.
Claim 7
Dependent Claim
14 words
A method according to claim 5 in which the organic base is an amine.
Claim 8
Dependent Claim
12 words
A method according to claim 6 in which the amine is trimethylamine.
Claim 9
Dependent Claim
23 words
A method according to claim 4 in which the cation regenerant is selected from metal chelate complexing agents and weakly acidic carboxylic acids.
Claim 10
Dependent Claim
22 words
A method according to claim 8 in which the cation regenerant is an hydroxy or alkoxy substituted alkanoic acid of the formula:
Claim 11
Dependent Claim
26 words
A method according to claim 9 in which the cation regenerant is selected from Alpha -lactic acid, Beta -lactic acid, Beta -methoxypropionic acid and 4,7-dioxacaprylic acid.
Claim 12
Dependent Claim
24 words
A method according to claim 4 in which the chromatographic media has a pK from 8-12 and contains weak acid or weak base functionality.
Claim 13
Dependent Claim
22 words
A method according to claim 11 in which the chromatographic media contains acid functionality and the cation regenerant cut is eluted first.
Claim 14
Dependent Claim
15 words
A method according to claim 12 in which the chromatographic media is a silica gel.
Claim 15
Dependent Claim
16 words
A method according to claim 13 in which the silica gel has a pK from 9-10.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |