US4216083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for complete or selective removal of salts from aqueous solution
Assignee: Individual
•
Filing: 1978-09-19
•
Granted: 1980-08-05
•
Expires: 1998-09-19
Abstract
Abstract A process by which salts are removed or recovered from an aqueous solution by means of a polyether, by contacting the aqueous solution with active carbon impregnated with a cyclic or linear polyether, and then eluting ether and salt successively from the carbon. The aqueous solution of salts may be passed through a column packed with the active carbon impregnated with a polyether. The polyether may be recovered from the carbon by elution with a nonpolar or slightly polar water-immiscible organic solvent, and the salt(s) may then be recovered by elution with water.
Inventors
- 👤 Johannes Dale
- 👤 Gerd Borgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:07
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/288; B; B01; B01D; B01D15/00; B01D15/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A process for complete, partial or selective removal of a salt from an aqueous solution containing the salt, which comprises (1) contacting the aqueous solution with active carbon impregnated with a cyclic or linear polyether, said impregnation having been carried out by contacting the carbon with an aqueous solution of the polyether, and (2) successively eluting the polyether and the salt from the carbon, using a non-polar or slightly polar water-immiscible organic solvent to elute the polyether, and water to elute the salt.
Claim 2
Dependent Claim
83 words
A process for complete, partial or selective removal of a salt from an aqueous solution containing the salt, which comprises (1) contacting the aqueous solution with active carbon impregnated with a cyclic or linear polyether, said impregnation having been carried out by contacting the carbon with an aqueous solution of the polyether, and (2) successively eluting the polyether and the salt from the carbon, using a non-polar or slightly polar water-immiscible organic solvent to elute the polyether, and water to elute the salt.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the anion portion of the salt is inorganic.
Claim 4
Dependent Claim
19 words
A process according to claim 2, wherein the salt is a nitrate, a halide, a sulphate or a phosphate.
Claim 5
Dependent Claim
41 words
A process according to claim 1, wherein an aqueous solution of several salts in admixture is passed through a column packed with active carbon which in advance has been impregnated with the polyether, whereby the salts are adsorbed to different extents.
Claim 6
Dependent Claim
22 words
A process according to claim 1, wherein the polyether is a cyclic polyether which is an oligomer or polymer of ethylene oxide.
Claim 7
Dependent Claim
17 words
A process according to claim 1, wherein the aqueous solution contains one or more alkali metal salts.
References Cited (Backward Citations)
GB831745A
Cited
US3442819A
Cited
US3562295A
Cited
CH525017A
Cited
NO129384B
Cited
US3728257A
Cited
NO132200C
Cited
US3928386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |