US4460474A
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Process for the extraction of cesium ions from aqueous solutions using an adduct compound in solid form comprising a macrocyclical polyether and an inorganic heteropoly acid
Assignee: Karlsruher Institut für Technologie
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Filing: 1982-08-27
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Granted: 1984-07-17
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Expires: 2002-08-27
Abstract
Abstract A process for the extraction of cesium ions from an aqueous solution with an adduct compound in solid form containing a macrocyclical polyether and an inorganic heteropoly acid. The adduct compounds employed comprise an adduct of (a) benzo-15-crown-5 (B-15-C-5); dibenzo-21-crown-7 (DB-21-C-7); or dibenzo-30-crown-10 (DB-30-C-10), with (b) 12-molybdophosphoric acid (HPMo); 12-tungstophosphoric acid (HPW); 12-molybdosilicic acid (HSiMo); 12-tungstosilicic acid (HSiW); or an Na, K, Tl, or NH4 salt of any of these acids.
Inventors
- 👤 Ewald Blasius
- 👤 Karl-Heinz Nilles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:11
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5272; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12; G21F9/125
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
114 words
Process for the extraction of cesium ions from an aqueous solution with an adduct compound in solid form containing a crown ether and an inorganic heteropoly acid component which is stable in strong acid and oxidizing medium, comprising: employing as the adduct compound an adduct of (a) a crown ether selected from benzo-15-crown-5; dibenzo-21-crown-7; and dibenzo-30-crown-10; with (b) a heteropoly acid selected from 12-molybdophosphoric acid; 12-tungstophosphoric acid; 12-molybdosilicic acid; and 12-tundgsosilicic acid; or an Na, K, Tl, or NH 4 salt of the heteropoly acid, with the adduct of benzo-15-crown-5 with component (b) having a molar ratio of crown ether to heteropoly acid or heteropoly acid salt of less than or equal to 2:1.
Claim 2
Dependent Claim
114 words
Process for the extraction of cesium ions from an aqueous solution with an adduct compound in solid form containing a crown ether and an inorganic heteropoly acid component which is stable in strong acid and oxidizing medium, comprising: employing as the adduct compound an adduct of (a) a crown ether selected from benzo-15-crown-5; dibenzo-21-crown-7; and dibenzo-30-crown-10; with (b) a heteropoly acid selected from 12-molybdophosphoric acid; 12-tungstophosphoric acid; 12-molybdosilicic acid; and 12-tundgsosilicic acid; or an Na, K, Tl, or NH 4 salt of the heteropoly acid, with the adduct of benzo-15-crown-5 with component (b) having a molar ratio of crown ether to heteropoly acid or heteropoly acid salt of less than or equal to 2:1.
Claim 3
Dependent Claim
26 words
Process as defined in claim 1, wherein the adduct compound is present in the form of a solid ion exchanger phase incorporated in a porous carrier.
Claim 4
Dependent Claim
13 words
Process as defined in claim 2 wherein the carrier is porous aluminum oxide.
Claim 5
Dependent Claim
13 words
Process as defined in claim 2 wherein the carrier is porous silica gel.
Claim 6
Dependent Claim
46 words
Process as defined in claim 2, 3 or 4, wherein the aqueous solution containing the cesium ions is brought into contact with the solid ion exchanger phase to load the solid phase with cesium ions, and the loaded solid phase is separated from the aqueous solution.
Claim 7
Dependent Claim
39 words
Process as defined in claim 1, wherein the aqueous solution containing cesium ions is brought in contact with the solid adduct compound, to load the solid with cesium ions, and the loaded solid is separated from the aqueous solution.
Claim 8
Dependent Claim
32 words
Process as defined in claim 1, wherein the solid adduct compound has a molar ratio of crown ether to heteropoly acid, or heteropoly acid salt, in the range between ≧0.5:1 and ≦2:1.
Claim 9
Dependent Claim
50 words
Process as defined in claim 7, wherein the solid adduct compound has been obtained by (a) dissolving the crown ether and heteropoly acid or salt in a molar ratio range of crown ether to heteropoly acid or salt between ≧0.5:1 and ≦2.0:1 in acetone, and (b) then removing the acetone.
Claim 10
Dependent Claim
20 words
Process as defined in claim 8, wherein the acetone is removed by extracting the acetone and evaporating any acetone residue.
Claim 11
Dependent Claim
19 words
Process as defined in claim 8 or 9 wherein the crown ether and acid are dissolved in acetone alone.
Claim 12
Dependent Claim
24 words
Process as defined in claim 8 or 9 wherein the crown ether and acid are dissolved in a suspension of silica gel in acetone.
Claim 13
Dependent Claim
26 words
Process as defined in claim 8 or 9 where the crown ether and acid are dissolved in a suspension of Al 2 O 3 in acetone.
Claim 14
Dependent Claim
38 words
Process as defined in claim 8, wherein the crown ether/heteropolyacid salt adduct has been obtained after removing the acetone, as in step (b), by contacting the H + adduct with a K, Tl or NH 4 salt solution.
Claim 15
Dependent Claim
75 words
Process as defined in claim 7, wherein the solid adduct compound has been obtained by (a) dissolving in acetone a preproduced solid crown ether/heteropoly acid or heteropoly acid salt adduct having a ≧3:1 molar ratio of crown ether to heteropoly acid or salt, (b) adding heteropoly acid or heteropoly acid salt until a molar ratio of crown ether to heteropoly acid or salt between ≧0.5:1 and ≦2.0:1 is reached, and (c) then removing the acetone.
Claim 16
Dependent Claim
20 words
Process as defined in claim 14, wherein the acetone is removed by extracting the acetone and evaporating any acetone residue.
Claim 17
Dependent Claim
16 words
Process as defined in claim 14 or 15, wherein the adduct is dissolved in acetone alone.
Claim 18
Dependent Claim
21 words
Process as defined in claim 14 or 15, wherein the adduct is dissolved in a suspension of silica gel in acetone.
Claim 19
Dependent Claim
23 words
Process as defined in claim 14 or 15, wherein the adduct is dissolved in a suspension of Al 2 O 3 in acetone.
Claim 20
Dependent Claim
22 words
Process as defined in claim 7, wherein the molar ratio of crown ether to heteropoly acid or heteropoly acid salt is 1:1.
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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |