US4276160A
Expired / Lapsed
US
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Method for waste water purification with the aid of a sorption agent
Assignee: Karlsruher Institut für Technologie
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Filing: 1978-06-07
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Granted: 1981-06-30
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Expires: 1998-06-07
Abstract
Abstract A method of purifying waste water with treated aluminum oxide. The method comprises contacting the waste water with Al2O3 which has been treated with ions which when incorporated in the crystal lattice of the Al2O3 are capable of delaying crystallization of the gamma phase of the Al2O3 or with the salts of said ions. In one embodiment, the Al2O3 is artificially synthesized and the treatment comprises incorporating the ions, which may be either anions or cations, in the course of the synthesis. Alternatively, the Al2O3 may be treated by subjecting the Al2O3 to a surface treatment with ions capable of delaying crystallization of the gamma phase or the salts thereof. In yet another embodiment, the Al2O3 may be doped with CO2.
Inventors
- 👤 Dietfried Donnert
- 👤 Siegfried Eberle
- 👤 Gerhard Endres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:31
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/281; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
73 words
A method of purifying waste water by contacting the waste water with a sorption agent, comprising contacting said waste water with a sorption agent which consists essentially of Al 2 O 3 which has been treated with ions which when incorporated in the crystal lattice of said Al 2 O 3 are capable of delaying crystallization of the gamma phase of said Al 2 O 3 or with the salts of said ions.
Claim 2
Independent Claim
73 words
A method of purifying waste water by contacting the waste water with a sorption agent, comprising contacting said waste water with a sorption agent which consists essentially of Al 2 O 3 which has been treated with ions which when incorporated in the crystal lattice of said Al 2 O 3 are capable of delaying crystallization of the gamma phase of said Al 2 O 3 or with the salts of said ions.
Claim 3
Dependent Claim
34 words
The method as defined by claim 1 wherein said Al 2 O 3 is artificially synthesized from reagents and said treatment comprises incorporating said ions into said reagents in the course of said synthesis.
Claim 4
Dependent Claim
37 words
The method as defined by claim 2 wherein said ions are cations and said cations are incorporated in an amount ranging from about 0.1% to about 10% by weight of said treated Al 2 O 3 .
Claim 5
Dependent Claim
32 words
The method as defined by claim 3 wherein said cations are incorporated in an amount ranging from about 0.5% to about 10% by weight of said treated Al 2 O 3 .
Claim 6
Dependent Claim
15 words
The method as defined by claim 4 wherein said ions comprise alkali earth metal cations.
Claim 7
Dependent Claim
13 words
The method as defined by claim 4 wherein said ions are iron cations.
Claim 8
Dependent Claim
13 words
The method as defined by claim 4 wherein said ions are chromium cations.
Claim 9
Dependent Claim
33 words
The method as defined by claim 1 wherein said Al 2 O 3 is treated by subjecting said Al 2 O 3 to a surface treatment with at least one of said salts.
Claim 10
Dependent Claim
33 words
The method as defined by claim 1 wherein said Al 2 O 3 is treated by subjecting said Al 2 O 3 to a surface treatment with at least one of said ions.
Claim 11
Dependent Claim
26 words
The method as defined by claim 1 wherein said ions comprise anions selected from the group consisting of chlorides, nitrates, sulfates, hydrogen phosphates, and mixtures thereof.
Claim 12
Dependent Claim
48 words
The method as defined by claim 10 wherein said surface treatment comprises introducing said anions to the surface of said Al 2 O 3 in an amount ranging from about 0.5% to about 10% by weight based upon the weight of the treated Al 2 O 3 .
Claim 13
Dependent Claim
46 words
The method as defined by claim 1 wherein said Al 2 O 3 is treated by subjecting said Al 2 O 3 to a surface treatment with cations in an amount between about 0.5% to 10% by weight of said treated Al 2 O 3 .
Claim 14
Dependent Claim
13 words
The method as defined by claim 12 wherein said cations comprise iron cations.
Claim 15
Dependent Claim
15 words
The method as defined by claim 12 wherein said cations comprise alkali earth metal cations.
Claim 16
Dependent Claim
13 words
The method as defined by claim 12 wherein said cations comprise chromium cations.
Claim 17
Independent Claim
40 words
A method of purifying waste water by contacting the waste water with a sorption agent, comprising contacting said waste water with a sorption agent which consists essentially of Al 2 O 3 which has been doped with CO 2 .
Claim 18
Independent Claim
40 words
A method of purifying waste water by contacting the waste water with a sorption agent, comprising contacting said waste water with a sorption agent which consists essentially of Al 2 O 3 which has been doped with CO 2 .
Claim 19
Dependent Claim
40 words
The method as defined by claim 16 wherein said CO 2 is doped into said Al 2 O 3 in amounts ranging from about 0.05% to about 2.5% by weight with respect to said doped Al 2 O 3 .
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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |