Patent US4356156A successfully refreshed from Google Patents.
US4356156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zeolites bearing fluoride anions
Assignee: Evonik LIL Ltd
•
Filing: 1980-06-10
•
Granted: 1982-10-26
•
Expires: 2000-06-10
Abstract
Abstract The present invention provides the following: (a) A fluoride-treated zeolite in which the number of equivalents of fluoride exceeds the sum of the numbers of equivalents of all cations except for hydrogen, aluminium and silicon cations in the zeolite. (b) A process for fluoride-treating a zeolite wherein the zeolite is treated with a concentrated aqueous solution of a salt of hydrofluoric acid. (c) A process for at least partially removing metal ions from an aqueous solution, which comprises contacting the aqueous solution, containing the metal ions, with the fluoride-treated zeolite specified in (a) above or produced as specified in (b) above. (d) A process for the chromatographic separation of two or more metal ions in aqueous solution wherein the chromatographic stationary phase comprises the fluoride-treated zeolite specified in (a) above or produced as specified in (b) above.
Inventors
- 👤 Alan Dyer
- 👤 Abraham Araya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:26
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/281; B; B01; B01D; B01D15/00; B01D15/08; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; Y; Y10; Y10S; Y10S423/00; Y10S423/21; Y10S423/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
A process for the production of a zeolite bearing fluoride anions and cations other than hydrogen, aluminium or silicon cations in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminium and silicon cations comprising treating the zeolite with an aqueous solution of a salt of hydrofluoric acid which comprises a melt of KF.2H 2 O.
Claim 2
Dependent Claim
73 words
A process for the production of a zeolite bearing fluoride anions and cations other than hydrogen, aluminium or silicon cations in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminium and silicon cations comprising treating the zeolite with an aqueous solution of a salt of hydrofluoric acid which comprises a melt of KF.2H 2 O.
Claim 3
Dependent Claim
66 words
A process for the production of a zeolite bearing fluoride anions and cations other than hydrogen, aluminium or silicon cations in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminium and silicon cations comprising treating the zeolite with an aqueous solution having the approximate composition KF.2H 2 O.
Claim 4
Dependent Claim
66 words
A process for the production of a zeolite bearing fluoride anions and cations other than hydrogen, aluminium or silicon cations in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminium and silicon cations comprising treating the zeolite with an aqueous solution having the approximate composition KF.2H 2 O.
Claim 5
Dependent Claim
65 words
A process for the production of a zeolite bearing fluoride anions and cations other than hydrogen, aluminium and silicon in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminium and silicon cations comprising treating the zeolite with an aqueous solution of at least 50% by weight KF.
Claim 6
Dependent Claim
65 words
A process for the production of a zeolite bearing fluoride anions and cations other than hydrogen, aluminium and silicon in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminium and silicon cations comprising treating the zeolite with an aqueous solution of at least 50% by weight KF.
Claim 7
Dependent Claim
32 words
A process as claimed in claim 1 wherein, before treatment with the concentrated solution, exchangeable cations of the zeolite are replaced by cations identical to that of the salt of hydrofluoric acid.
Claim 8
Dependent Claim
36 words
A process as claimed in claim 4 wherein the replacement is conducted by contacting the zeolite with a dilute solution of a salt containing the cation identical to the cation of the salt of hydrofluoric acid.
Claim 9
Dependent Claim
24 words
A process as claimed in claim 5 wherein the said solution has a concentration of not more than 0.25 moles/liter of the said salt.
Claim 10
Dependent Claim
28 words
A process as claimed in claim 5 wherein the contact is at a temperature of not more than 40° C. over a period of at least 6 hours.
Claim 11
Dependent Claim
22 words
A process as claimed in claim 7 wherein the contact is at room temperature over a period of at least 12 hours.
Claim 12
Dependent Claim
51 words
A zeolite bearing fluoride anions and cations other than hydrogen, aluminum and silicon, in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminum and silicon cations, prepared by the process of claim 1.
Claim 13
Dependent Claim
51 words
A zeolite bearing fluoride anions and cations other than hydrogen, aluminum and silicon, in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminum and silicon cations, prepared by the process of claim 2.
Claim 14
Dependent Claim
51 words
A zeolite bearing fluoride anions and cations other than hydrogen, aluminum and silicon, in which the number of equivalents of fluoride anions exceeds the sum of the numbers of equivalents of all cations present in the zeolite except for hydrogen, aluminum and silicon cations, prepared by the process of claim 2.
References Cited (Backward Citations)
US3619412A
Cited
US3575887A
Cited
US3594331A
Cited
US3630965A
Cited
US3933983A
Cited
US4054511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |