US4093560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra high silicon-content zeolites and preparation thereof
Assignee: Mobil Oil AS
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Filing: 1976-05-20
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Granted: 1978-06-06
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Expires: 1996-05-20
Abstract
Abstract A method is provided for obtaining crystalline dealuminized products by treating a slurry of a crystalline aluminosilicate zeolite in an aqueous solution of an ammonium or alkali metal salt which upon acidification yields an anion which complexes with aluminum by adding to said slurry a water-soluble acid having a first ionization constant greater than 10-2 at a rate such that a controlled amount of aluminum is removed from the zeolite to yield a resulting product from which at least about 10% and as much as about 85% of the initial aluminum has been removed while retaining more than 60% of the original crystallinity.
Inventors
- 👤 George T. Kerr
- 👤 Arthur W. Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/026; B; B01; B01J; B01J2229/00; B01J2229/10; B01J2229/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A method of removing aluminum from a crystalline aluminosilicate zeolite characterized by an initial silica/alumina ratio of at least about 2:1 but less than about 6:1 which comprises preparing a slurry of said zeolite in alkali metal or ammonium form in an aqueous solution of an ammonium or alkali metal salt which upon acidification yields an anion which complexes with aluminum, adding to said slurry a water-soluble acid having a first ionization constant greater than 10 -2 at a rate such that between about 5 and about 15 percent aluminum is removed per day to yield a resulting product which at least about 70 percent and as much as about 85 percent of the initial aluminum has been removed while retaining more than about 60 percent of the original crystallinity.
Claim 2
Independent Claim
130 words
A method of removing aluminum from a crystalline aluminosilicate zeolite characterized by an initial silica/alumina ratio of at least about 2:1 but less than about 6:1 which comprises preparing a slurry of said zeolite in alkali metal or ammonium form in an aqueous solution of an ammonium or alkali metal salt which upon acidification yields an anion which complexes with aluminum, adding to said slurry a water-soluble acid having a first ionization constant greater than 10 -2 at a rate such that between about 5 and about 15 percent aluminum is removed per day to yield a resulting product which at least about 70 percent and as much as about 85 percent of the initial aluminum has been removed while retaining more than about 60 percent of the original crystallinity.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said acid is a mineral acid.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein said mineral acid is hydrochloric acid.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein said zeolite is zeolite Y.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said salt is an ammonium or alkali metal ethylenediaminetetraacetate.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said salt is disodium dihydrogen ethylenediaminetetraacetate.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said salt is diammonium dihydrogen ethylenediaminetetraacetate.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein said rate is such that about 10 percent aluminum is removed per day.
Claim 10
Dependent Claim
10 words
A crystalline product obtained by the method of claim 1.
Claim 11
Dependent Claim
10 words
A crystalline product obtained by the method of claim 4.
Claim 12
Dependent Claim
10 words
A crystalline product obtained by the method of claim 5.
References Cited (Backward Citations)
US3442795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |