US3939246A
Expired / Lapsed
US
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Manufacture of crystalline aluminosilicate zeolites
Assignee: Mobil Oil AS
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Filing: 1974-03-29
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Granted: 1976-02-17
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Expires: 1994-03-29
Abstract
Abstract Crystallization of aluminosilicate zeolites of the molecular sieve type either as such or in aggregate combination with clay mineral is accomplished by the addition of a flux constituting an alkali metal salt to a kaolin-type clay prior to calcination and caustic aging of said clay.
Inventors
- 👤 Louis D. Rollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:32
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2815
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A process for effecting conversion of kaolin-type clays to crystalline aluminosilicate molecular sieve zeolites of the faujasite type which comprises: a. mixing the kaolin-type clay with a flux constituting a halide or carbonate of an alkali metal corresponding to between about 5 and about 20 weight percent, calculated as alkali metal oxide, of the kaolin-type clay; b. calcining the resulting mixture at a temperature within the approximate range of 880° to 1100°C. for a sufficient time for the clay to undergo the characteristic kaolin exotherm after dehydration is completed; and c. aging the fluxed calcined kaolin-type clay in an aqueous solution of sodium hydroxide of approximately 5 to 20 weight percent concentration at a temperature within the approximate range of 30° to 110°C. until crystallization of the aluminosilicate zeolite is achieved.
Claim 2
Dependent Claim
131 words
A process for effecting conversion of kaolin-type clays to crystalline aluminosilicate molecular sieve zeolites of the faujasite type which comprises: a. mixing the kaolin-type clay with a flux constituting a halide or carbonate of an alkali metal corresponding to between about 5 and about 20 weight percent, calculated as alkali metal oxide, of the kaolin-type clay; b. calcining the resulting mixture at a temperature within the approximate range of 880° to 1100°C. for a sufficient time for the clay to undergo the characteristic kaolin exotherm after dehydration is completed; and c. aging the fluxed calcined kaolin-type clay in an aqueous solution of sodium hydroxide of approximately 5 to 20 weight percent concentration at a temperature within the approximate range of 30° to 110°C. until crystallization of the aluminosilicate zeolite is achieved.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the kaolin-type clay is kaolinite.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the kaolin-type clay is halloysite.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein said temperature of calcining is within the approximate range of 925° to 1100°C.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said flux is sodium chloride.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein said flux is sodium carbonate.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein said flux is an alkali metal halide.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein said flux is an alkali metal carbonate.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein the temperature of aging is between about 80° and about 95°C.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |