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US3607043A
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Cation and thermal stabilization of a faujasite-type zeolite
Assignee: WR Grace and Co Conn
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Filing: 1969-11-19
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Granted: 1971-09-21
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Expires: 1989-11-19
Abstract
Abstract A process for preparing a faujasite-type zeolite having a silica to alumina ratio of at least 3.2 by treating the faujasite with a combination of ammonium ion exchange and metal cation exchange, including rare earths, to reduce the Na20 level in the product to below 3 percent followed by thermal stabilization. The final step in the process is replacement of at least part of the cations with aluminum ions by exchange with an aluminum salt solution. The resulting zeolite is characterized by high surface area, exceptional catalytic activity and a favorable catalytic selectivity. The zeolite has exceptionally high activity and selectivity when used as a component in a hydrocarbon-cracking catalyst.
Inventors
- 👤 Carl Vance Mcdaniel
- 👤 Richard William Baker
- 👤 Clark Ace Rundell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:16
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01J29/00; B01J29/04; B01J29/06; B01J29/08; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
The process according to claim 1 wherein the rare earth ions are introduced into the zeolite by exchange with a mixed rare earth salt solution.
Claim 2
Dependent Claim
31 words
The process according to claim 1 wherein the ammonium salt solution contains a salt selected from the group consisting of ammonium sulfate, ammonium chloride, tetraethyl ammonium chloride, and tetraethyl ammonium sulfate.
Claim 3
Dependent Claim
34 words
The process according to claim 1 wherein the exchange with ammonium salt solution is carried out at a temperature of about 25* to 115* C. for a period of about 0.5 to 25 hours.
Claim 4
Dependent Claim
19 words
The process according to claim 1 wherein the aluminum exchange is carried out with a mixed aluminum-ammonium salt solution.
Claim 5
Dependent Claim
172 words
A process for preparing an aluminum-form zeolitic crystalline aluminosilicate having the empirical formula:(0.1 to 0.7 Al2/30+0.02 to 0.6 RE2/30): Al203: 3.2-7 SiO2: 0-9 H20 characterized by resistance to thermal degradation at temperatures as high as 1,700* F., a surface area in excess of 800 square meters per gram and a rare earth content of 0.3 to 10 percent by weight which comprises: a. preparing a faujasite having a silica to alumina ratio of 3.2 to 7.0, b. reducing the Na20 content of the zeolite to about 3 weight percent by ion exchange with an ammonium sulfate solution, c. ion exchanging the zeolite with a rare earth salt solution to impart a rare earth content of 0.3 to 10 percent by weight to the zeolite, d. drying and calcining the zeolite at a temperature of about 700* to 1,600* F. for about 0.1 to 3 hours, e. exchanging with an aluminum salt solution to decrease to sodium oxide content below about 1 weight percent and f. washing, drying, and recovering the zeolite product.
Claim 6
Dependent Claim
73 words
As a composition of matter, an aluminum-form faujasite-type zeolitic crystalline aluminosilicate having the empirical formula: (0.01 to 0.7 Al2/30+0.02 to 0.6 RE2/30): 3.2-7 SiO2: 0-9 H20 characterized by: a. stability to thermal degradation to a temperature of 1,700* F., c. a surface area in excess of 800 square mEters per gram, e. an Na20 content of less than 1 weight percent, and f. an ability to crack hydrocarbons selectively to a C5+gasoline fraction.
Claim 7
Dependent Claim
19 words
The composition according to claim 7 wherein said zeolite is suspended in and dispersed throughout a suitable inorganic matrix.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |