US4461845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of steam-deactivated catalysts
Assignee: Mobil Oil AS
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Filing: 1983-01-17
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Granted: 1984-07-24
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Expires: 2003-01-17
Abstract
Abstract A process is provided for reactivating a catalyst composition comprising a crystalline zeolite material having a silicon/aluminum atomic ratio of at least about 2, said catalyst composition having been deactivated by contact with steam. The method involves contacting said steam-deactivated catalyst composition with an aluminum compound at elevated temperature, and contacting said aluminum compound contacted catalyst composition with an aqueous acid solution.
Inventors
- 👤 Ralph M. Dessau
- 👤 George T. Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:37
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A process for reactivating a catalyst composition comprising a crystalline zeolite material having a silicon/aluminum atomic ratio of at least about 2, said catalyst composition having been deactivated by contact with steam, which comprises the steps of contacting said steam-deactivated catalyst composition with an aluminum compound at a temperature of from about 100° C. to about 850° C., and thereafter contacting said aluminum compound contacted catalyst composition with an aqueous acid solution of from about 0.001 molar to about 10 molar at a temperature of from about 20° C. to about 100° C.
Claim 2
Dependent Claim
93 words
A process for reactivating a catalyst composition comprising a crystalline zeolite material having a silicon/aluminum atomic ratio of at least about 2, said catalyst composition having been deactivated by contact with steam, which comprises the steps of contacting said steam-deactivated catalyst composition with an aluminum compound at a temperature of from about 100° C. to about 850° C., and thereafter contacting said aluminum compound contacted catalyst composition with an aqueous acid solution of from about 0.001 molar to about 10 molar at a temperature of from about 20° C. to about 100° C.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said crystalline zeolite material has a silicon/aluminum atomic ratio greater than 10.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said aqueous acid solution is from about 0.1 molar to about 2 molar.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein said aluminum compound is aluminum halide.
Claim 6
Dependent Claim
30 words
The process of claim 1 which comprises the additional step of calcining said acid solution contacted catalyst composition at a temperature of from about 200° C. to about 600° C.
Claim 7
Dependent Claim
37 words
The process of claim 5 which comprises the additional step of calcining said aluminum compound contacted catalyst composition at a temperature of from about 200° C. to about 600° C. prior to said acid solution contacting step.
Claim 8
Dependent Claim
35 words
The process of claim 1 wherein said aluminum compound contacting step temperature is from about 100° C. to about 500° C., and said aqueous acid solution is from about 0.1 molar to about 1 molar.
Claim 9
Dependent Claim
46 words
The process of claim 1 wherein said crystalline zeolite material is selected from the group consisting of large pore structure zeolites exhibiting a Constraint Index of less than about 1 and intermediate pore structure zeolites exhibiting a Constraint Index of from about 1 to about 12.
Claim 10
Dependent Claim
37 words
The process of claim 1 wherein said crystalline zeolite material is selected from the group consisting of those having the structures of ZSM-5, ZSM-11, ZSM-5/ZSM-11 intermediate, ZSM-12, ZSM-20, ZSM-23, ZSM-35, ZSM-38, ZSM-48, zeolite Y and zeolite Beta.
Claim 11
Dependent Claim
19 words
The process of claim 1 wherein said catalyst composition is a composite of said zeolite material and a matrix.
Claim 12
Dependent Claim
10 words
The process of claim 10 wherein said matrix is alumina.
Claim 13
Dependent Claim
16 words
The process of claim 1 wherein said acid solution is an aqueous solution of hydrochloric acid.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |