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US4356338A
Expired / Lapsed
US
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Extending catalyst life by treating with phosphorus and/or steam
Assignee: Mobil Oil AS
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Filing: 1980-10-08
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Granted: 1982-10-26
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Expires: 2000-10-08
Abstract
Abstract There is disclosed a method for decreasing catalyst coking and extending the usable catalyst life by pre-treatment of the catalyst with steam and/or a phosphorus-containing compound. Catalysts benefiting from such pre-treatment comprise crystalline zeolites characterized by a silica to alumina mole ratio of at least 12 and a constraint index, as herein defined, within the approximate range of 1 to 12.
Inventors
- 👤 Lewis B. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:16
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J37/00; B01J37/08; B01J37/10; B01J37/28; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; B01J29/65; B01J29/70; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
In the process of carrying out aromatization hydrocarbon conversion reactions over a catalyst comprising a crystalline zeolite characterized by a silica to alumina molar ratio of at least 12 and a Constraint Index of from about 1 to 12, the improvement which comprises: pretreating said catalyst to reduce the rate of catalyst aging and detrimental formation of coke thereon which occurs during said conversion reactions, by reacting said catalyst with a phosphorus-containing compound to deposit between 2% and 15% by weight of phosphorus on said catalyst and by subjecting said catalyst to an atmosphere comprising from 5% to 100% of steam at a temperature of from about 250° C. to about 1000° C. for a period of from about 15 minutes to about 100 hours.
Claim 2
Dependent Claim
125 words
In the process of carrying out aromatization hydrocarbon conversion reactions over a catalyst comprising a crystalline zeolite characterized by a silica to alumina molar ratio of at least 12 and a Constraint Index of from about 1 to 12, the improvement which comprises: pretreating said catalyst to reduce the rate of catalyst aging and detrimental formation of coke thereon which occurs during said conversion reactions, by reacting said catalyst with a phosphorus-containing compound to deposit between 2% and 15% by weight of phosphorus on said catalyst and by subjecting said catalyst to an atmosphere comprising from 5% to 100% of steam at a temperature of from about 250° C. to about 1000° C. for a period of from about 15 minutes to about 100 hours.
Claim 3
Dependent Claim
15 words
A process as recited in claim 1 wherein said catalyst additionally comprises a binder therefor.
Claim 4
Dependent Claim
16 words
A process as recited in claim 2 wherein said binder is Al 2 O 3 .
Claim 5
Dependent Claim
25 words
A process according to claim 1 wherein said catalyst is contacted with steam before being reacted with phosphorus-containing compound in order to effect catalyst pretreatment.
Claim 6
Dependent Claim
15 words
A process as recited in claim 4 wherein said catalyst additionally comprises a binder therefor.
Claim 7
Dependent Claim
16 words
A process as recited in claim 5 wherein said binder is Al 2 O 3 .
Claim 8
Dependent Claim
25 words
A process according to claim 1, 2, 3, 4, 5 or 6 wherein said crystalline zeolite is selected from ZSM-5, ZSM-11, ZSM-23, ZSM-35 and ZSM-38.
Claim 9
Dependent Claim
12 words
A process according to claim 7 wherein said crystalline zeolite is ZSM-5.
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) | 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 |