US4551228A
Expired / Lapsed
US
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Method for improving reformer yield selectivity
Assignee: Mobil Oil AS
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Filing: 1984-05-01
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Granted: 1985-11-05
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Expires: 2004-05-01
Abstract
Abstract Yield selectivity of a multibed catalytic reformer operating below design capacity is enhanced by adjusting inlet temperature of at least one catalyst bed to near-quenching conditions while adjusting the inlet temperature of at least one catalyst bed to favor yield selective reforming reactions. Significant increases in C5+ yields are obtained without any modification of the reforming unit.
Inventors
- 👤 Amilcare Ramella
- 👤 Hsin-Ju Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:09
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/085
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
84 words
In a method for reforming naphtha boiling range hydrocarbon charge stocks with platinum group metal-containing reforming catalysts employing a plurality of catalyst bed reactors, the improvement whereby reformer C 5 + yield selectivity is enhanced which comprises operating at least one reactor at near-quenching conditions comprising inlet temperatures ranging from about 316° to 427° C. (600° to 800° F.) while operating at least one reactor under yield-selective reforming conditions conditions comprising inlet temperatures ranging from about 454° to 549° C. (850° to 1020° F.).
Claim 2
Dependent Claim
84 words
In a method for reforming naphtha boiling range hydrocarbon charge stocks with platinum group metal-containing reforming catalysts employing a plurality of catalyst bed reactors, the improvement whereby reformer C 5 + yield selectivity is enhanced which comprises operating at least one reactor at near-quenching conditions comprising inlet temperatures ranging from about 316° to 427° C. (600° to 800° F.) while operating at least one reactor under yield-selective reforming conditions conditions comprising inlet temperatures ranging from about 454° to 549° C. (850° to 1020° F.).
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said reforming is carried out in the presence of a first, second and third catalyst bed.
Claim 4
Dependent Claim
28 words
The method of claim 2 wherein said first catalyst bed is maintained at near-quenching conditions while said second and third catalyst beds are maintained at yield-selective reforming conditions.
Claim 5
Dependent Claim
28 words
The method of claim 2 wherein said second catalyst bed is maintained at near-quenching conditions while said first and third catalyst beds are maintained at yield-selective reforming conditions.
Claim 6
Dependent Claim
28 words
The method of claim 2 wherein said third catalyst bed is maintained at near-quenching conditions while said first and second catalyst beds are maintained at yield-selective reforming conditions.
Claim 7
Dependent Claim
70 words
The method of claim 2 wherein said first catalyst bed is maintained at an inlet temperature ranging from about 316° to 427° C. (600° to 800° F.), said second catalyst bed is maintained at an inlet temperature ranging from about 454° to 549° C. (850° to 1020° F.) and said third catalyst bed is maintained at an inlet temperature ranging from about 454° to 549° C. (850° to 1020° F.).
Claim 8
Dependent Claim
69 words
The method of claim 2 wherein said first catalyst bed is maintained at an inlet temperature of about 454° to 549° C. (850° to 1020° F.) said second catalyst bed is maintained at an inlet temperature ranging from about 343° to 427° C. (650° to 800° F.) and said third catalyst bed is maintained at an inlet temperature ranging from about 454° to 549° C. (850° to 1020° F.).
Claim 9
Dependent Claim
70 words
The method of claim 2 wherein said first catalyst bed is maintained at an inlet temperature ranging from about 454° to 549° C. (850° to 1020° F.), said second catalyst bed is maintained at an inlet temperature ranging from about 454° to 549° C. (850° to 1020° F.) and said third catalyst bed is maintained at an inlet temperature ranging from about 371° to 427° C. (700° to 800° F.).
Claim 10
Dependent Claim
24 words
The method of claim 1 wherein said reforming catalyst comprises a platinum type metal selected from the group consisting of platinum, palladium, and rhodium.
Claim 11
Dependent Claim
14 words
The method of claim 9 wherein said platinum type metal is supported on alumina.
Claim 12
Dependent Claim
13 words
The method of claim 10 wherein said reforming catalyst is a platinum-alumina catalyst.
Claim 13
Dependent Claim
38 words
The method of claim 2 wherein the first and second catalyst beds contain approximately equal volumes of catalyst while the third catalyst bed contains at least the sum of the volumes of the first and second catalyst beds.
Claim 14
Dependent Claim
43 words
The method of claim 9 wherein the first catalyst bed contains about 20% of the total catalyst volume, the second catalyst bed contains about 30% of the total catalyst volume and the third catalyst bed contains about 50% of the total catalyst volume.
Claim 15
Dependent Claim
11 words
The method of claim 9 wherein said reforming catalyst comprises rhenium.
References Cited (Backward Citations)
US4208397A
Cited
US4174271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |