US4795845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of dehydrocyclodimerization catalyst
Assignee: Honeywell UOP LLC
•
Filing: 1987-12-28
•
Granted: 1989-01-03
•
Expires: 2007-12-28
Abstract
Abstract A process for catalytic dehydrocyclodimerization and regeneration of the catalyst. C 2 to C 5 aliphatic hydrocarbons are reacted to produce aromatics, using a catalyst of a composition especially adapted to minimize deposition of coke on the catalyst. The catalyst is comprised of alumina which contains phosphorus, gallium, and a crystalline aluminosilicate having a silica to alumina ratio of at least 12. The use of this catalyst has resulted in a five-fold reduction in the rate of coke deposition, compared to a conventional dehydrocyclodimerization catalyst. However, the activity of this catalyst once it becomes deactivated is only recovered by burning the coke accumulated upon the deactivated catalyst at catalyst regeneration conditions in the presence of an oxygen-containing gas.
Inventors
- 👤 David C. Martindale
- 👤 Joseph A. Kocal
- 👤 Tai-Hsiang Chao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:42
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2724; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/405; B01J29/90; C07C2/00; C07C2/76; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; B01J29/65; B01J29/70; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/08; C07C2527/00; C07C2527/14; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A process for the dehydrocyclodimerization of hydrocarbons which comprises contacting a feed stream containing aliphatic hydrocarbons with a catalyst, under dehydrocyclodimerization conditions, where said catalyst is comprised of phosphorus-containing alumina, gallium, and a crystalline aluminosilicate having a silica to alumina ratio of at least 12, where said catalyst becomes deactivated as a result of the dehydrocyclodimerization reaction, and where the deactivated catalyst is regenerated by contacting the deactivated catalyst with an oxygen-containing regeneration gas at catalyst regeneration conditions.
Claim 2
Dependent Claim
78 words
A process for the dehydrocyclodimerization of hydrocarbons which comprises contacting a feed stream containing aliphatic hydrocarbons with a catalyst, under dehydrocyclodimerization conditions, where said catalyst is comprised of phosphorus-containing alumina, gallium, and a crystalline aluminosilicate having a silica to alumina ratio of at least 12, where said catalyst becomes deactivated as a result of the dehydrocyclodimerization reaction, and where the deactivated catalyst is regenerated by contacting the deactivated catalyst with an oxygen-containing regeneration gas at catalyst regeneration conditions.
Claim 3
Dependent Claim
54 words
The process of claim 1 further characterized in that the deactivated catalyst is regenerated in the presence of a cyclic flow of oxygen-containing regeneration gas in which at least a portion of the regeneration gas leaving the deactivated catalyst bed is combined with an oxygen-containing gas and recycled back to the deactivated catalyst bed.
Claim 4
Dependent Claim
26 words
The process of claim 1 further characterized in that the deactivated catalyst is regenerated in the presence of a once-through flow of an oxygen-containing regeneration gas.
Claim 5
Dependent Claim
18 words
The process of claim 1 further characterized in that the deactivated catalyst is contained in a fixed bed.
Claim 6
Dependent Claim
20 words
The process of claim 1 further characterized in that the deactivated catalyst is contained in a moving bed of catalyst.
Claim 7
Dependent Claim
40 words
The process of claim 1 further characterized in that the regeneration conditions comprise a temperature of from 300°-700° C., a pressure of from atmospheric to 20 atmospheres, and a regeneration gas oxygen content of from 0.10 to 23.0 mole percent.
Claim 8
Dependent Claim
108 words
A process for the dehydrocyclodimerization of hydrocarbons which comprises contacting a feed stream containing aliphatic hydrocarbons with a catalyst, under dehydrocyclodimerization conditions, where said catalyst is comprised of phosphorus-containing alumina, gallium, and a crystalline aluminosilicate having a silica to alumina ratio of at least 12, where said catalyst become deactivated as a result of the dehydrocyclodimerization reaction, and where the deactivated catalyst is regenerated by contacting the deactivated catalyst with a cyclic flow of an oxygen-containing regeneration gas at catalyst regeneration conditions including a temperature of from 300°-600° C., a pressure from 1 to 10 atmospheres, and at regeneration oxygen content of from 0.1 to 10.0 mole percent.
Claim 9
Dependent Claim
108 words
A process for the dehydrocyclodimerization of hydrocarbons which comprises contacting a feed stream containing aliphatic hydrocarbons with a catalyst, under dehydrocyclodimerization conditions, where said catalyst is comprised of phosphorus-containing alumina, gallium, and a crystalline aluminosilicate having a silica to alumina ratio of at least 12, where said catalyst become deactivated as a result of the dehydrocyclodimerization reaction, and where the deactivated catalyst is regenerated by contacting the deactivated catalyst with a cyclic flow of an oxygen-containing regeneration gas at catalyst regeneration conditions including a temperature of from 300°-600° C., a pressure from 1 to 10 atmospheres, and at regeneration oxygen content of from 0.1 to 10.0 mole percent.
Claim 10
Dependent Claim
18 words
The process of claim 7 further characterized in that the oxygen of the oxygen-containing gas comes from air.
References Cited (Backward Citations)
US4480144A
Cited
US4654455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |