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US3987080A
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Regeneration of vanadium-bronze ammoxidation catalyst
Assignee: Sun Ventures Inc
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Filing: 1975-05-12
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Granted: 1976-10-19
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Expires: 1995-05-12
Abstract
Abstract In an ammoxidation system where hydrocarbon, oxygen and ammonia are reacted at a temperature of from about 375°C. to about 450°C. in the presence of a vanadium bronze catalyst, the improvement of regenerating heat damaged catalyst by cooling the catalyst to below about 400°C. and then reheating it to a temperature of from about 510°C. to about 530°C. in the presence of oxygen.
Inventors
- 👤 David S. Barmby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:11
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/28; B; B01; B01J; B01J23/00; B01J23/90; B01J23/92; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
In an ammoxidation process where hydrocarbon, oxygen and ammonia are reacted at a temperature of from about 375° C. to about 450° C. in the presence of a vanadium bronze catalyst, the improvement of regenerating heat damaged catalyst by cooling the catalyst to below about 400° C. and then reheating it to a temperature of from about 510° C. to about 530° C. in the presence of oxygen.
Claim 2
Dependent Claim
68 words
In an ammoxidation process where hydrocarbon, oxygen and ammonia are reacted at a temperature of from about 375° C. to about 450° C. in the presence of a vanadium bronze catalyst, the improvement of regenerating heat damaged catalyst by cooling the catalyst to below about 400° C. and then reheating it to a temperature of from about 510° C. to about 530° C. in the presence of oxygen.
Claim 3
Dependent Claim
15 words
The process of claim 1 where the catalyst is a sodium-vanadium bronze supported on α-alumina.
Claim 4
Dependent Claim
11 words
The process of claim 2 where the catalyst is Bronze I.
Claim 5
Dependent Claim
11 words
The process of claim 2 where the catalyst is Bronze II.
Claim 6
Dependent Claim
12 words
The process of claim 2 where the catalyst is an α-prime phase.
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |