US3882159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of molybdenum containing oxidation catalysts in fluid bed reactors
Assignee: Standard Oil Co
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Filing: 1973-08-20
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Granted: 1975-05-06
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Expires: 1993-08-20
Abstract
Abstract Molybdenum-containing oxidation catalysts used in a fluid-bed reactor have been discovered to become partially deactivated through loss of molybdenum from the catalyst. These partially deactivated catalysts are regenerated in situ by the addition of fluid-bed particles consisting of an essentially inert support material containing molybdenum.
Inventors
- 👤 James L Callahan
- 👤 Wilfrid G Shaw
- 👤 Arthur F Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:20
CPC Classifications
B; B01; B01J; B01J38/00; B01J38/04; B01J38/12; B01J38/16; B01J23/00; B01J23/16; B01J23/24; B01J23/28; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/90; B01J23/92; B01J23/94; B01J35/00; B01J35/19; B01J8/00; B01J8/18; B01J8/24; B01J8/26; C; C07; C07C; C07C253/00; C07C253/24; C07C253/26; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P20/584; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
IN THE PROCESS FOR THE AMMOXIDATION OF PROPYLENE AT A TEEMPERATURE OF ABOUT 200* TO ABOUT 600*C. IN A FLUID-BED REACTOR USING A FLUID-BED AMMOXIDATION CATALYST CONTAINING MOLYBDENUM TO PRODUCE ACRYLONITRILE WHEREIN SAID AMMOXIDATION CATALYST HAS BECOME PARTIALLY DEACTIVATED BY LOSS OF MOLYBDENYM, THE IMPROVEMENT COMPRISING REGENERATING THE AMMOXIDATION CATALYST AT REACTION TEMPERATURES IN THE PRESENCE OF AIR, STEAM OR MIXTURE THEREOF BY CONTACTING THE AMMOXIATION CATALYST WITH FLUID-BED PARTICLES CONSISTING OF (A) AN ESSENTIALLY INERT SUPPORT GIVING LESS THAN 25% CONVERSION OF THE PROPYLENE AND (B) MOLYBDENUM OXIDE.
Claim 2
Dependent Claim
89 words
IN THE PROCESS FOR THE AMMOXIDATION OF PROPYLENE AT A TEEMPERATURE OF ABOUT 200* TO ABOUT 600*C. IN A FLUID-BED REACTOR USING A FLUID-BED AMMOXIDATION CATALYST CONTAINING MOLYBDENUM TO PRODUCE ACRYLONITRILE WHEREIN SAID AMMOXIDATION CATALYST HAS BECOME PARTIALLY DEACTIVATED BY LOSS OF MOLYBDENYM, THE IMPROVEMENT COMPRISING REGENERATING THE AMMOXIDATION CATALYST AT REACTION TEMPERATURES IN THE PRESENCE OF AIR, STEAM OR MIXTURE THEREOF BY CONTACTING THE AMMOXIATION CATALYST WITH FLUID-BED PARTICLES CONSISTING OF (A) AN ESSENTIALLY INERT SUPPORT GIVING LESS THAN 25% CONVERSION OF THE PROPYLENE AND (B) MOLYBDENUM OXIDE.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the essentially inert support is selected from the group consisting of silica, alumina, silica-aluminum, zirconia, boron phosphate, silicon carbide or titania.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the essentially inert support is silica.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the regeneration takes place under conditions that are substantially the same as the conditions of thE process.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the regeneration is conducted during the course of the reaction.
References Cited (Backward Citations)
US3280167A
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US3518284A
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US3472892A
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US3644472A
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US3629148A
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US3639103A
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US3658877A
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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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |