US2501436A
Expired / Lapsed
US
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Process for effecting catalytic conversions with finely divided catalysts
Assignee: Shell Development Co
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Filing: 1945-06-11
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Granted: 1950-03-21
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Expires: 1965-06-11
Abstract
No abstract record available.
Inventors
- 👤 Donald L Cleveland
- 👤 John A Hatton
- 👤 George C Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:40
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
203 words
IN A CATALYTIC CONVERSION SYSTEM IN WHICH A POWDERED CATALYST CONSISTING OF FINELY DIVIDED PARTICLES OF DIFFERENT SIZES LESS THAN ABOUT 300 MICRONS IN DIAMETER IS RECYCLED THROUGH A CONVERSION ZONE, AND IN WHICH SUSPENDED CATALYST RANGING ESSENTIALLY FROM A FRACTION OF A MICRON DIAMETER UP TO ABOUT 20 MICRONS DIAMETER IS SEPARATED AND RECOVERED FOR REUSE FROM A GAS OR VAPOR STREAM LEAVING THE SYSTEM BY MEANS OF AN ELECTRICAL PRECIPITATOR, AND IN WHICH THE DECLINE IN THE ACTIVELY OF THE CATALYST IN THE SYSTEM WITH USE IN COUNTERACTED BY CONTINUALLY REPLENISHING THE CATALYST WITH MORE ACTIVE CATALYST, THE IMPROVEMENT WHICH COMPRISES WITHDRAWING A PORTION OF SAID POWDERED CATALYST CONSISTING OF FINELY DIVIDED PARTICLES LESS THAN ABOUT 300 MICRONS IN DIAMETER AND HAVING SUBSTANTIALLY THE SAME PARTICLE SIZE DISTRIBUTION AS THE SAID CATALYST IN THE SYSTEM, GRINDING SAID WITHDRAWN PORTION OF THE CATALYST TO THE INCREASE THE PROPORTION OF PARTICLES RANGING ESSENTIALLY FROM A FRACTION OF A MICRON DIAMETER UP TO ABOUT 20 MICRONS DIAMETER THEREIN, AND RECOMBINING THE TOTAL PORTION OF CATALYST SO TREATED, INCLUDING THE MATERIAL RANGING ESSENTIALLY FROM A FRACTION OF A MICRON DIAMETER UP TO ABOUT 20 MICRONS DIAMETER, WITH THE REMAINDER OF THE CATALYST IN THE SYSTEM.
Claim 2
Dependent Claim
203 words
IN A CATALYTIC CONVERSION SYSTEM IN WHICH A POWDERED CATALYST CONSISTING OF FINELY DIVIDED PARTICLES OF DIFFERENT SIZES LESS THAN ABOUT 300 MICRONS IN DIAMETER IS RECYCLED THROUGH A CONVERSION ZONE, AND IN WHICH SUSPENDED CATALYST RANGING ESSENTIALLY FROM A FRACTION OF A MICRON DIAMETER UP TO ABOUT 20 MICRONS DIAMETER IS SEPARATED AND RECOVERED FOR REUSE FROM A GAS OR VAPOR STREAM LEAVING THE SYSTEM BY MEANS OF AN ELECTRICAL PRECIPITATOR, AND IN WHICH THE DECLINE IN THE ACTIVELY OF THE CATALYST IN THE SYSTEM WITH USE IN COUNTERACTED BY CONTINUALLY REPLENISHING THE CATALYST WITH MORE ACTIVE CATALYST, THE IMPROVEMENT WHICH COMPRISES WITHDRAWING A PORTION OF SAID POWDERED CATALYST CONSISTING OF FINELY DIVIDED PARTICLES LESS THAN ABOUT 300 MICRONS IN DIAMETER AND HAVING SUBSTANTIALLY THE SAME PARTICLE SIZE DISTRIBUTION AS THE SAID CATALYST IN THE SYSTEM, GRINDING SAID WITHDRAWN PORTION OF THE CATALYST TO THE INCREASE THE PROPORTION OF PARTICLES RANGING ESSENTIALLY FROM A FRACTION OF A MICRON DIAMETER UP TO ABOUT 20 MICRONS DIAMETER THEREIN, AND RECOMBINING THE TOTAL PORTION OF CATALYST SO TREATED, INCLUDING THE MATERIAL RANGING ESSENTIALLY FROM A FRACTION OF A MICRON DIAMETER UP TO ABOUT 20 MICRONS DIAMETER, WITH THE REMAINDER OF THE CATALYST IN THE SYSTEM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |