Patent US4945128A successfully refreshed from Google Patents.
US2981771A
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Regeneration of spent adsorbent
Assignee: D-X Sunray Oil Co
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Filing: 1959-07-24
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Granted: 1961-04-25
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Expires: 1979-07-24
Abstract
No abstract record available.
Inventors
- 👤 Victor L Brant
- 👤 Madeleine G Morgan
- 👤 David L Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:15
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; B01J20/08; B01J20/30; B01J20/34; B01J20/3433; B01J20/345; B01J20/3458; B01J20/3466; B01J20/3475; B01J20/3483; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/054
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A PROCESS FOR THE ALKYLATION OF AN ISOPARAFFIN WITH AN OLEFIN IN THE PRESENCE OF SULFURIC ACID IN WHICH THE RESULTING ALKYLATE PRODUCT IS PASSED THROUGH ALUMINA FOR THE REMOVAL OF SULFUR-CONTAINING CONTAMINANTS, THE IMPROVEMENTS COMPRISING REGENERATING ALUMINA SPENT BY ADSORBING SAID CONTAMINANTS BY CONTACTING THE SAME WITH WATER AT A TEMPERATURE OF ABOUT 40*F. TO ABOUT 210*F. FOR A PERIOD OF ABOUT 15 MINUTES TO ABOUT 20 HOURS, TREATING THE WASHED ALUMINA WITH A STEAM AT A TEMPERATURE OF ABOUT 220*F. TO ABOUT 500*F. FOR ABOUT .5 TO 15 HOURS, AND TREATING THE STEAM-TREATED ALUMINA WITH AN INERT GAS AT A TEMPERATURE OF ABOUT 200*F. TO ABOUT 1000*F. FOR A PERIOD OF ABOUT 1 TO 30 HOURS.
Claim 2
Dependent Claim
119 words
IN A PROCESS FOR THE ALKYLATION OF AN ISOPARAFFIN WITH AN OLEFIN IN THE PRESENCE OF SULFURIC ACID IN WHICH THE RESULTING ALKYLATE PRODUCT IS PASSED THROUGH ALUMINA FOR THE REMOVAL OF SULFUR-CONTAINING CONTAMINANTS, THE IMPROVEMENTS COMPRISING REGENERATING ALUMINA SPENT BY ADSORBING SAID CONTAMINANTS BY CONTACTING THE SAME WITH WATER AT A TEMPERATURE OF ABOUT 40*F. TO ABOUT 210*F. FOR A PERIOD OF ABOUT 15 MINUTES TO ABOUT 20 HOURS, TREATING THE WASHED ALUMINA WITH A STEAM AT A TEMPERATURE OF ABOUT 220*F. TO ABOUT 500*F. FOR ABOUT .5 TO 15 HOURS, AND TREATING THE STEAM-TREATED ALUMINA WITH AN INERT GAS AT A TEMPERATURE OF ABOUT 200*F. TO ABOUT 1000*F. FOR A PERIOD OF ABOUT 1 TO 30 HOURS.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |