US2531112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration of hydrofluoric acid catalyst
Assignee: California Research LLC
•
Filing: 1947-06-02
•
Granted: 1950-11-21
•
Expires: 1967-06-02
Abstract
No abstract record available.
Inventors
- 👤 Thonet C Dauphine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:27
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR THE RECOVERY OF SUBSTANTIALLY WATER-FREE HYDROFLUORIC ACID FROM A SPENT BENZENE ALKYLATION CATALYST CONTAINING A MIXTURE OF HYDROFLUORIC ACID, WATER AND ACID OIL, WHICH COMPRISES PREHEATING SAID SPENT CATALYST MIXTURE TO A TEMPERATURE OF AT LEAST ABOVE THE BOILING POINT OF BENZENE, INTRODUCING A STREAM OF VAPORIZED BENZENE INTO SAID SPENT CATALYST MIXTURE, AND WITHDRAWING THEREFROM SAID VAPORIZED BENZENE HAVING ENTRAINED THEREIN WATER-FREE HYDROFLUORIC ACID.
Claim 2
Dependent Claim
68 words
A PROCESS FOR THE RECOVERY OF SUBSTANTIALLY WATER-FREE HYDROFLUORIC ACID FROM A SPENT BENZENE ALKYLATION CATALYST CONTAINING A MIXTURE OF HYDROFLUORIC ACID, WATER AND ACID OIL, WHICH COMPRISES PREHEATING SAID SPENT CATALYST MIXTURE TO A TEMPERATURE OF AT LEAST ABOVE THE BOILING POINT OF BENZENE, INTRODUCING A STREAM OF VAPORIZED BENZENE INTO SAID SPENT CATALYST MIXTURE, AND WITHDRAWING THEREFROM SAID VAPORIZED BENZENE HAVING ENTRAINED THEREIN WATER-FREE HYDROFLUORIC ACID.
References Cited (Backward Citations)
US2423470A
Cited
US2232117A
Cited
US2468756A
Cited
US2408933A
Cited
US2417875A
Cited
US2425752A
Cited
US2404340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |