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US3775510A
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US
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Refrigerating cooled recycled isobutane in alkylation
Assignee: Phillips Petroleum Co
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Filing: 1970-08-06
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Granted: 1973-11-27
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Expires: 1990-08-06
Abstract
Abstract AT LEAST A PORTION OF RECYCLE ISOPARAFFIN, E.G., ISOBUTANE IS TREATED IN AN ALKYLATION OPERATION, E.G., ISOPARAFFIN-OLEFIN ALKYLATION TO REMOVE SUBSTANTIALLY THE HYDROGEN FLUORIDE THEFROM AND IS THE RETURNED TO THE ALKYLATION OPERATION. IN ONE EMBODIMENT HYDROCARBON PHASE FROM HF SETTLER IS CHARGED TO A FRACTIONATION FROM WHICH ALKYLATE IS REMOVED AS BOTTOM, AN OVERHEAD IS SPLIT INTO AT LEAST TWO STREAMS, A STREAM CONTAINING SOME PROPANE TO AVOID PROPANE BUILDUP AND ANOTHER STREAM FROM WHICH HF IS REMOVED AS BY REFRIGERATION WHEREUPON THE LATTER STREAM CONTAINING A SUBSTANTIALLY REDUCED HF IS RECYCLED TO ALKYLATION.
Inventors
- 👤 T Hutson
- 👤 C Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:59
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |