Patent US3256355A successfully refreshed from Google Patents.
US3256355A
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Process for preparing styrene and recovery of ethylbenzene
Assignee: Halcon Research and Development Corp
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Filing: 1965-03-24
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Granted: 1966-06-14
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Expires: 1985-03-24
Abstract
No abstract record available.
Inventors
- 👤 Gilman Harold
- 👤 Joel J Kirman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:09
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/40; C07C15/42; C07C15/44; C07C15/46; C07C7/00; C07C7/04; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y10; Y10S; Y10S585/00; Y10S585/909; Y10S585/911; Y10S585/914
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
IN A PROCESS FOR THE PREPARATION OF STYRENE FROM ETHYL BENZENE WHEREIN THE ETHYL BENZENE IS CATALYTICALLY DEHYDROGENATED IN THE PRESENCE OF STEAM SO AS TO FORM A REACTOR EFFLUENT COMPRISING UNREACTED ETHYL BENZENE, DEHYDROGENATION PRODUCTS THEREOF AND STEAM, THE IMPROVEMENT WHICH COMPRISES: COMPRESSING AT LEAST A PORTION OF SAID REACTOR EFFLUENT SO THAT THE MINIMUM CONDENSATION TEMPERATURE OF SAID STEAM IS FROM 210 TO 240*F., PASSING THE RESULTANT COMPRESSED STREAM TO A REBOILER OF AN ETHYL BENZENE DISTILLATION ZONE; CONDENSING THE STEAM OF SAID STREAM, THEREBY MAINTAINING THE TEMPERATURE OF THE BOTTOMS BETWEEN A TEMPERATURE OF ABOUT 195 TO 235*F.; RECOVERING ETHYL BENZENE AS A DISTILLATE; AND RECYCLING SAID ETHYL BENZEN TO SAID DEHYDROGENATION STEP
References Cited (Backward Citations)
GB797045A
Cited
US2959626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |