US3330878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing styrene
Assignee: Halcon Research and Development Corp
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Filing: 1964-06-15
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Granted: 1967-07-11
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Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Harold A Huckins
- 👤 Gilman Harold
- 👤 Theodore W Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:41
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/321; C07C5/327; C07C5/333; C07C5/3332
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN A PROCESS FOR CATALYTICALLY DEHYDROGENATING AN ETHYL BENZENE FEED CONTAINING AT LEAST 80% ETHYL BENZENE AT A TEMPERATURE BETWEEN 550*C. AND 675*C. IN THE PRESENCE OF STEAM TO PRODUCE STYRENE, WHEREIN A PLURALITY OF RECATION STAGES ARE EMPOLYED, THE IMPROVEMENT WHICH COMPRISES: PASSING THE REACTION EFFLUENT TO AN INDIRECT HEATER BETWEEN SAID STAGES FOR A RESIDENCE TIME OF LESS THAN 5 SECONDS, A MAXIMUM PRESSURE DROP OF 10 P.S.I. ACROSS THE HEAT EXCHANGER, AND A MAXIMUM SHIN TEMPERATURE OF 790*C.
Claim 2
Dependent Claim
81 words
IN A PROCESS FOR CATALYTICALLY DEHYDROGENATING AN ETHYL BENZENE FEED CONTAINING AT LEAST 80% ETHYL BENZENE AT A TEMPERATURE BETWEEN 550*C. AND 675*C. IN THE PRESENCE OF STEAM TO PRODUCE STYRENE, WHEREIN A PLURALITY OF RECATION STAGES ARE EMPOLYED, THE IMPROVEMENT WHICH COMPRISES: PASSING THE REACTION EFFLUENT TO AN INDIRECT HEATER BETWEEN SAID STAGES FOR A RESIDENCE TIME OF LESS THAN 5 SECONDS, A MAXIMUM PRESSURE DROP OF 10 P.S.I. ACROSS THE HEAT EXCHANGER, AND A MAXIMUM SHIN TEMPERATURE OF 790*C.
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) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |