US3084108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating ethylbenzene from styrene by low pressure drop distillation
Assignee: Cosden Petroleum Corp
•
Filing: 1958-01-17
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Granted: 1963-04-02
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Expires: 1978-01-17
Abstract
No abstract record available.
Inventors
- 👤 George A Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:52
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF SEPARATING ETHYL BENZENE FROM STYRENE IN A MANNER TO PREVENT STYRENE POLYMERIZATION, COMPRISING DISTILLING THE MIXTURE IN A MULTI-STAGE COLUMN HAVING BETWEEN 80 AND 100 LOW PRESSURE FROP STAGES, AT A TOP PRESSURE BETWEEN 25 AND 50 MM. HG ABS., THERE BEING A TOTAL PRESSURE DROP FROM THE BOTTOM TO THE TOP OF SAID COLUMN IN THE RANGE OF 75 TO 100 MM. HG ABS., THE ETHYL BENZENE BEING WITHDRAWN AT A TOP COLUMN TEMPERATURE IN THE RANGE OF 118 TO 128*F. AND STYRENE BEING WITHDRAWN AT A BOTTOM COLUMN TEMPERATURE OF ABOUT 165 TO 215*F. AND AT A BOTTOM PRESSURE IN THE RANGE OF 100 TO 150 MM. HG ABS., THE SEPARATED ETHYL BENZENE OVERHEAD BEING SUBSTANTIALLY FREE OF STYRENE AND THE STYRENE BEING SUBSTANTIALLY FREE FROM ETHYL BENZENE.
Claim 2
Independent Claim
133 words
THE METHOD OF SEPARATING ETHYL BENZENE FROM STYRENE IN A MANNER TO PREVENT STYRENE POLYMERIZATION, COMPRISING DISTILLING THE MIXTURE IN A MULTI-STAGE COLUMN HAVING BETWEEN 80 AND 100 LOW PRESSURE FROP STAGES, AT A TOP PRESSURE BETWEEN 25 AND 50 MM. HG ABS., THERE BEING A TOTAL PRESSURE DROP FROM THE BOTTOM TO THE TOP OF SAID COLUMN IN THE RANGE OF 75 TO 100 MM. HG ABS., THE ETHYL BENZENE BEING WITHDRAWN AT A TOP COLUMN TEMPERATURE IN THE RANGE OF 118 TO 128*F. AND STYRENE BEING WITHDRAWN AT A BOTTOM COLUMN TEMPERATURE OF ABOUT 165 TO 215*F. AND AT A BOTTOM PRESSURE IN THE RANGE OF 100 TO 150 MM. HG ABS., THE SEPARATED ETHYL BENZENE OVERHEAD BEING SUBSTANTIALLY FREE OF STYRENE AND THE STYRENE BEING SUBSTANTIALLY FREE FROM ETHYL BENZENE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |