Patent US2670391A successfully refreshed from Google Patents.
US2670391A
Expired / Lapsed
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Recovery of ethylene
Assignee: Standard Oil Co
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Filing: 1951-06-29
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Granted: 1954-02-23
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Expires: 1971-06-29
Abstract
No abstract record available.
Inventors
- 👤 Arthur P Lien
- 👤 Carl E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:18
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A PROCESS OF RECOVERING SUBSTANTIALLY PURE ETHYLENE FROM A GAS CONTAINING ETHYLENE, PROPYLENE, AND OTHER CONSTITUENTS BOILING WITHIN SUBSTANTIALLY THE SAME TEMPERATURE RANGE, THE SAID PROCESS COMPRISING: SCRUBBING THE SAID GAS WITH A SULFONIC ACID THAT HAS AN ACIDITY SUBSTANTIALLY EQUIVALENT TO THAT OF A LOW-MOLECULAR WEIGHT ALKANESULFONIC ACID IN AT LEAST 90 WEIGHT PERCENT CONCENTRATION WHILE MAINTAINING A TEMPERATURE BETWEEN 20* AND 120* C. AND EFFECTING REMOVAL OF PROPYLENE FROM THE GAS; PASSING SUBSTANTIALLY PROPYLENE-FREE GAS FROM THE SAID SCRUBBING STEP INTO DIRECT CONTACT WITH A SULFONIC ACID CONTAINING FROM 0.5 TO 50 MOL PERCENT, BASED ON THE ACID, OF BORON TRIFLUORIDE AT A TEMPERATURE BELOW ABOUT 75* C., AND ESTERIFYING ETHYLENE CONTAINED IN THE GAS; REMOVING THE SO-FORMED ETHYL ESTER FROM THE GAS; STRIPPING BORON TRIFLUORIDE FROMTHE ESTER AT A TEMPERATURE BELOW 80* C.; AND HEATING THE ETHYL ESTER, FREE OF BORON TRIFLUORIDE, TO A TEMPERATURE BETWEEN ABOUT 150* AND 250* C. THEREBY LIBERATING SUBSTANTAILLY PURE ETHYLENE.
Claim 2
Dependent Claim
159 words
A PROCESS OF RECOVERING SUBSTANTIALLY PURE ETHYLENE FROM A GAS CONTAINING ETHYLENE, PROPYLENE, AND OTHER CONSTITUENTS BOILING WITHIN SUBSTANTIALLY THE SAME TEMPERATURE RANGE, THE SAID PROCESS COMPRISING: SCRUBBING THE SAID GAS WITH A SULFONIC ACID THAT HAS AN ACIDITY SUBSTANTIALLY EQUIVALENT TO THAT OF A LOW-MOLECULAR WEIGHT ALKANESULFONIC ACID IN AT LEAST 90 WEIGHT PERCENT CONCENTRATION WHILE MAINTAINING A TEMPERATURE BETWEEN 20* AND 120* C. AND EFFECTING REMOVAL OF PROPYLENE FROM THE GAS; PASSING SUBSTANTIALLY PROPYLENE-FREE GAS FROM THE SAID SCRUBBING STEP INTO DIRECT CONTACT WITH A SULFONIC ACID CONTAINING FROM 0.5 TO 50 MOL PERCENT, BASED ON THE ACID, OF BORON TRIFLUORIDE AT A TEMPERATURE BELOW ABOUT 75* C., AND ESTERIFYING ETHYLENE CONTAINED IN THE GAS; REMOVING THE SO-FORMED ETHYL ESTER FROM THE GAS; STRIPPING BORON TRIFLUORIDE FROMTHE ESTER AT A TEMPERATURE BELOW 80* C.; AND HEATING THE ETHYL ESTER, FREE OF BORON TRIFLUORIDE, TO A TEMPERATURE BETWEEN ABOUT 150* AND 250* C. THEREBY LIBERATING SUBSTANTAILLY PURE ETHYLENE.
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) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |