US2581065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying isobutylene by sulfuric acid extraction
Assignee: Standard Oil Development Co
•
Filing: 1948-07-07
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Granted: 1952-01-01
•
Expires: 1968-07-07
Abstract
No abstract record available.
Inventors
- 👤 Walter A Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:04
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR THE PRODUCTION OF ISOBUTYLENE WHICH COMPRISES CONTACTING A C4F-HYDROCARBON STREAM CONTAINING ISOBUTYLENE, NORMAL BUTENES, BUTANES AND BUTADIENE AT A TEMPERATURE OF 60 TO 120* F. AND AT A PRESSURE OF 80 TO 150 P.S.I.G. WITH AN ACID TO FORM AN ISOBUTYLENE ACID EXTRACT, ADDING TERTIARY BUTYL ALCOHOL TO THE EXTRACT IN A VENT DRUM WHILE STILL UNDER PRESSURE, REDUCING THE PRESSURE ON THE EXTRACT TO APPROXIMATELY 1 TO 14 P.S.I. ABSOLUTE, WHEREBY PHYSICALLY DISSOLVED AND MECHANICALLY ENTRAINED HYDROCARBONS, INCLUDING NORMAL BUTENES, BUTANES AND BUTADIENE, ARE RELEASED FROM THE EXTRACT, AND THEREAFTER RECOVERING ISOBUTYLENE FROM THE ACID EXTRACT.
Claim 2
Dependent Claim
100 words
A PROCESS FOR THE PRODUCTION OF ISOBUTYLENE WHICH COMPRISES CONTACTING A C4F-HYDROCARBON STREAM CONTAINING ISOBUTYLENE, NORMAL BUTENES, BUTANES AND BUTADIENE AT A TEMPERATURE OF 60 TO 120* F. AND AT A PRESSURE OF 80 TO 150 P.S.I.G. WITH AN ACID TO FORM AN ISOBUTYLENE ACID EXTRACT, ADDING TERTIARY BUTYL ALCOHOL TO THE EXTRACT IN A VENT DRUM WHILE STILL UNDER PRESSURE, REDUCING THE PRESSURE ON THE EXTRACT TO APPROXIMATELY 1 TO 14 P.S.I. ABSOLUTE, WHEREBY PHYSICALLY DISSOLVED AND MECHANICALLY ENTRAINED HYDROCARBONS, INCLUDING NORMAL BUTENES, BUTANES AND BUTADIENE, ARE RELEASED FROM THE EXTRACT, AND THEREAFTER RECOVERING ISOBUTYLENE FROM THE ACID EXTRACT.
References Cited (Backward Citations)
USRE22268E
Cited
US2014078A
Cited
US2431005A
Cited
US2400376A
Cited
US2400340A
Cited
US2456260A
Cited
US2497191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |