Patent US2688633A successfully refreshed from Google Patents.
US2688633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonation of alkyl aromatic hydrocarbons
Assignee: Standard Oil Development Co
•
Filing: 1950-07-28
•
Granted: 1954-09-07
•
Expires: 1970-07-28
Abstract
No abstract record available.
Inventors
- 👤 Charles A Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:46
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/29; C07C309/30; C07C309/31; C07C7/00; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN THE PRODUCTION OF A COLORLESS, ODORLESS AND OIL-FREE ALKYL ARYL SULFONIC ACID BY THE SULFONATION OF AN ALKYL ARYL HYDROCARBON PRODUCED BY THE ALKYLATION OF AN AROMATIC HYDROCARBON BY AN OLEFIN IN THE PRESENCE OF AN ALKYLATION CATALYST, THE IMPROVEMENT WHICH COMPRISES TREATING SAID ALKYL ARYL HYDROCARBON HAVING FROM 10 TO 18 CARBON ATOMS IN THE ALKYL CHAIN AND CONTAINING OLEFINIC AND POLYMERIC IMPURITIES WITH 90-98 WEIGHT PER CENT SULFURIC ACID TO SULFONATE THE IMPURITIES SUBSTANTIALLY COMPLETELY WITHOUT SULFONATING THE ALKYL ARYL HYDROCARBON, SEPARATING THE RESULTING SLUDGE, REMOVING SO2 FROM THE ACID-TREATED HYDROCARBON, CONTACTING THE ACIDTREATED HYDROCARBON WITH A SORBENT MATERIAL, SEPARATING A PURIFIED ALKYL ARYL HYDROCARBON FROM THE SORBENT MATERIAL AND SULFONATING THE PURIFIED ALKYL ARYL HYDROCARBON TO PRODUCE A COLORLESS, ODORLES AND OIL-FREE ALKYL ARYL SULFONIC ACID.
Claim 2
Dependent Claim
130 words
IN THE PRODUCTION OF A COLORLESS, ODORLESS AND OIL-FREE ALKYL ARYL SULFONIC ACID BY THE SULFONATION OF AN ALKYL ARYL HYDROCARBON PRODUCED BY THE ALKYLATION OF AN AROMATIC HYDROCARBON BY AN OLEFIN IN THE PRESENCE OF AN ALKYLATION CATALYST, THE IMPROVEMENT WHICH COMPRISES TREATING SAID ALKYL ARYL HYDROCARBON HAVING FROM 10 TO 18 CARBON ATOMS IN THE ALKYL CHAIN AND CONTAINING OLEFINIC AND POLYMERIC IMPURITIES WITH 90-98 WEIGHT PER CENT SULFURIC ACID TO SULFONATE THE IMPURITIES SUBSTANTIALLY COMPLETELY WITHOUT SULFONATING THE ALKYL ARYL HYDROCARBON, SEPARATING THE RESULTING SLUDGE, REMOVING SO2 FROM THE ACID-TREATED HYDROCARBON, CONTACTING THE ACIDTREATED HYDROCARBON WITH A SORBENT MATERIAL, SEPARATING A PURIFIED ALKYL ARYL HYDROCARBON FROM THE SORBENT MATERIAL AND SULFONATING THE PURIFIED ALKYL ARYL HYDROCARBON TO PRODUCE A COLORLESS, ODORLES AND OIL-FREE ALKYL ARYL SULFONIC ACID.
References Cited (Backward Citations)
US2158680A
Cited
US2297292A
Cited
US2261206A
Cited
US2364782A
Cited
US2422926A
Cited
US2413161A
Cited
US2448184A
Cited
US2509863A
Cited
US2479120A
Cited
US2439457A
Cited
US2567854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |