US2831020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for producing anhydrous aromatic sulfonic acids with low sulfone content and the products thereof
Assignee: Tennessee Corp
•
Filing: 1954-09-03
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Granted: 1958-04-15
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Expires: 1974-09-03
Abstract
No abstract record available.
Inventors
- 👤 Samuel L Norwood
- 👤 Thomas W Sauls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:42
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR THE SULFONATION OF AROMATIC HYDROCARBONS OF PRODUCE AROMATIC HYDROCARBON SULFONIC ACIDS WHILE INHIBITING THE FORMATION OF SULFONES WHICH COMPRISES SULFONATING AN AROMATIC HYDROCARBON WITH SULFUR TRIOXIDE DISSOLVED IN LIQUID SULFUR DIOXIDE, WHILE ADDING TO THE SULFONATION REACTION NOT MORE THAN 2% BY WEIGHT BASED ON THE SULFONIC ACID TO BE FORMED OF A CARBOXYLIC ACID, SELECTED FROM THE GROUP CONSISTING OF ACETIC ACID, MALONIC ACID, AZELAIC ACID, AND BENZOIC ACID, THE SULFONATION BEING PERFORMED AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF ABOUT -9*C., AND AFTER THE SULFONATION REACTION IS COMPLETED INCREASING THE TEMPERATURE OF THE SULFONATION MASS TO EVAPORATE SULFUR DIOXIDE THEREFROM.
Claim 2
Dependent Claim
106 words
A PROCESS FOR THE SULFONATION OF AROMATIC HYDROCARBONS OF PRODUCE AROMATIC HYDROCARBON SULFONIC ACIDS WHILE INHIBITING THE FORMATION OF SULFONES WHICH COMPRISES SULFONATING AN AROMATIC HYDROCARBON WITH SULFUR TRIOXIDE DISSOLVED IN LIQUID SULFUR DIOXIDE, WHILE ADDING TO THE SULFONATION REACTION NOT MORE THAN 2% BY WEIGHT BASED ON THE SULFONIC ACID TO BE FORMED OF A CARBOXYLIC ACID, SELECTED FROM THE GROUP CONSISTING OF ACETIC ACID, MALONIC ACID, AZELAIC ACID, AND BENZOIC ACID, THE SULFONATION BEING PERFORMED AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF ABOUT -9*C., AND AFTER THE SULFONATION REACTION IS COMPLETED INCREASING THE TEMPERATURE OF THE SULFONATION MASS TO EVAPORATE SULFUR DIOXIDE THEREFROM.
References Cited (Backward Citations)
US2706736A
Cited
US2704295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |