US2651605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of acetic acid from aqueous acetic acid solutions by extractive distillation
Assignee: Akzo Nobel UK PLC
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Filing: 1951-11-06
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Granted: 1953-09-08
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Expires: 1971-11-06
Abstract
No abstract record available.
Inventors
- 👤 George A R Hartley
- 👤 Charles O Haughton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; Y; Y10; Y10S; Y10S159/00; Y10S159/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR THE RECOVERY OF ACETIC ACID FROM AQUEOUS SOLUTIONS OF ACETIC ACID COMPRISING ADDING TO THE SOLUTION OF COMPOUND WHICH IS A DERIVATIVE OF A POLYGLYCOL CHOSEN FROM THE GROUP CONSISTING OF METHOXY TRIETHYLENE GLYCOL ACETATE, DIETHYLENE GLYCOL DIACETATE, METHOXY DIETHYLENE GLYCOL ACETATE AND ETHOXY TRIETHYLENE GLYCOL ACETATE, FRACTIONALLY DISTILLING FROM THE MIXTURE SUBSTANTIALLY ALL THE WATER PRESENT AND THEN RECOVERING ACETIC ACID FROM THE RESULTANT MIXTURE OF ACETICE ACID AND THE POLYGLYCOL DERIVATIVE.
Claim 2
Dependent Claim
76 words
A PROCESS FOR THE RECOVERY OF ACETIC ACID FROM AQUEOUS SOLUTIONS OF ACETIC ACID COMPRISING ADDING TO THE SOLUTION OF COMPOUND WHICH IS A DERIVATIVE OF A POLYGLYCOL CHOSEN FROM THE GROUP CONSISTING OF METHOXY TRIETHYLENE GLYCOL ACETATE, DIETHYLENE GLYCOL DIACETATE, METHOXY DIETHYLENE GLYCOL ACETATE AND ETHOXY TRIETHYLENE GLYCOL ACETATE, FRACTIONALLY DISTILLING FROM THE MIXTURE SUBSTANTIALLY ALL THE WATER PRESENT AND THEN RECOVERING ACETIC ACID FROM THE RESULTANT MIXTURE OF ACETICE ACID AND THE POLYGLYCOL DERIVATIVE.
References Cited (Backward Citations)
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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) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |