US2651604A
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
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:11
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR THE RECOVERY OF ACETIC ACID FROM AQUEOUS SOLUTIONS TO ACETIC ACID WHICH COMPRISES ADDING A DIMENTOXY POLYGLYCOL CHOSEN FROM THE CLASS CONSISTING OF DIMETHOXY TETRAETHYLENE GLYCOL, DIMETHOXY TRIETHYLENE GLYCOL AND DIMETHOXY, DIETHYLENE GLYCOL TO THE SOLUTION, FRACTIONALLY DISTILLING FROM THE MIXURE SUBSTANTIALLY ALL THE WATER PRESENT AND THEN RECOVERING ACETIC ACID FROM THE RESIDUAL MIXTURE OF ACETIC ACID AND DIMETHOXY POLYGLYCOL.
Claim 2
Dependent Claim
64 words
A PROCESS FOR THE RECOVERY OF ACETIC ACID FROM AQUEOUS SOLUTIONS TO ACETIC ACID WHICH COMPRISES ADDING A DIMENTOXY POLYGLYCOL CHOSEN FROM THE CLASS CONSISTING OF DIMETHOXY TETRAETHYLENE GLYCOL, DIMETHOXY TRIETHYLENE GLYCOL AND DIMETHOXY, DIETHYLENE GLYCOL TO THE SOLUTION, FRACTIONALLY DISTILLING FROM THE MIXURE SUBSTANTIALLY ALL THE WATER PRESENT AND THEN RECOVERING ACETIC ACID FROM THE RESIDUAL MIXTURE OF ACETIC ACID AND DIMETHOXY POLYGLYCOL.
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 |