US2807573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylonitrile by extractive distillation
Assignee: Escambia Chemical Corp
•
Filing: 1954-04-28
•
Granted: 1957-09-24
•
Expires: 1974-04-28
Abstract
No abstract record available.
Inventors
- 👤 Nat C Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:52
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS FOR THE SEPARATION OF A MIXTURE COMPRISING ACRYLONITRILE AND ACETONITRILE WHICH COMPRISES SUBJECTING SAID MIXTURE IN THE PRESENCE OF OXYGEN TO AN EXTRACTIVE DISTILLATION EMPLOYING AS SOLVENT AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT, MAINTAINING THE WATER CONCENTRATION IN THE LIQUID PHASE ABOVE ABOUT 70 MOLE PER-
Claim 2
Dependent Claim
50 words
A PROCESS FOR THE SEPARATION OF A MIXTURE COMPRISING ACRYLONITRILE AND ACETONITRILE WHICH COMPRISES SUBJECTING SAID MIXTURE IN THE PRESENCE OF OXYGEN TO AN EXTRACTIVE DISTILLATION EMPLOYING AS SOLVENT AN AQUEOUS SOLUTION OF AN ALKALI METAL SALT, MAINTAINING THE WATER CONCENTRATION IN THE LIQUID PHASE ABOVE ABOUT 70 MOLE PER-
References Cited (Backward Citations)
US1896158A
Cited
US2177619A
Cited
US2305106A
Cited
US2358193A
Cited
US2382383A
Cited
US2399340A
Cited
US2407861A
Cited
US2415662A
Cited
US2401772A
Cited
US2453472A
Cited
FR949405A
Cited
US2555798A
Cited
US2481080A
Cited
US2562846A
Cited
US2551584A
Cited
US2616838A
Cited
US2548369A
Cited
US2681306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |