Patent US2581789A successfully refreshed from Google Patents.
US2581789A
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Azeotropic distillation of methanol and acetone with hexane
Assignee: Millennium Petrochemicals Inc
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Filing: 1949-04-11
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Granted: 1952-01-08
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Expires: 1969-04-11
Abstract
No abstract record available.
Inventors
- 👤 Sylvan E Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:48
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/82; C07C29/86; C07C45/00; C07C45/78; C07C45/80; C07C45/81; C07C45/82; C07C45/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE METHOD OF SEPARATING ACETONE FROM METHANOL, WHERE THE TWO ARE PRESENT IN ADMIXTURE, COMPRISING MIXING THE SAID ADMIXTURE WITH HEXANE, DISTILLING THE RESULTANT MIXTURE WITH REFLUXING AT A HEAD TEMPERATURE OF 47* C. AND SEPARATING OUT AN OVERHEAD FRACTION COMPOSED OF METHANOL, ACETONE AND HEXANE AND A RESIDUAL FRACTION COMPOSED OF A SUBSTANTIALLY PURE CONSTITUENT OF THE INITIAL ADMIXTURE.
Claim 2
Independent Claim
60 words
THE METHOD OF SEPARATING ACETONE FROM METHANOL, WHERE THE TWO ARE PRESENT IN ADMIXTURE, COMPRISING MIXING THE SAID ADMIXTURE WITH HEXANE, DISTILLING THE RESULTANT MIXTURE WITH REFLUXING AT A HEAD TEMPERATURE OF 47* C. AND SEPARATING OUT AN OVERHEAD FRACTION COMPOSED OF METHANOL, ACETONE AND HEXANE AND A RESIDUAL FRACTION COMPOSED OF A SUBSTANTIALLY PURE CONSTITUENT OF THE INITIAL ADMIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |