US2561680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of methanol by azeotropic distillation
Assignee: Cities Service Oil Co
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Filing: 1949-07-20
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Granted: 1951-07-24
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Expires: 1969-07-20
Abstract
No abstract record available.
Inventors
- 👤 Louis G Willke
- 👤 Bernard H Rosen
- 👤 Loyd T Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:01
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/82; C07C29/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE PROCESS OF REFINING CRUDE METHANOL INCLUDING FRACTIONALLY DISTILLING THE CRUDE IN THE PRESENCE OF A HYDROCARBON CONSISTING ESSENTIALLY OF HEPTANE TO DISTILL OVERHEAD SUBSTANTIALLY ALL OF THE METHANOL AS AN AZEOTROPE DISTILLATE, ADDING WATER TO THE DISTILLATE, ALLOWING THE MIXTURE TO SEPARATE BY GRAVITY INTO A TOP LAYER OF HEPTANE AND A BOTTOM AQUEOUS METHANOL LAYER, RETURNNING HEPTANE FROM THE SEPARATED TOP LAYER TO THE DISTILLATE ZONE FOR USE IN CONTINUING TEH AZEOTROPIC SEPARATION OF METHANOL FROM THE CRUDE, FRACTIONALLY DISTILLING THE AQUEOUS METHANOL LAYER TO TAKE OVERHEAD FROM ABOUT 10 TO ABOUT 30 PER CENT OF THE METHANOL, FRACTIONALLY DISTILLING THE OVERHEAD FROM THE LATTER DISTILLATION TO TAKE OVERHEAD FROM ABOUT 3 TO ABOUT 5 PER CENT OF THE METHANOL BASED ON THE ORIGINAL METHANOL CHARGE
Claim 2
Dependent Claim
128 words
THE PROCESS OF REFINING CRUDE METHANOL INCLUDING FRACTIONALLY DISTILLING THE CRUDE IN THE PRESENCE OF A HYDROCARBON CONSISTING ESSENTIALLY OF HEPTANE TO DISTILL OVERHEAD SUBSTANTIALLY ALL OF THE METHANOL AS AN AZEOTROPE DISTILLATE, ADDING WATER TO THE DISTILLATE, ALLOWING THE MIXTURE TO SEPARATE BY GRAVITY INTO A TOP LAYER OF HEPTANE AND A BOTTOM AQUEOUS METHANOL LAYER, RETURNNING HEPTANE FROM THE SEPARATED TOP LAYER TO THE DISTILLATE ZONE FOR USE IN CONTINUING TEH AZEOTROPIC SEPARATION OF METHANOL FROM THE CRUDE, FRACTIONALLY DISTILLING THE AQUEOUS METHANOL LAYER TO TAKE OVERHEAD FROM ABOUT 10 TO ABOUT 30 PER CENT OF THE METHANOL, FRACTIONALLY DISTILLING THE OVERHEAD FROM THE LATTER DISTILLATION TO TAKE OVERHEAD FROM ABOUT 3 TO ABOUT 5 PER CENT OF THE METHANOL BASED ON THE ORIGINAL METHANOL CHARGE
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) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |