US2666736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of n-propyl and sec. butyl alcohols by azeotropic distillation
Assignee: Celanese Corp
•
Filing: 1950-06-09
•
Granted: 1954-01-19
•
Expires: 1970-06-09
Abstract
No abstract record available.
Inventors
- 👤 Nat C Robertson
- 👤 James W Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:03
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
PROCESS FOR THE SEPARATION BY DISTILLATION OPERATIONS OF A CRUDE MIXTURE OF ALCOHOLS INCLUDING N-PROPYL AND SECONDARY BUTYL ALCOHOL, WHICH COMPRISES ADDING WATER AND AN AZEOTROPING AGENT, SELECTED FROM THE GROUP CONSISTING OF CYCLOHEXANE AND METHYLCYCLOHEXANE, TO THE CRUDE MIXTURE, DISTILLING THE RESULTING MIXTURE OF FORM A TERNARY AZEOTROPE COMPRISING WATER, N-PROPYL ALCOHOL AND THE AZEOTROPING AGENT, CONDENSING THE TERNARY AZEOTROPE, DECANTING THE AQUEOUS LAYER FORMED ON CONDENSATION OF SAID TERNARY AZEOTROPE, AND DISTILLING THE AQUEOUS LAYER TO OBTAIN PURIFIED N-PROPYL ALCOHOL.
Claim 2
Dependent Claim
82 words
PROCESS FOR THE SEPARATION BY DISTILLATION OPERATIONS OF A CRUDE MIXTURE OF ALCOHOLS INCLUDING N-PROPYL AND SECONDARY BUTYL ALCOHOL, WHICH COMPRISES ADDING WATER AND AN AZEOTROPING AGENT, SELECTED FROM THE GROUP CONSISTING OF CYCLOHEXANE AND METHYLCYCLOHEXANE, TO THE CRUDE MIXTURE, DISTILLING THE RESULTING MIXTURE OF FORM A TERNARY AZEOTROPE COMPRISING WATER, N-PROPYL ALCOHOL AND THE AZEOTROPING AGENT, CONDENSING THE TERNARY AZEOTROPE, DECANTING THE AQUEOUS LAYER FORMED ON CONDENSATION OF SAID TERNARY AZEOTROPE, AND DISTILLING THE AQUEOUS LAYER TO OBTAIN PURIFIED N-PROPYL ALCOHOL.
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |