US3265593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of acetaldehyde from ethylene oxide by extractive distillation
Assignee: Union Carbide Corp
•
Filing: 1962-10-08
•
Granted: 1966-08-09
•
Expires: 1982-10-08
Abstract
No abstract record available.
Inventors
- 👤 Donald G Leis
- 👤 Jr Edward J Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR EFFECTING THE REMOVAL OF ACETALDEHYDE FROM ETHYLENE OXIDE WHICH COMPRISES CONTACTING ACETALDEHYDE-CONTAMINATED ETHYLENE OXIDE WITH AN EXTRACTANT WHICH IS NORMALLY LIQUID ORGANIC COMPOUND UNDER THE EXTRACTIVE DISTILLATION CONDITIONS, SAID EXTRACTANT (A) BEING COMPOSED OF CARBON, HYDROGEN AND OXYGEN ATOMS, (B) BEING MIXCIBLE WITH ACETALDEHYDE AND ETHYLENE OXIDE BUT BEING ESSENTIALLY INERT TO ETHYLENE OXIDE AT SAID EXTRACTIVE DISTILLATION CONDITIONS, AND (C) HAVING A BOILING POINT WITHIN THE RANGE OF FROM ABOUT 65*C. TO ABOUT 200*C. AT ATMOSPHERIC PRESSURE, SUBJECTING THE RESULTING MIXTURE TO EXTRACTIVE DISTILLATION IN A DISTILLATION ZONE UNDER OPERATING CONDITIONS WHEREBY ETHYLENE OXIDE HAVING SUBSTANTIALLY REDUCED ACETALDEHYDE CONTENT IS REMOVED FROM THE UPPER SECTION OF SAID DISTILLATION ZONE IN THE VAPOR STATE ESSENTIALLY FREE FROM THE EXTRACTANT.
Claim 2
Dependent Claim
122 words
A PROCESS FOR EFFECTING THE REMOVAL OF ACETALDEHYDE FROM ETHYLENE OXIDE WHICH COMPRISES CONTACTING ACETALDEHYDE-CONTAMINATED ETHYLENE OXIDE WITH AN EXTRACTANT WHICH IS NORMALLY LIQUID ORGANIC COMPOUND UNDER THE EXTRACTIVE DISTILLATION CONDITIONS, SAID EXTRACTANT (A) BEING COMPOSED OF CARBON, HYDROGEN AND OXYGEN ATOMS, (B) BEING MIXCIBLE WITH ACETALDEHYDE AND ETHYLENE OXIDE BUT BEING ESSENTIALLY INERT TO ETHYLENE OXIDE AT SAID EXTRACTIVE DISTILLATION CONDITIONS, AND (C) HAVING A BOILING POINT WITHIN THE RANGE OF FROM ABOUT 65*C. TO ABOUT 200*C. AT ATMOSPHERIC PRESSURE, SUBJECTING THE RESULTING MIXTURE TO EXTRACTIVE DISTILLATION IN A DISTILLATION ZONE UNDER OPERATING CONDITIONS WHEREBY ETHYLENE OXIDE HAVING SUBSTANTIALLY REDUCED ACETALDEHYDE CONTENT IS REMOVED FROM THE UPPER SECTION OF SAID DISTILLATION ZONE IN THE VAPOR STATE ESSENTIALLY FREE FROM THE EXTRACTANT.
References Cited (Backward Citations)
US2697104A
Cited
US2514966A
Cited
US2615901A
Cited
US2870866A
Cited
US2810760A
Cited
US2775510A
Cited
US2887498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |