US2707165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aldehydes
Assignee: Celanese Corp
•
Filing: 1952-06-24
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Granted: 1955-04-26
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Expires: 1972-06-24
Abstract
No abstract record available.
Inventors
- 👤 Alexander F Maclean
- 👤 Eldred T Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:24
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/85; Y; Y10; Y10S; Y10S203/00; Y10S203/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
PROCESS FOR THE PURIFICATION ACETALDEHYDE CONTAINING UP TO ABOUT 10% OF ETHYLENE OXIDE AS AN IMPURITY, WHICH COMPRISES CONTINOUSLY INTRODUING A STREAM OF SAID IMPURE ACETALDEHYDE INTO AN INTERMEDIATE PORTION OF A DISTILLATION COLUMN, CONTINOUSLY INTRODUCING A STREAM OF AN ACIDIC HYDROLYSIS CATALYST AND WATER INTO SAID INTERMEDIATE PORTION TO HYDROLYZE THE ETHYLENE OXIDE TO ETHYLENE GLYCOL, SAID STREAMS BEING INTRODUCED AT SUCH A RATE THAT THE CONCENTRATION OF ACETALDEHYDE IN THE LIQUID PHASE IN
Claim 2
Dependent Claim
75 words
PROCESS FOR THE PURIFICATION ACETALDEHYDE CONTAINING UP TO ABOUT 10% OF ETHYLENE OXIDE AS AN IMPURITY, WHICH COMPRISES CONTINOUSLY INTRODUING A STREAM OF SAID IMPURE ACETALDEHYDE INTO AN INTERMEDIATE PORTION OF A DISTILLATION COLUMN, CONTINOUSLY INTRODUCING A STREAM OF AN ACIDIC HYDROLYSIS CATALYST AND WATER INTO SAID INTERMEDIATE PORTION TO HYDROLYZE THE ETHYLENE OXIDE TO ETHYLENE GLYCOL, SAID STREAMS BEING INTRODUCED AT SUCH A RATE THAT THE CONCENTRATION OF ACETALDEHYDE IN THE LIQUID PHASE IN
References Cited (Backward Citations)
US2615901A
Cited
US2570217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-25 | 1958-10-25 | 1959-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-25 | 1962-10-25 | 1963-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-25 | 1966-10-25 | 1967-04-26 | $7700.00 | Window Closed / Lapsed |