US4045500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethylene glycol
Assignee: Halcon Research and Development Corp
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Filing: 1976-05-28
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Granted: 1977-08-30
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Expires: 1996-05-28
Abstract
Abstract Ethylene glycol is prepared in an oxidation zone by the reaction of ethylene, molecular oxygen, and water in the presence of an iodine source to produce a liquid reaction product which is separated into a lower-boiling portion, a glycol fraction and a higher-boiling portion and the higher-boiling portion is recycled to the oxidation zone together with part of the lower-boiling portion.
Inventors
- 👤 Olav T. Onsager
- 👤 Peter L. Szecsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:41
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A process for preparing ethylene glycol, which comprises reacting ethylene, molecular oxygen and water in the presence of an iodine source in an oxidation zone at a temperature of 50° - 250° C. and under a pressure sufficient to maintain the liquid phase to produce a liquid reaction product, separating said product into a plurality of portions, including a higher-boiling portion and a product ethylene glycol portion, and recycling said higher-boiling portion to said oxidation zone.
Claim 2
Dependent Claim
76 words
A process for preparing ethylene glycol, which comprises reacting ethylene, molecular oxygen and water in the presence of an iodine source in an oxidation zone at a temperature of 50° - 250° C. and under a pressure sufficient to maintain the liquid phase to produce a liquid reaction product, separating said product into a plurality of portions, including a higher-boiling portion and a product ethylene glycol portion, and recycling said higher-boiling portion to said oxidation zone.
Claim 3
Dependent Claim
24 words
A process as defined in claim 1, wherein said portions include a lower-boiling portion and said lower-boiling portion is treated to remove acetaldehyde therefrom.
Claim 4
Dependent Claim
20 words
A process as defined in claim 2, wherein said lower-boiling portion after said treatment is recycled to said oxidation zone.
Claim 5
Dependent Claim
47 words
A process as defined in claim 1, wherein said portions include a lower-boiling portion, and said process further comprises treating said lower-boiling portion to remove acetaldehyde therefrom, recycling said lower-boiling portion to said oxidation zone, recovering said ethylene glycol as product, and recovering said acetaldehyde as co-product.
References Cited (Backward Citations)
US3928474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |