Patent US2775623A successfully refreshed from Google Patents.
US2775623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolation of ethylene glycol fro
Assignee: —
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Filing: —
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Granted: 1956-12-25
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Expires: 1973-12-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:36
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/09; C07C29/10; C07C29/103; C07C29/106; C07C29/132; C07C31/00; C07C31/18; C07C31/20; C07C31/202; C07C31/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE PROCESS OF ISOLATING ETHYLENE GLYCOL FROM A MIXTURE OF IT WITH PROPYLENE GLYCO-1,2, WHICH COMPRISES, HEATING THE MIXTURE IN THE PRESENCE OF AN ACID DEHYDRATION CATALYST CAPABLE OF CATALYZING THE DEHYDRATION OF PROPYLENE GLYCOL-1,2 AT A TEMPERATURE NOT EXCEEDING ABOUT 160* C. BUT SUFFICIENT TO DRIVE OFF FROM THE REACTION MIXTURE THE WATER, PROPIONALDEHYDE AND 2,6-DIMETHYL-1,4DIOXANE FORMED DURING THE COURSE OF THE REACTION, DISCONTINUING THE HEATING WHEN SUBSTANTIALLY ALL OF THE PROPYLENE GLYCOL-1,2 HAS BEEN DECOMPOSED, AND REMOVING ETHYLENE GLYCOL FROM THE RESULTANT REACTION MIXTURE.
Claim 2
Dependent Claim
86 words
THE PROCESS OF ISOLATING ETHYLENE GLYCOL FROM A MIXTURE OF IT WITH PROPYLENE GLYCO-1,2, WHICH COMPRISES, HEATING THE MIXTURE IN THE PRESENCE OF AN ACID DEHYDRATION CATALYST CAPABLE OF CATALYZING THE DEHYDRATION OF PROPYLENE GLYCOL-1,2 AT A TEMPERATURE NOT EXCEEDING ABOUT 160* C. BUT SUFFICIENT TO DRIVE OFF FROM THE REACTION MIXTURE THE WATER, PROPIONALDEHYDE AND 2,6-DIMETHYL-1,4DIOXANE FORMED DURING THE COURSE OF THE REACTION, DISCONTINUING THE HEATING WHEN SUBSTANTIALLY ALL OF THE PROPYLENE GLYCOL-1,2 HAS BEEN DECOMPOSED, AND REMOVING ETHYLENE GLYCOL FROM THE RESULTANT REACTION MIXTURE.
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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |