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US3629343A
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Process for the production of alkylene glycols
Assignee: VNII NEFTEKHIM PROTSESSOV
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Filing: 1968-10-11
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Granted: 1971-12-21
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Expires: 1988-10-11
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF ALKYLENE GLYCOLS BY THE CATALYTIC HYDRATION OF ALKYLENE OXIDES IN THE PRESENCE OF CARBON DIOXIDE UNDER A PRESSURE OF 10-180 ATM. AND AT A TEMPERATURE 80-220*C., EMPLOYING AS CATALYST ALKALI METAL HALIDES AND COMPOUNDS OF THE FORMULA R1-N(+)(-R2)(-R3)-R4 X(-) WHEREIN R1, R2, R3 AND R4 ARE HYDROGEN OR ALKYL, AND X IS CHLORINE, BROMINE OR IODINE.
Inventors
- 👤 Semen Zakharovich Levin
- 👤 Aron Leibovich Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:42
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/09; C07C29/10; C07C29/103; C07C29/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |