Patent US2839588A successfully refreshed from Google Patents.
US2839588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkylene glycol
Assignee: Gulf Oil Corp
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Filing: 1953-12-30
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Granted: 1958-06-17
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Expires: 1973-12-30
Abstract
No abstract record available.
Inventors
- 👤 Almon S Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:26
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR PREPARING A MONO-ALKYLENE GLYCOL SUBSTANTIALLY FREE OF POLY-GLYCOL, THE SAID PROCESS COMPRISING INTRODUCING WATER AND A HYDROLYZABLE ALKYLENE OXIDE HAVING INCLUSIVELY FROM 2 TO 5 CARBON ATOMS PER MOLECULE IN WHICH AT MOST ONE CARBON ATOM SEPARATES THE CARBON ATOMS WHICH ARE LINKED TO THE OXYGEN ATOM, INTO A PLURALITY OF DISTILLATION-REACTION ZONES MAINTAINED AT AN ELEVATED TEMPERATURE AND PRESSURE, EFFECTING HYDROLYSIS OF THE SELECTED ALKYLENE OXIDE IN THE DISTILLATION-REACTION ZONES, DISTILLING UNREACTED ALKYLENE OXIDE AND WATER FROM THE DISTILLATION-REACTION ZONES, FLOWING WATER COUNTERCURRENTLY TO DISTILLATE OXIDE IN SAID ZONES TO PROVIDE AN AQUEOUS BARRIER BETWEEN ZONES IN WHICH OXIDE AND ZONES IN WHICH GLYCOL ARE IN SUBSTANTIAL CONCENTRATION, CONDENSING THE OVERHEAD OXIDE AND WATER VAPOURS, RECYCLING SUBSTANTIALLY YTHE ENTIRE CONDENSATE TO THE DISTILLATION-REACTION ZONES, WITHDRAWING AS DISTILLATE BOTTOMS PRODUCT AN AQUEOUS SOLUTION OF MONO-ALKYLENE GLYCOL FROM THE SAID ZONES.
Claim 2
Dependent Claim
143 words
A PROCESS FOR PREPARING A MONO-ALKYLENE GLYCOL SUBSTANTIALLY FREE OF POLY-GLYCOL, THE SAID PROCESS COMPRISING INTRODUCING WATER AND A HYDROLYZABLE ALKYLENE OXIDE HAVING INCLUSIVELY FROM 2 TO 5 CARBON ATOMS PER MOLECULE IN WHICH AT MOST ONE CARBON ATOM SEPARATES THE CARBON ATOMS WHICH ARE LINKED TO THE OXYGEN ATOM, INTO A PLURALITY OF DISTILLATION-REACTION ZONES MAINTAINED AT AN ELEVATED TEMPERATURE AND PRESSURE, EFFECTING HYDROLYSIS OF THE SELECTED ALKYLENE OXIDE IN THE DISTILLATION-REACTION ZONES, DISTILLING UNREACTED ALKYLENE OXIDE AND WATER FROM THE DISTILLATION-REACTION ZONES, FLOWING WATER COUNTERCURRENTLY TO DISTILLATE OXIDE IN SAID ZONES TO PROVIDE AN AQUEOUS BARRIER BETWEEN ZONES IN WHICH OXIDE AND ZONES IN WHICH GLYCOL ARE IN SUBSTANTIAL CONCENTRATION, CONDENSING THE OVERHEAD OXIDE AND WATER VAPOURS, RECYCLING SUBSTANTIALLY YTHE ENTIRE CONDENSATE TO THE DISTILLATION-REACTION ZONES, WITHDRAWING AS DISTILLATE BOTTOMS PRODUCT AN AQUEOUS SOLUTION OF MONO-ALKYLENE GLYCOL FROM THE SAID ZONES.
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |