US4929357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanurate crosslinked polyurethane membranes and their use for the separation of aromatics from non-aromatics
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1989-08-09
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Granted: 1990-05-29
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Expires: 2009-08-09
Abstract
Abstract The present invention is directed to non-porous isocyanurate-crosslinked polyurethane membranes. These membranes are useful for the separation of aromatic hydrocarbons from non-aromatic hydrocarbons. The separation can be performed using any commonly accepted membrane separation technique, e.g. reverse osmosis, dialysis, pervaporation or perstraction but is preferably performed under pervaporation or prestraction conditions.
Inventors
- 👤 Robert C. Schucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:53
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D71/00; B01D71/06; B01D71/54; C; C07; C07C; C07C7/00; C07C7/144; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A method comprising separating aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons by contacting the mixture with one side of a non-porous isocyanurate crosslinked polyurethane membrane under conditions such that the aromatic hydrocarbon selectively permeates through the membrane.
Claim 2
Independent Claim
39 words
A method comprising separating aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons by contacting the mixture with one side of a non-porous isocyanurate crosslinked polyurethane membrane under conditions such that the aromatic hydrocarbon selectively permeates through the membrane.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the permeation is conducted under pervaporation or perstraction conditions.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the permeation is conducted under pervaporation conditions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |