Patent US4802987A successfully refreshed from Google Patents.
US4802987A
Expired / Lapsed
US
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Selective permeation of aromatic hydrocarbons through polyethylene glycol impregnated regenerated cellulose or cellulose acetate membranes
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-02-24
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Granted: 1989-02-07
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Expires: 2004-02-24
Abstract
Abstract Aromatic hydrocarbons present in a hydrocarbon feed stream containing a mixture of aromatic hydrocarbons and non-aromatic saturated organic components are separated from said hydrocarbon feed stream by selective permeation of the aromatic hydrocarbon through a regenerated cellulose or cellulose acetate membrane which has been impregnated with polyethylene glycol. The thus treated membrane possesses high selectivity for aromatic hydrocarbons at a high flux. The amount and type of polyethylene glycol impregnated into the membrane is carefully controlled in order to achieve high aromatic selectivity and high flux.
Inventors
- 👤 Laura E. Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:32
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D61/38; B01D67/00; B01D67/0002; B01D67/002; B01D71/00; B01D71/06; B01D71/08; B01D71/10; B01D71/12; B01D71/14; B01D71/16; C; C07; C07C; C07C7/00; C07C7/144; C10; C10G; C10G31/00; C10G31/11; B01D2323/00; B01D2323/46; B01D2325/00; B01D2325/04; B01D2325/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
86 words
A method for separating a feed stream containing a mixture of aromatic and aliphatic hydrocarbons into aromatic rich and aromatic lean streams by selectively permeating, under pervaporation conditions, the aromatic content through a regenerated cellulose or cellulose acetate membrane which has a dry thickness of from about 10 to 25μ and a molecular weight cut-off in the range of from about 10,000 to 50,000, which membrane is impregnated with from 10 to 25 2r% polyethylene glycol having a molecular weight in the range of about 600-14,000.
Claim 2
Independent Claim
86 words
A method for separating a feed stream containing a mixture of aromatic and aliphatic hydrocarbons into aromatic rich and aromatic lean streams by selectively permeating, under pervaporation conditions, the aromatic content through a regenerated cellulose or cellulose acetate membrane which has a dry thickness of from about 10 to 25μ and a molecular weight cut-off in the range of from about 10,000 to 50,000, which membrane is impregnated with from 10 to 25 2r% polyethylene glycol having a molecular weight in the range of about 600-14,000.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein the polyethylene glycol has a molecular weight of about 600, the hydrophilic membrane is regenerated cellulose and the membrane is impregnated with from 13-25 weight percent of the polyethylene glycol.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |