Patent US5133867A successfully refreshed from Google Patents.
US5133867A
Expired / Lapsed
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Reverse osmosis process for recovery of C3 -C6 aliphatic hydrocarbon from oil
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1991-06-27
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Granted: 1992-07-28
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Expires: 2011-06-27
Abstract
Abstract Solvents comprising C3, C4, C5 and C6 aliphatic hydrocarbons (i.e. propane, propylene, butane, butylene, pentane, cyclopentane, pentene, hexane, cyclohexane, hexene and their isomers) and mixtures thereof, preferably C3 and C4 hydrocarbons and mixtures thereof are recovered from hydrocarbon oils in the liquid phase by the reverse osmosis permeation of said solvent through a polyimide reverse osmosis membrane at low temperature.
Inventors
- 👤 Lucie Y. LaFreniere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:02
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; C; C10; C10G; C10G31/00; C10G31/11
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A method for recovering solvents selected from the group consisting of C 3 , C 4 , C 5 and C 6 aliphatic hydrocarbons and mixtures thereof from oil, said method comprising contacting the solvent containing oil with one side of a reverse osmosis membrane under reverse osmosis conditions and a temperature between about 20° C. and the cloud point of the oil feed to thereby selectively permeate the solvent through the membrane, and recovering the solvent as permeate for reuse.
Claim 2
Independent Claim
81 words
A method for recovering solvents selected from the group consisting of C 3 , C 4 , C 5 and C 6 aliphatic hydrocarbons and mixtures thereof from oil, said method comprising contacting the solvent containing oil with one side of a reverse osmosis membrane under reverse osmosis conditions and a temperature between about 20° C. and the cloud point of the oil feed to thereby selectively permeate the solvent through the membrane, and recovering the solvent as permeate for reuse.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the solvent is selected from the group consisting of C 3 and C 4 hydrocarbons and mixtures thereof.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the solvent is selected from propane and butane and mixtures thereof.
Claim 5
Dependent Claim
31 words
The method of claim 1, 2 or 3 wherein the reverse osmosis process is conducted at a temperature of between about -10° C. and the cloud point of the oil feed.
Claim 6
Dependent Claim
27 words
The method of claim 1, 2 or 3 wherein the reverse osmosis process is practiced at an apparent pressure differential of between about 50 to 1500 psi.
Claim 7
Dependent Claim
15 words
The method of claim 1, 2 or 3 wherein the reverse osmosis membrane is polyimide.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein the polyimide reverse osmosis membrane has a pore size in the range 0.0001 to 0.00 μm.
Claim 9
Dependent Claim
14 words
The method of claim 4 wherein the polyimide reverse osmosis membrane is asymmetric polyimide.
Claim 10
Dependent Claim
25 words
The method of claim 4 wherein the reverse osmosis membrane is asymmetric polyimide and has a pore size in the range 0.0001 to 0.001 μm.
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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) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |