US5045206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective multi-ring aromatics extraction using a porous, non-selective partition membrane barrier
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1990-12-05
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Granted: 1991-09-03
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Expires: 2010-12-05
Abstract
Abstract Multi-ring aromatic hydrocarbons and/or toxins are selectively solvent extracted from hydocarbon feed streams by the process comprising contacting the aromatics and/or toxins containing hydrocarbon stream with one side of a porous, non-selective partition barrier membrane while simultaneously contacting the other side of said membrane with an aromatics selective extraction solvent whereby the multi-ring aromatic hydrocarbons and/or toxins selectively migrate through the porous partition barrier membrane in response to the selective solvent. A preferred extraction solvent is ethylenediamine. The permeate comprising multi-ring aromatics in solvent can be subjected to a membrane separation process to separate the extraction solvent from the aromatics.
Inventors
- 👤 Tan-Jen Chen
- 👤 James R. Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:42
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/246; B01D11/00; B01D11/04; B01D11/0415; C; C07; C07C; C07C7/00; C07C7/144; C10; C10G; C10G31/00; C10G31/11
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A process for separating multi-ring aromatic hydrocarbons having less than 75 mole % aromatic carbon content and/or toxins from hydrocarbon feeds boiling in the 320° to 1100° F. range, said process comprising contacting said hydrocarbon feed with one side of a porous, non-selective membrane, said membrane having a pore size of about 100 to 5000 Å, while simultaneously contacting the other side of said membrane with a selective aromatics extraction solvent, whereby the multi-ring aromatic hydrocarbons and/or toxins in the feed selectively permeate through the porous membrane in response to the extraction solvent.
Claim 2
Dependent Claim
93 words
A process for separating multi-ring aromatic hydrocarbons having less than 75 mole % aromatic carbon content and/or toxins from hydrocarbon feeds boiling in the 320° to 1100° F. range, said process comprising contacting said hydrocarbon feed with one side of a porous, non-selective membrane, said membrane having a pore size of about 100 to 5000 Å, while simultaneously contacting the other side of said membrane with a selective aromatics extraction solvent, whereby the multi-ring aromatic hydrocarbons and/or toxins in the feed selectively permeate through the porous membrane in response to the extraction solvent.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the extraction solvent is selected from phenol, furfural, sulfolane, aliphatic polyamines, N-methyl pyrrolidone (NMP) and mixtures thereof.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the extraction solvent is NMP.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein the extraction solvent is ethylene diamine.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein the multi-ring aromatic and/or toxin permeate in solvent is separated from the solvent by selective permeation of the solvent through a membrane.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |