Patent US4962271A successfully refreshed from Google Patents.
US4962271A
Expired / Lapsed
US
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Selective separation of multi-ring aromatic hydrocarbons from distillates by perstraction
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1989-12-19
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Granted: 1990-10-09
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Expires: 2009-12-19
Abstract
Abstract Membrane separation under perstraction conditions of a lube oil distillate is disclosed which produces a retentate rich in non-aromatics hydrocarbons and alkyl aromatic and a permeate rich in multi-ring aromatics. The recovered retentate is similar to a solvent extracted raffinate but possesses a higher concentration of alkyl-single ring aromatics. The membrane separation process is highly selective for removing multi-ring aromatics from the lube distillate.
Inventors
- 👤 Laura E. Black
- 👤 Robert C. Schucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:23
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/246; C; C10; C10G; C10G31/00; C10G31/11
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A method for separating alkyl substituted and alkyl/hetero-atom substituted multi-ring aromatic hydrocarbons having less than 75 mole % aromatic carbon from distillates containing mixtures of said hydrocarbons with single ring aromatics and non-aromatics by contacting the distillate under perstraction conditions with a selective membrane and permeating the alkyl substituted and alkyl/hetero-atom substituted multi-ring aromatic through said membrane.
Claim 2
Independent Claim
57 words
A method for separating alkyl substituted and alkyl/hetero-atom substituted multi-ring aromatic hydrocarbons having less than 75 mole % aromatic carbon from distillates containing mixtures of said hydrocarbons with single ring aromatics and non-aromatics by contacting the distillate under perstraction conditions with a selective membrane and permeating the alkyl substituted and alkyl/hetero-atom substituted multi-ring aromatic through said membrane.
Claim 3
Dependent Claim
46 words
The method of claim 1 wherein the alkyl substituted multi-ring aromatic is selected from two ring, three ring, and four ring aromatics bearing one or more alkyl side chains containing sufficient nonaromatic carbon so that the aromatic molecule has less than 75 mole % aromatic carbon.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the multi-ring aromatics are fused multi-ring aromatics.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein the membrane is polyurea/urethane.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the membrane is polyurethane imide.
Claim 7
Dependent Claim
10 words
The method of claim 1 wherein the membrane is polyurethane-isocyanurate.
Claim 8
Dependent Claim
16 words
The method of claim 4, 5 or 6 wherein the membrane is supported on a backing.
Claim 9
Dependent Claim
10 words
The method of claim 7 wherein the backing is teflon.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein the feed which is separated is selected from high boiling distillate.
Claim 11
Dependent Claim
17 words
The method of claim 9 wherein the distillate has an initial boiling point above about 350° C.
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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) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |