Patent US3972807A successfully refreshed from Google Patents.
US3972807A
Expired / Lapsed
US
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Hydrocarbon deasphalting via solvent extraction
Assignee: Universal Oil Products Co
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Filing: 1975-06-25
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Granted: 1976-08-03
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Expires: 1995-06-25
Abstract
Abstract Maximum removal of asphaltic material, including high molecular weight metallic contaminants, from a hydrocarbonaceous charge stock is achieved through the utilization of a solvent extraction zone provided with direct heating facilities in an upper portion thereof. A portion of the solvent-rich hydrocarbon phase is withdrawn from the extraction zone, increased in temperature and introduced into an asphalt settling zone. The separated solvent/hydrocarbon stream, substantially asphalt-free, is reintroduced into the extraction zone at the higher temperature.
Inventors
- 👤 Kenneth D. Uitti
- 👤 Bennie I. Bunas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:02
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/003; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0403; B01D11/0407
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
A process for deasphalting an asphalt-containing hydrocarbonaceous charge stock, in a solvent extraction zone, which process comprises the steps of: a. countercurrently contacting said charge stock, introduced into said zone through an upper first locus thereof, with a hydrocarbon-selective solvent, introduced into said zone through a lower second locus thereof, at extraction conditions selected to produce a solvent-lean asphaltic stream and a solvent-rich hydrocarbon stream; b. withdrawing said asphaltic stream from said zone through a lower third locus below the second locus thereof, and a solvent-rich deasphalted oil from said zone through an upper fourth locus above the first locus thereof; c. withdrawing at least a portion of said solvent-rich hydrocarbon stream from said zone through a fifth locus above the first locus thereof; d. increasing the temperature of said portion and introducing the heated portion into a separation zone to provide a settled asphaltic phase and a solvent/hydrocarbon phase; e. introducing said asphaltic phase into said zone through a sixth locus above the second locus thereof; and, f. introducing said solvent/hydrocarbon phase into said zone through a seventh locus intermediate the first and fifth loci thereof.
Claim 2
Dependent Claim
187 words
A process for deasphalting an asphalt-containing hydrocarbonaceous charge stock, in a solvent extraction zone, which process comprises the steps of: a. countercurrently contacting said charge stock, introduced into said zone through an upper first locus thereof, with a hydrocarbon-selective solvent, introduced into said zone through a lower second locus thereof, at extraction conditions selected to produce a solvent-lean asphaltic stream and a solvent-rich hydrocarbon stream; b. withdrawing said asphaltic stream from said zone through a lower third locus below the second locus thereof, and a solvent-rich deasphalted oil from said zone through an upper fourth locus above the first locus thereof; c. withdrawing at least a portion of said solvent-rich hydrocarbon stream from said zone through a fifth locus above the first locus thereof; d. increasing the temperature of said portion and introducing the heated portion into a separation zone to provide a settled asphaltic phase and a solvent/hydrocarbon phase; e. introducing said asphaltic phase into said zone through a sixth locus above the second locus thereof; and, f. introducing said solvent/hydrocarbon phase into said zone through a seventh locus intermediate the first and fifth loci thereof.
Claim 3
Dependent Claim
22 words
The process of claim 1 further characterized in that said solvent/hydrocarbon phase is introduced through said seventh locus in a downwardly direction.
Claim 4
Dependent Claim
46 words
The process of claim 1 further characterized in that said extraction conditions include temperatures in the range of about 50°F. to about 600°F., pressures from about 100 to about 1,000 psig. and a solvent/charge stock volumetric ratio in the range of about 2.0:1.0 to about 30.0:1.0.
Claim 5
Dependent Claim
28 words
The process of claim 1 further characterized in that the temperature of the solvent-rich hydrocarbon stream withdrawn through said fifth locus is increased about 25°F. to about 125°F.
Claim 6
Dependent Claim
26 words
The process of claim 1 further characterized in that said solvent comprises a light hydrocarbon containing from about 3 to about 7 carbon atoms per molecule.
Claim 7
Dependent Claim
25 words
The process of claim 1 further characterized in that said solvent comprises a normally liquid naphtha fraction having an end boiling point below about 200°F.
Claim 8
Dependent Claim
19 words
The process of claim 5 further characterized in that said solvent comprises a mixture of normal butane and isopentane.
Claim 9
Dependent Claim
19 words
The process of claim 5 further characterized in that said solvent comprises a mixture of propane and normal butane.
Claim 10
Dependent Claim
13 words
The process of claim 5 further characterized in that said solvent is isopentane.
Claim 11
Dependent Claim
18 words
The process of claim 5 further characterized in that said solvent comprises a mixture of propane and isobutane.
References Cited (Backward Citations)
US2086487A
Cited
US2669538A
Cited
US2729589A
Cited
US2950244A
Cited
US3414506A
Cited
US3364138A
Cited
US3423308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |