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US3981797A
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Control of hydrocarbon deasphalting process
Assignee: Honeywell UOP LLC
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Filing: 1975-07-21
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Granted: 1976-09-21
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Expires: 1995-07-21
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 top-heating facilities in the upper portion thereof. The top-heating section of the extraction zone is divided into two liquid-collecting zones in partial open communication with each other. A portion of the liquid is removed from the lower liquid-collecting zone, increased in temperature and returned to the extractor in the upper liquid-collecting zone. The flow rate of liquid withdrawn from the lower zone is controlled in response to the differential pressure between the two liquid-collecting zones.
Inventors
- 👤 James S. Kellar
- 👤 Don B. Carson
- 👤 David M. Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:22
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/003; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0403; B01D11/0407; C10G21/30; Y; Y10; Y10S; Y10S208/00; Y10S208/01
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
223 words
A process for deasphalting an asphalt-containing hydrocarbonaceous charge stock, in a solvent extraction zone, which comprises the steps of: a. countercurrently contacting said charge stock, introduced into said extraction zone through a 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 extraction zone through a third locus thereof, said third locus being below said second locus, and a solvent-rich deasphalted oil stream from an upper fourth locus thereof; c. withdrawing at least a portion of said solvent-rich hydrocarbon stream through a fifth locus intermediate said first and fourth loci, sid fifth locus being in open communication with a lower liquid-collecting zone within a divided top-heating section of said extraction zone; d. increasing the temperature of said portion of the solvent-rich hydrocarbon stream and introducing the heated portion into said extraction zone through a sixth locus intermediate said fourth and fifth loci, said sixth locus being in open communication with an upper liquid-collecting zone within said divided top-heating section; e. determining the pressure differential between said lower and upper liquid-collecting zones; and, f. adjusting the rate at which said solvent-rich hydrocarbon stream is withdrawn through said fifth locus in response to said differential pressure.
Claim 2
Dependent Claim
223 words
A process for deasphalting an asphalt-containing hydrocarbonaceous charge stock, in a solvent extraction zone, which comprises the steps of: a. countercurrently contacting said charge stock, introduced into said extraction zone through a 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 extraction zone through a third locus thereof, said third locus being below said second locus, and a solvent-rich deasphalted oil stream from an upper fourth locus thereof; c. withdrawing at least a portion of said solvent-rich hydrocarbon stream through a fifth locus intermediate said first and fourth loci, sid fifth locus being in open communication with a lower liquid-collecting zone within a divided top-heating section of said extraction zone; d. increasing the temperature of said portion of the solvent-rich hydrocarbon stream and introducing the heated portion into said extraction zone through a sixth locus intermediate said fourth and fifth loci, said sixth locus being in open communication with an upper liquid-collecting zone within said divided top-heating section; e. determining the pressure differential between said lower and upper liquid-collecting zones; and, f. adjusting the rate at which said solvent-rich hydrocarbon stream is withdrawn through said fifth locus in response to said differential pressure.
Claim 3
Dependent Claim
23 words
The process of claim 1 further characterized in that said first and second liquid-collecting zones are in partial open communication with each other.
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
24 words
The process of claim 1 further characterized in that the heated solvent-rich hydrocarbon stream is introduced through said sixth locus in a downwardly direction.
Claim 7
Dependent Claim
25 words
The process of claim 1 further characterized in that said solvent comprises a light hydrocarbon having from 3 to about 7 carbon atoms per molecule.
Claim 8
Dependent Claim
25 words
The process of claim 1 further characterized in that said solvent is a normally liquid naphtha fraction having an end boiling point below about 200°F.
Claim 9
Dependent Claim
19 words
The process of claim 6 further characterized in that said solvent comprises a mixture of normal butane and isopentane.
Claim 10
Dependent Claim
19 words
The process of claim 6 further characterized in that said solvent comprises a mixture of propane and normal butane.
Claim 11
Dependent Claim
13 words
The process of claim 6 further characterized in that said solvent is isopentane.
Claim 12
Independent Claim
152 words
A method for controlling the heat-input to the top-heating section of a solvent extraction zone in which an asphalt-containing charge stock is countercurrently contacted with a hydrocarbon-selective solvent, at extraction conditions selected to produce a solvent-lean asphaltic stream and a solvent-rich hydrocarbon stream, which method comprises the steps of: a. withdrawing at least a portion of said solvent-rich hydrocarbon stream from a first locus in open communication with a lower liquid-collecting zone within said top-heating section; b. increasing the temperature of the portion of said solvent-rich hydrocarbon stream and introducing the heated portion through a second locus in open communication with an upper liquid-collecting zone within said top-heating section; c. determining the pressure differential between said lower and upper liquid-collecting zones; d. developing a signal representative of said pressure differential; and, e. adjusting the rate at which said solvent-rich hydrocarbon stream is withdrawn through said first locus in response to said signal.
Claim 13
Independent Claim
152 words
A method for controlling the heat-input to the top-heating section of a solvent extraction zone in which an asphalt-containing charge stock is countercurrently contacted with a hydrocarbon-selective solvent, at extraction conditions selected to produce a solvent-lean asphaltic stream and a solvent-rich hydrocarbon stream, which method comprises the steps of: a. withdrawing at least a portion of said solvent-rich hydrocarbon stream from a first locus in open communication with a lower liquid-collecting zone within said top-heating section; b. increasing the temperature of the portion of said solvent-rich hydrocarbon stream and introducing the heated portion through a second locus in open communication with an upper liquid-collecting zone within said top-heating section; c. determining the pressure differential between said lower and upper liquid-collecting zones; d. developing a signal representative of said pressure differential; and, e. adjusting the rate at which said solvent-rich hydrocarbon stream is withdrawn through said first locus in response to said signal.
Claim 14
Dependent Claim
23 words
The method of claim 11 further characterized in that said first and second liquid-collecting zones are in partial open communication with each other.
Claim 15
Dependent Claim
28 words
The method of claim 11 further characterized in that the temperature of the solvent-rich hydrocarbon stream withdrawn through said first locus is increased from 25°F. to about 125°F.
References Cited (Backward Citations)
US3423308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |