US4085036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hydrodesulfurization and separate solvent extraction of distillate and deasphalted residual lubricating oil fractions
Assignee: Gulf Research and Development Co
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Filing: 1976-10-01
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Granted: 1978-04-18
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Expires: 1996-10-01
Abstract
Abstract A process for the production of lubricating oils from petroleum stocks containing significant quantities of sulfur and lubricating oil components boiling above about 650 DEG F. (343 DEG C.) by subjecting such stocks to a series of steps comprising hydrodesulfurization, fractionation, and solvent extraction. The residual fraction obtained from the fractionation step may be deasphalted prior to solvent extraction.
Inventors
- 👤 Harry C. Murphy, Jr.
- 👤 Harry C. Stauffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:32
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G67/04; C10G67/0409; C10G67/0418; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
209 words
A process which comprises (a) contacting a crude oil having a crude lubricating oil fraction containing at least 1.5 weight percent sulfur with hydrogen and with a hydrogenation catalyst to obtain a hydrodesulfurized product wherein at least 60 percent by weight of the sulfur contained in said crude lubricating oil fraction has been separated therefrom, (b) fractionating the hydrodesulfurized product of step (a) to obtain a residual lubricating oil fraction 90 percent of which boils above 950° F. and at least one distillate lubricating oil fraction 90 percent of which boils above 650° F. (c) deasphalting said residual lubrication oil fraction, (d) separately extracting said at least one distillate lubricating oil fraction and said deasphalted residual lubricating oil fraction with a solvent selected from the group of phenol, furfural or sulfur dioxide and mixtures thereof to reduce the aromatic content of said at least one distillate fraction and said deasphalted residual lubricating oil fraction, said extracting being performed in a counter current tower, wherein the solvent is introduced into the top section of the tower and the oil fraction from step (c) is introduced at the middle or bottom section of the tower under conventional temperatures and pressures, and (e) separating the solvent from the extracted lubricating oil products.
Claim 2
Dependent Claim
209 words
A process which comprises (a) contacting a crude oil having a crude lubricating oil fraction containing at least 1.5 weight percent sulfur with hydrogen and with a hydrogenation catalyst to obtain a hydrodesulfurized product wherein at least 60 percent by weight of the sulfur contained in said crude lubricating oil fraction has been separated therefrom, (b) fractionating the hydrodesulfurized product of step (a) to obtain a residual lubricating oil fraction 90 percent of which boils above 950° F. and at least one distillate lubricating oil fraction 90 percent of which boils above 650° F. (c) deasphalting said residual lubrication oil fraction, (d) separately extracting said at least one distillate lubricating oil fraction and said deasphalted residual lubricating oil fraction with a solvent selected from the group of phenol, furfural or sulfur dioxide and mixtures thereof to reduce the aromatic content of said at least one distillate fraction and said deasphalted residual lubricating oil fraction, said extracting being performed in a counter current tower, wherein the solvent is introduced into the top section of the tower and the oil fraction from step (c) is introduced at the middle or bottom section of the tower under conventional temperatures and pressures, and (e) separating the solvent from the extracted lubricating oil products.
Claim 3
Dependent Claim
184 words
A process which comprises (a) contacting a crude lubricating oil containing at least 3.5 weight percent sulfur and with hydrogen and with a hydrogenation catalyst under hydrodesulfurization conditions to obtain a hydrodesulfurized product wherein at least 60 weight percent of the sulfur has been separated therefrom, (b) fractionating the hydrodesulfurized product of step (a) to obtain a residual lubricating oil fraction and at least one distillate lubricating oil fraction. (c) deasphalting said residual lubricating oil fraction, (d) separately extracting said at least one distillate lubricating oil fraction and said deasphalted residual lubricating oil fraction with a solvent selected from the group of phenol, furfurol or sulfur dioxide and mixtures thereof to reduce the aromatic content of said at least one distillate fraction and said deasphalted residual lubricating oil fraction, said extracting being performed in a counter current tower, wherein the solvent is introduced into the top section of the tower and the oil fraction from step (c) is introduced at the middle or bottom section of the tower under conventional temperatures and pressures, and (e) separating the solvent from the extracted lubricating oil products.
Claim 4
Dependent Claim
184 words
A process which comprises (a) contacting a crude lubricating oil containing at least 3.5 weight percent sulfur and with hydrogen and with a hydrogenation catalyst under hydrodesulfurization conditions to obtain a hydrodesulfurized product wherein at least 60 weight percent of the sulfur has been separated therefrom, (b) fractionating the hydrodesulfurized product of step (a) to obtain a residual lubricating oil fraction and at least one distillate lubricating oil fraction. (c) deasphalting said residual lubricating oil fraction, (d) separately extracting said at least one distillate lubricating oil fraction and said deasphalted residual lubricating oil fraction with a solvent selected from the group of phenol, furfurol or sulfur dioxide and mixtures thereof to reduce the aromatic content of said at least one distillate fraction and said deasphalted residual lubricating oil fraction, said extracting being performed in a counter current tower, wherein the solvent is introduced into the top section of the tower and the oil fraction from step (c) is introduced at the middle or bottom section of the tower under conventional temperatures and pressures, and (e) separating the solvent from the extracted lubricating oil products.
Claim 5
Dependent Claim
27 words
The process of claim 2 wherein at least 75 weight percent of the sulfur is removed from the crude lubricating oil feed to the hydrodesulfurization step (a).
Claim 6
Dependent Claim
17 words
The process of claim 1 which includes said residual lubricating oil fraction with propane under deasphalting conditions.
Claim 7
Dependent Claim
21 words
The process of claim 2 which includes contacting said residual lubricating oil fraction in step (c) with propane under deasphalting conditions.
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |