US4188280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing arsenic from shale oil
Assignee: Chevron USA Inc
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Filing: 1978-09-25
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Granted: 1980-02-12
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Expires: 1998-09-25
Abstract
Abstract A combination process for reducing the soluble arsenic content of shale oil comprising thermally dearsenating the shale oil to make an aged shale oil, coking at least a portion of the aged shale oil, and catalytically hydroprocessing at least a portion of the coker distillate to produce a shale oil product having a low soluble arsenic content.
Inventors
- 👤 Harbo P. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:37
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/06; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
A method for producing a hydroprocessed shale oil product from a shale oil feedstock contaminated with more than 4 ppmw arsenic in the form of at least one soluble arsenic compound, which comprises: (a) forming an aged shale oil having an arsenic content lower than that of said feedstock by contacting said feedstock with a porous solid contact material at a temperature from 149° to 510° C. (300° to 950° F.), at a liquid hourly space velocity from 0.1 to 60 volumes of liquid per hour per volume of contact material, and a pressure sufficient to maintain said feedstock in substantially liquid phase, whereby a portion of said arsenic is deposited upon said contact material; (b) forming a coker distillate having an arsenic content lower than that of said aged shale oil and an arsenic-containing coke by coking at least a portion of said aged shale oil; and (c) forming said shale oil product having less than 1 ppmw soluble arsenic and a higher hydrogen-to-carbon ratio than said feedstock by catalytically reacting at least a portion of said distillate from step (b) at an elevated temperature with hydrogen in the presence of a hydroprocessing catalyst.
Claim 2
Independent Claim
195 words
A method for producing a hydroprocessed shale oil product from a shale oil feedstock contaminated with more than 4 ppmw arsenic in the form of at least one soluble arsenic compound, which comprises: (a) forming an aged shale oil having an arsenic content lower than that of said feedstock by contacting said feedstock with a porous solid contact material at a temperature from 149° to 510° C. (300° to 950° F.), at a liquid hourly space velocity from 0.1 to 60 volumes of liquid per hour per volume of contact material, and a pressure sufficient to maintain said feedstock in substantially liquid phase, whereby a portion of said arsenic is deposited upon said contact material; (b) forming a coker distillate having an arsenic content lower than that of said aged shale oil and an arsenic-containing coke by coking at least a portion of said aged shale oil; and (c) forming said shale oil product having less than 1 ppmw soluble arsenic and a higher hydrogen-to-carbon ratio than said feedstock by catalytically reacting at least a portion of said distillate from step (b) at an elevated temperature with hydrogen in the presence of a hydroprocessing catalyst.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said aged shale oil is formed at a temperature of 149° to 427° C. (300° to 800° F.) and below the point of significant thermal decomposition.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said aged shale oil is formed in the absence of added hydrogen.
Claim 5
Dependent Claim
32 words
The method of claim 1 where said aged shale oil is formed in the presence of hydrogen at a hydrogen partial pressure from 3.4 to 204 atm gauge (50 to 3000 psig).
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said contact material is non-catalytic with respect to arsenic removal.
Claim 7
Dependent Claim
40 words
The method of claim 1 wherein immediately prior to step (b), said aged shale oil is fractionated into a light distillate fraction and a heavy fraction which is said portion of aged shale oil which is coked in step (b).
Claim 8
Dependent Claim
65 words
The method of claim 1 wherein said shale oil feedstock contains at least 10 ppmw iron in the form of at least one soluble iron compound, in step (a), iron is deposited upon said contact material, in step (b) said coker distillate has a lower soluble iron content than said aged shale oil, and said shale oil product has less than 1 ppm soluble iron.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein said aged shale oil has a lower pour point than said shale oil feedstock.
References Cited (Backward Citations)
US2910434A
Cited
US2911353A
Cited
US3132088A
Cited
US3947347A
Cited
US3804750A
Cited
US3933625A
Cited
US4051022A
Cited
USB438916I5
Cited
US3876533A
Cited
US3954603A
Cited
US4003829A
Cited
US4029571A
Cited
US4046674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |