US4551237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arsenic removal from shale oils
Assignee: Union Oil Company of California
•
Filing: 1982-06-25
•
Granted: 1985-11-05
•
Expires: 2002-06-25
Abstract
Abstract Shale oil produced from arsenic-containing oil shale is treated with an aqueous solution of one or more sulfide materials and separated therefrom, yielding an oil fraction of reduced arsenic content. Preferred sulfide materials include ammonium sulfide and ammonium polysulfide.
Inventors
- 👤 Donald M. Fenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:16
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/06; C10G29/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
A method for removing arsenic from shale oil which comprises contacting the oil with a sulfide material in the presence of water and separately recovering an aqueous fraction and an oil fraction of reduced arsenic content.
Claim 2
Independent Claim
36 words
A method for removing arsenic from shale oil which comprises contacting the oil with a sulfide material in the presence of water and separately recovering an aqueous fraction and an oil fraction of reduced arsenic content.
Claim 3
Dependent Claim
27 words
The method defined in claim 1 wherein said sulfide material is selected from the group consisting of hydrogen sulfide, alkali metal sulfides, ammonium sulfides, and mixtures thereof.
Claim 4
Dependent Claim
16 words
The method defined in claim 1 wherein said sulfide material is present in an aqueous solution.
Claim 5
Dependent Claim
16 words
The method defined in claim 1 wherein said contacting comprises mixing an oil and sulfide material.
Claim 6
Dependent Claim
21 words
The method defined in claim 1 wherein said contacting is conducted at temperatures between about 75° C. and about 375° C.
Claim 7
Dependent Claim
19 words
The method defined in claim 1 wherein said contacting is conducted at superatmospheric pressures up to about 4,000 p.s.i.a.
Claim 8
Independent Claim
60 words
A method for removing arsenic from shale oil which comprises contacting the oil with an aqueous solution of a sulfide material selected from the group consisting of alkali metal sulfides, ammonium sulfides and mixtures thereof, at a temperature between about 75° C. and about 375° C., and separately recovering an aqueous fraction and an oil fraction of reduced arsenic content.
Claim 9
Independent Claim
60 words
A method for removing arsenic from shale oil which comprises contacting the oil with an aqueous solution of a sulfide material selected from the group consisting of alkali metal sulfides, ammonium sulfides and mixtures thereof, at a temperature between about 75° C. and about 375° C., and separately recovering an aqueous fraction and an oil fraction of reduced arsenic content.
Claim 10
Dependent Claim
19 words
The method defined in claim 7 wherein said contacting is conducted at superatmospheric pressures up to about 4,000 p.s.i.a.
Claim 11
Dependent Claim
38 words
The method defined in claim 7 wherein said solution has a concentration between about 1 and about 500 grams per liter and is present in a volume from about 0.01 to about 100 times the volume of oil.
Claim 12
Dependent Claim
22 words
The method defined in claim 7 wherein said contacting is conducted at a temperature between about 250° C. and about 350° C.
Claim 13
Independent Claim
78 words
A method for removing arsenic from shale oil which comprises contacting the oil with an aqueous solution comprising at least about 100 grams per liter of a sulfide material selected from the group consisting of ammonium bisulfide, ammonium sulfide, ammonium polysulfide, and mixtures thereof, at a temperature between about 250° C. and about 350° C. and a superatmospheric pressure up to about 4,000 p.s.i.a., and separately recovering an aqueous fraction and an oil fraction of reduced arsenic content.
Claim 14
Independent Claim
78 words
A method for removing arsenic from shale oil which comprises contacting the oil with an aqueous solution comprising at least about 100 grams per liter of a sulfide material selected from the group consisting of ammonium bisulfide, ammonium sulfide, ammonium polysulfide, and mixtures thereof, at a temperature between about 250° C. and about 350° C. and a superatmospheric pressure up to about 4,000 p.s.i.a., and separately recovering an aqueous fraction and an oil fraction of reduced arsenic content.
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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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |