US4532044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arsenic removal method
Assignee: Union Oil Company of California
•
Filing: 1984-03-30
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Granted: 1985-07-30
•
Expires: 2004-03-30
Abstract
Abstract Aqueous and organic fluids which contain arsenic are contacted with spent oil shale from an oil shale retorting operation and separated therefrom, yielding a fluid of reduced arsenic content. In one embodiment, shale oil is placed in contact with spent oil shale under conditions of elevated temperature and pressure to reduce the arsenic content of the oil.
Inventors
- 👤 Donald M. Fenton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:27
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/003; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
27 words
A method for removing arsenic from an aqueous fluid which comprises contacting the fluid with spent oil shale and separating a fluid having a reduced arsenic content.
Claim 2
Independent Claim
27 words
A method for removing arsenic from an aqueous fluid which comprises contacting the fluid with spent oil shale and separating a fluid having a reduced arsenic content.
Claim 3
Dependent Claim
13 words
The method defined in claim 1 wherein the fluid is an aqueous solution.
Claim 4
Dependent Claim
18 words
The method defined in claim 1 wherein contacting is conducted at a temperature up to about 400° C.
Claim 5
Dependent Claim
21 words
The method defined in claim 3 wherein contacting is conducted at a temperature between about 250° C. and about 350° C.
Claim 6
Dependent Claim
29 words
The method defined in claim 3 wherein contacting is conducted under a superatmospheric pressure sufficient to maintain the fluid in a substantially liquid state, up to about 4,000 p.s.i.a.
Claim 7
Dependent Claim
19 words
The method defined in claim 1 wherein the fluid is passed through a bed of spent oil shale particles.
Claim 8
Independent Claim
52 words
A method for removing arsenic from an aqueous solution which comprises contacting the solution with spent oil shale, at a temperature between the freezing point of the solution and about 400° C., and at a pressure between atmospheric pressure and about 4,000 p.s.i.a., and separating a solution having a reduced arsenic content.
Claim 9
Independent Claim
52 words
A method for removing arsenic from an aqueous solution which comprises contacting the solution with spent oil shale, at a temperature between the freezing point of the solution and about 400° C., and at a pressure between atmospheric pressure and about 4,000 p.s.i.a., and separating a solution having a reduced arsenic content.
Claim 10
Independent Claim
53 words
A method for removing arsenic from an aqueous solution, comprising passing the solution through a bed of spent oil shale particles, at temperature between the freezing point of the solution and about 400° C., and at pressures between atmospheric pressure and about 4,000 p.s.i.a., and separating a solution having a reduced arsenic content.
Claim 11
Independent Claim
53 words
A method for removing arsenic from an aqueous solution, comprising passing the solution through a bed of spent oil shale particles, at temperature between the freezing point of the solution and about 400° C., and at pressures between atmospheric pressure and about 4,000 p.s.i.a., and separating a solution having a reduced arsenic content.
References Cited (Backward Citations)
US4201667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |