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US3782076A
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Process for reducing the arsenic content of gaseous hydrocarbon streams by use of supported lead oxide
Assignee: Chevron USA Inc
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Filing: 1972-04-27
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Granted: 1974-01-01
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Expires: 1992-04-27
Abstract
Abstract A process for reducing the arsenic content of a gaseous hydrocarbon stream by contacting the stream with a sorbent comprising an oxide of lead dispersed upon a supporting material.
Inventors
- 👤 D Stahlfeld
- 👤 J Young
- 👤 N Carr
- 👤 F Massoth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:28
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
17 words
A process as recited in claim 1 wherein said supporting material is a high surface area alumina.
Claim 2
Dependent Claim
12 words
A process according to claim 2 wherein said lead oxide is PbO.
Claim 3
Dependent Claim
22 words
A process as recited in claim 2 wherein saId hydrocarbons in said feedstream have from one to five carbon atoms per molecule.
Claim 4
Dependent Claim
16 words
A process as recited in claim 4 wherein said hydrocarbon feedstream includes oelfins and water vapor.
Claim 5
Dependent Claim
22 words
A process as recited in claim 5 wherein said contacting takes place at a temperature in the range of 50*F. to 400*F.
Claim 6
Dependent Claim
41 words
A process for reducing the arsenic content of a gaseous hydrocarbon containing feedstream containing arsenic in amounts in excess of 20 ppb, which process comprises contacting said feedstream with a sorbent dispersed on a supporting material, said sorbent comprising lead oxide.
Claim 7
Dependent Claim
17 words
A process as recited in claim 7 wherein said supporting material is a high surface area alumina.
Claim 8
Dependent Claim
22 words
A process as recited in claim 8 wherein said hydrocarbons in said feedstream have from one to five carbon atoms per molecule.
Claim 9
Dependent Claim
12 words
A process according to claim 9 wherein said lead oxide is PbO.
Claim 10
Dependent Claim
16 words
A process as recited in claim 9 wherein said hydrocarbon feedstream includes olefins and water vapor.
Claim 11
Dependent Claim
22 words
A process as recited in claim 11 wherein said contacting takes place at a temperature in the range of 80* to 250*F.
Claim 12
Dependent Claim
21 words
A process as recited in claim 12 wherein said arsenic content of said feedstream after contacting is less than 10 ppb.
Claim 13
Dependent Claim
21 words
A process as recited in claim 10 wherein said arsenic content of said feedstream after treating is less than 2 ppb.
Claim 14
Dependent Claim
18 words
A process in accordance with claim 7 wherein the gaseous hydrocarbon feedstream is a commercial FCC absorber gas.
Claim 15
Dependent Claim
57 words
A process in accordance with claim 15 wherein the absorber gas has a composition comprising: Component Range Vol. % Carbon Monoxide 0.2-3.4 Hydrogen 9-12 Nitrogen 6-10 Methane 27-33 Ethylene 9-11 Ethane 10-13.0 Propylene 15-18.0 Propane 7-15 Butenes 0-1.0 Isobutane 1-2.0 n-Butane 0-1.0 C5 0-3 C6 0-1 Arsenic 50-750 ppb Hydrogen Sulfide 0-2 ppm Carbonyl Sulfide 0-5 ppm
Claim 16
Dependent Claim
51 words
A process for reducing the arsenic content of a gaseous hydrocarbon containing feedstream containing arsenic in amounts in excess of 20 ppb, which process comprises contacting said feedstream with a sorbent dispersed on a supporting material, having a surface area in excess of 50 m2/g, said sorbent consisting of lead oxide.
Claim 17
Dependent Claim
19 words
A process according to claim 17 wherein said supporting material is alumina having a surface area from 150-350 m2/g.
References Cited (Backward Citations)
US2779715A
Cited
US2781297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |