US4439313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of arsenic impurity from hydrocarbons
Assignee: Lummus Technology LLC
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Filing: 1981-12-21
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Granted: 1984-03-27
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Expires: 2001-12-21
Abstract
Abstract Arsenic is removed from a hydrocarbon containing arsenic as an impurity; e.g., shale oil, by contact with hydrogen in the presence of a contact material, such as coke, to deposit the arsenic on the contact material. The arsenic deposited on the contact material is subsequently reacted with an iron compound to produce an iron-arsenic compound suitable for disposal.
Inventors
- 👤 Harvey D. Schindler
- 👤 Morgan C. Sze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:46
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/003
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
In a process for removing arsenic from a hydrocarbon containing feed including arsenic as an impurity by depositing arsenic impurity on a solid contact material, the improvement comprising: heating said contact material including deposited arsenic in the presence of an iron compound added to the contact material, said iron compound being a compound which reacts with arsenic to produce an iron-arsenic compound suitable for disposal, said heating being to a temperature of at least 1200° F. and at which the iron compound reacts with the deposited arsenic to produce said iron-arsenic compound.
Claim 2
Dependent Claim
92 words
In a process for removing arsenic from a hydrocarbon containing feed including arsenic as an impurity by depositing arsenic impurity on a solid contact material, the improvement comprising: heating said contact material including deposited arsenic in the presence of an iron compound added to the contact material, said iron compound being a compound which reacts with arsenic to produce an iron-arsenic compound suitable for disposal, said heating being to a temperature of at least 1200° F. and at which the iron compound reacts with the deposited arsenic to produce said iron-arsenic compound.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the feed is a shale oil or shale oil residue.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein heating is to a temperature of from 1200° F. to 2000° F.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein the contact material is coke.
Claim 6
Dependent Claim
74 words
The process of claim 4 wherein the coke has a porosity of less than 0.3 cc per gram, a surface area of less than 5 m 2 /g., and a pore distribution wherein at least 40% of the pores have a size greater than 10,000 Å., at least 60% of the pores have a size greater than 1000 Å. and less than 20% of the pores have a size of less than 100 Å.
Claim 7
Dependent Claim
29 words
The process of claim 3 wherein the iron compound is at least one member selected from the group consisting of ferric hydroxide, ferrous sulfate, ferric nitrate and ferric chloride.
Claim 8
Dependent Claim
22 words
The process of claim 6 wherein the iron-arsenic compound is at least one of ferrous arsenide, ferrous arsenous sulfide and iron arsenate.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the contact material is impregnated with the iron compound prior to contacting the feed for arsenic removal.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein the contact material is impregnated with the iron compound subsequent to contacting the feed for arsenic removal.
Claim 11
Dependent Claim
18 words
The process of claim 4 wherein the coke having deposited arsenic is heated by combustion of the coke.
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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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |