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US4559313A
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Removal of inorganic contaminants from catalysts
Assignee: Georgia Tech Research Institute
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Filing: 1983-07-25
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Granted: 1985-12-17
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Expires: 2003-07-25
Abstract
Abstract Spent catalysts containing metal impurities are treated by a process comprising treating the spent catalyst with a solution containing oxidizing ferric ion and/or oxidizing bacteria, thereby freeing said spent catalyst of said metal impurities.
Inventors
- 👤 Allan S. Myerson
- 👤 William R. Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:01
CPC Classifications
B; B01; B01J; B01J38/00; B01J38/48; B01J21/00; B01J21/20; B01J23/00; B01J23/90; B01J23/94; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G45/00; C10G45/02; C10G45/04; C10G45/06; C10G45/08; Y; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/516
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
100 words
A method for regenerating spent catalysts selected from the group consisting of porous cobalt-molybdenum catalysts which are used in the hydrotreating of petroleum residues and silica-alumina zeolite cracking catalysts which are used in the cracking of hydrocarbon feedstocks for the removal of nickel and vanadium impurities, comprising: (a) treating said spent catalyst with a 1-10% mixture of hydrogen sulfide in an inert gas at elevated temperature for a time sufficient to sulfide the spent catalyst; and (b) treating the sulfided catalyst with an aqueous ferric ion containing solution without added oxidizing bacteria, thereby leaching impurity metal ions from said catalyst.
Claim 2
Independent Claim
100 words
A method for regenerating spent catalysts selected from the group consisting of porous cobalt-molybdenum catalysts which are used in the hydrotreating of petroleum residues and silica-alumina zeolite cracking catalysts which are used in the cracking of hydrocarbon feedstocks for the removal of nickel and vanadium impurities, comprising: (a) treating said spent catalyst with a 1-10% mixture of hydrogen sulfide in an inert gas at elevated temperature for a time sufficient to sulfide the spent catalyst; and (b) treating the sulfided catalyst with an aqueous ferric ion containing solution without added oxidizing bacteria, thereby leaching impurity metal ions from said catalyst.
Claim 3
Dependent Claim
47 words
The method of claim 1, wherein, prior to said processing, said spent catalyst is prepared for regeneration by draining residual oil from said spent catalyst, washing oil from the catalyst pores by circulation of solvent through the spent catalyst, and removing carbon deposits from said washed catalyst.
Claim 4
Independent Claim
36 words
The method of 2, wherein said spent catalyst is a fixed bed in an HDS unit, and after the leaching step with aqueous ferric ion containing solution, said regenerated catalyst is washed with water and dried.
Claim 5
Independent Claim
36 words
The method of 2, wherein said spent catalyst is a fixed bed in an HDS unit, and after the leaching step with aqueous ferric ion containing solution, said regenerated catalyst is washed with water and dried.
Claim 6
Dependent Claim
36 words
The method of claim 2, wherein said spent catalyst is continuously or batchwise removed from the fixed bed of an HDS unit, and the regenerated catalyst after said leaching treatment is washed with water and dried.
Claim 7
Dependent Claim
32 words
The method of claim 1, wherein said spent catalyst is that which is continuously or semi-continuously removed from a fluid catalytic cracking regenerator and is regenerated in a fixed bed regeneration unit.
Claim 8
Dependent Claim
43 words
The method of claim 1, wherein said catalyst is continuously or semicontinuously removed from a fluid catalytic cracking regenerator and wherein the process of metal removed is conducted either semicontinuously or batchwise, said regenerated catalyst being water washed and dried prior to reuse.
Claim 9
Dependent Claim
42 words
The method of claim 1, wherein said H 2 S containing gas is passed through said catalyst at a rate of 6.24×10 -3 to 6.24×10 -2 m 3 /min/kg for 0.5 to 5 hr at a temperature of 260° to 593° C.
Claim 10
Dependent Claim
42 words
The method of claim 1, wherein said H 2 S containing gas is passed through said catalyst at a rate of 6.24×10 -3 to 6.24×10 -2 m 3 /min/kg for 0.5 to 5 hr at a temperature of 315° to 760° C.
Claim 11
Dependent Claim
32 words
The method of claim 1, wherein the sulfided catalyst is leached with from 0.1 to 2.0 molar ferric ion containing solution for 1-40 minutes at a temperature of 25° to 100° C.
Claim 12
Dependent Claim
22 words
The method of claim 4, wherein in said batchwise treatment, said catalyst is treated as a 20% slurry in a stirred vessel.
Claim 13
Dependent Claim
16 words
The method of claim 1, wherein said source of ferric ion is a simple ferric salt.
Claim 14
Dependent Claim
39 words
The method of claim 1 including the steps of calcining the catalyst in the presence of oxygen to remove coke prior to step (a), and, subsequent to step (b), of washing and drying the catalyst to recover regenerated catalyst.
Claim 15
Dependent Claim
52 words
The method of claim 12 wherein calcining is carried out at a temperature of about 400° C., the temperature and time of step (a) are about 400° C. and about two hours respectively, and the temperature and time of step (b) are about 100° C. and at least about fifteen minutes respectively.
Claim 16
Dependent Claim
28 words
The method of claim 13 wherein the time of step (b) is sufficient to recover catalyst having a BET surface area of at least 187 m 2 /gm.
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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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |