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Removal of metal comtaminants from catalysts using buffered oxalic acid
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-05-14
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Granted: 1985-06-11
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Expires: 2004-05-14
Abstract
Abstract A process for removing metal contaminants from a hydroconversion catalyst, said catalyst containing at least one metal from Groups VIB, VIIB or VIII supported on a refractory inorganic oxide. The process comprises contacting the contaminated catalyst with a buffered oxalic acid solution wherein contaminant is removed without dissolving the support.
Inventors
- 👤 Gary B. McVicker
- 👤 James L. Carter
- 👤 Lawrence L. Murrell
- 👤 John J. Ziemiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:31
CPC Classifications
C; C10; C10G; C10G49/00; C10G49/02; B; B01; B01J; B01J21/00; B01J21/20; B01J23/00; B01J23/90; B01J23/96; B01J29/00; B01J29/90; B01J38/00; B01J38/48; B01J38/60; B01J38/62; C10G11/00; C10G11/02; C10G11/04; C10G11/05; B01J23/38; B01J23/40; B01J23/46; B01J23/468; B01J23/54; B01J23/56; B01J23/64; B01J23/656; B01J23/6567; Y; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/516
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
76 words
A process for removing metal contaminants from a hydroconversion catalyst containing at least one metal from Groups VIB, VIIB or VIII supported on a refractory inorganic oxide which is susceptible to acid attack which process comprises contacting the contaminated catalyst at a temperature from about 0° C. to 100° C. with a buffered oxalic acid solution having a pH from about 3 to about 10, wherein the oxalic acid concentration is from about 0.0001M to 5M.
Claim 2
Dependent Claim
76 words
A process for removing metal contaminants from a hydroconversion catalyst containing at least one metal from Groups VIB, VIIB or VIII supported on a refractory inorganic oxide which is susceptible to acid attack which process comprises contacting the contaminated catalyst at a temperature from about 0° C. to 100° C. with a buffered oxalic acid solution having a pH from about 3 to about 10, wherein the oxalic acid concentration is from about 0.0001M to 5M.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the oxalic acid solution is buffered to a pH of about 3 to about 8.5.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the oxalic acid concentration is from about 0.01M to 2M.
Claim 5
Dependent Claim
39 words
The process of claim 1 wherein the oxalic acid solution is buffered with an ammonium salt selected from the group consisting of ammonium acetate, ammonium citrate, ammonium formate, ammonium lactate, ammonium valerate, ammonium proprionate, ammonium urate, and mixtures thereof.
Claim 6
Dependent Claim
39 words
The process of claim 3 wherein the oxalic acid solution is buffered with an ammonium salt selected from the group consisting of ammonium acetate, ammonium citrate, ammonium formate, ammonium lactate, ammonium valerate, ammonium proprionate, ammonium urate, and mixtures thereof.
Claim 7
Dependent Claim
19 words
The process of claim 5 wherein the temperature of contacting is from about 20° C. to about 80° C.
Claim 8
Dependent Claim
32 words
The process of claim 1 wherein the catalyst contains at least one metal selected from Co, Mo, Re and the Pt group metals and the support is alumina, silica-alumina, or a zeolite.
Claim 9
Dependent Claim
32 words
The process of claim 6 wherein the catalyst contains at least one metal selected from Co, Mo, Re and the Pt group metals and the support is alumina, silica-alumina, or a zeolite.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the catalyst is contacted with the buffered oxalic acid for a time sufficient to extract metal contaminant without dissolving the support.
Claim 11
Dependent Claim
27 words
The process of claim 8 wherein the catalyst is contacted with the buffered oxalic acid for a time sufficient to extract metal contaminant without dissolving the support.
Claim 12
Dependent Claim
22 words
The process of claim 1 wherein the buffered oxalic acid solution is a mixture of oxalic acid in an aqueous/non-aqueous solvent system.
Claim 13
Dependent Claim
22 words
The process of claim 10 wherein the buffered oxalic acid solution is a mixture of oxalic acid in an aqueous/non-aqueous solvent system.
Claim 14
Dependent Claim
31 words
The process of claim 1 wherein the metal contaminant is one or more metals selected from the group consisting of iron, vanadium, nickel, sodium, magnesium, chromium, copper, strontium, lithium, and lead.
Claim 15
Dependent Claim
31 words
The process of claim 12 wherein the metal contaminant is one or more metals selected from the group consisting of iron, vanadium, nickel, sodium, magnesium, chromium, copper, strontium, lithium, and lead.
Claim 16
Dependent Claim
10 words
The process of claim 1 wherein the contaminant is iron.
Claim 17
Dependent Claim
10 words
The process of claim 15 wherein the contaminant is iron.
Claim 18
Dependent Claim
12 words
The process of claim 1 wherein the catalyst is a reforming catalyst.
Claim 19
Dependent Claim
12 words
The process of claim 16 wherein the catalyst is a reforming catalyst.
Claim 20
Dependent Claim
15 words
The process of claim 18 wherein the oxalic acid solution is buffered with ammonium acetate.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |