Patent US4101444A successfully refreshed from Google Patents.
US4101444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst demetallization utilizing a combination of reductive and oxidative washes
Assignee: Coastal Catalyst Technology Inc
•
Filing: 1976-06-14
•
Granted: 1978-07-18
•
Expires: 1996-06-14
Abstract
Abstract A process for the removal of metal poisons such as nickel, iron and/or vanadium from a hydrocarbon conversion catalyst which includes the steps of contacting the catalyst with both a reductive wash and a subsequent oxidative wash to remove at least a portion of the metal poisons from the catalyst. A preferred oxidative wash medium comprises an aqueous solution of hydrogen peroxide. The vanadium and nickel metals may be recovered from the resultant used wash solutions for possible metallurgical use.
Inventors
- 👤 Emmett H. Burk
- 👤 Jin S. Yoo
- 👤 John A. Karch
- 👤 Jui-Yuan Sun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/20; B01J29/00; B01J29/90; Y; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/516
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
99 words
In a process for treating a metal contaminated catalyst which has been poisoned in a hydrocarbon conversion process by a feedstock containing metal poisons to remove at least a portion of the metal contaminants and to produce a catalyst with improved catalytic activity, the improvement which comprises: (i) removing at least a portion of the metal poison from said catalyst by (a) contacting said catalyst with a liquid reductive wash medium; and (b) subsequently contacting the reductively washed catalyst with a liquid oxidative wash medium; and (ii) recovering a catalyst of reduced metal poison content and improved catalytic activity.
Claim 2
Dependent Claim
99 words
In a process for treating a metal contaminated catalyst which has been poisoned in a hydrocarbon conversion process by a feedstock containing metal poisons to remove at least a portion of the metal contaminants and to produce a catalyst with improved catalytic activity, the improvement which comprises: (i) removing at least a portion of the metal poison from said catalyst by (a) contacting said catalyst with a liquid reductive wash medium; and (b) subsequently contacting the reductively washed catalyst with a liquid oxidative wash medium; and (ii) recovering a catalyst of reduced metal poison content and improved catalytic activity.
Claim 3
Dependent Claim
18 words
A process as in claim 1 wherein the oxidative wash medium is an aqueous solution of hydrogen peroxide.
Claim 4
Dependent Claim
27 words
A process as in claim 2 wherein said oxidative wash is effected at a temperature of about 60°-85° C. with a contact time of about 1-5 minutes.
Claim 5
Dependent Claim
20 words
A process as in claim 2 wherein said aqueous hydrogen peroxide comprises about 2 to 30 weight % hydrogen peroxide.
Claim 6
Dependent Claim
20 words
A process as in claim 1 which comprises alternating reductive and oxidative washes, the last wash comprising an oxidative wash.
Claim 7
Dependent Claim
15 words
A process as in claim 1 wherein the contaminated catalyst comprises a zeolitic molecular sieve.
Claim 8
Dependent Claim
50 words
A process as in claim 6 wherein said zeolitic molecular sieve comprises a decationized zeolitic molecular sieve having less than 90% of the aluminum atoms associated with cations, a crystalline structure capable of internally absorbing benzene and a SiO 2 to Al 2 O 3 molar ratio greater than 3.
Claim 9
Dependent Claim
29 words
A process as in claim 5 wherein said reductively washed catalyst is washed to remove at least a portion of the reductive wash medium prior to the oxidative wash.
Claim 10
Dependent Claim
128 words
In a process for treating a metal contaminated catalyst which has been poisoned in a hydrocarbon conversion process by a feedstock containing metal poisons to remove at least a portion of the metal contaminants to produce a catalyst with improved catalytic activity, the improvement which comprises: (i) removing at least a portion of the metal poison from said catalyst by contacting said catalyst with liquid reductive wash medium containing a reducing agent selected from the group consisting of hydrogen, carbon monoxide, hydrogen sulfide, hydrazine, and hydrazine derivatives, borane, diborane, borohydrides, metallic aluminum hydrides, sulfites, thiosulfites, dithionites, hydrothionites, polythionites and mixtures thereof and subsequently contacting said reductively washed catalyst with a liquid oxidative wash medium; and (ii) recovering a catalyst of reduced metal poison content and improved catalytic activity.
Claim 11
Dependent Claim
128 words
In a process for treating a metal contaminated catalyst which has been poisoned in a hydrocarbon conversion process by a feedstock containing metal poisons to remove at least a portion of the metal contaminants to produce a catalyst with improved catalytic activity, the improvement which comprises: (i) removing at least a portion of the metal poison from said catalyst by contacting said catalyst with liquid reductive wash medium containing a reducing agent selected from the group consisting of hydrogen, carbon monoxide, hydrogen sulfide, hydrazine, and hydrazine derivatives, borane, diborane, borohydrides, metallic aluminum hydrides, sulfites, thiosulfites, dithionites, hydrothionites, polythionites and mixtures thereof and subsequently contacting said reductively washed catalyst with a liquid oxidative wash medium; and (ii) recovering a catalyst of reduced metal poison content and improved catalytic activity.
Claim 12
Dependent Claim
18 words
A process as in claim 9 wherein the oxidative wash medium is an aqueous solution of hydrogen peroxide.
Claim 13
Dependent Claim
27 words
A process as in claim 10 wherein said oxidative wash is effected at a temperature of about 60°-85° C. with a contact time of about 1-5 minutes.
Claim 14
Dependent Claim
20 words
A process as in claim 11 wherein said aqueous hydrogen peroxide comprises about 2 to 30 weight % hydrogen peroxide.
Claim 15
Dependent Claim
22 words
A process as in claim 9 which comprises alternating reductive and liquid oxidative washes, the last wash comprising a liquid oxidative wash.
Claim 16
Dependent Claim
15 words
A process as in claim 9 wherein the contaminated catalyst comprises a zeolitic molecular sieve.
Claim 17
Dependent Claim
50 words
A process as in claim 14 wherein said zeolitic molecular sieve comprises a decationized zeolitic molecular sieve having less than 90% of the aluminum atoms associated with cations, a crystalline structure capable of internally absorbing benzene and a SiO 2 to Al 2 O 3 molar ratio greater than 3.
Claim 18
Dependent Claim
29 words
A process as in claim 9 wherein said reductively washed catalyst is washed to remove at least a portion of the reductive wash medium prior to the oxidative wash.
References Cited (Backward Citations)
US3123548A
Cited
US3148155A
Cited
US3122497A
Cited
US3147209A
Cited
US3150103A
Cited
US3168459A
Cited
US3168460A
Cited
US3234145A
Cited
US3147228A
Cited
US3562150A
Cited
US3985639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |