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US4055482A
Expired / Lapsed
US
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Hydrocracking process with rejuvenated catalyst
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-07-01
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Granted: 1977-10-25
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Expires: 1995-07-01
Abstract
Abstract A process for rejuvenating crystalline aluminosilicayte zeolite-containing catalysts which have become at least partially deactivated through use in a hydrocracking process. Used, deactivated catalysts are treated with ion-containing solutions, particularly those containing hydrogen ions and hydrogen precursors, at a pH of from 3.5 to about 9, such that the alkali metal content of the catalyst is substantially reduced to thereby rejuvenate the catalyst to at least its original fresh activity in a hydrocracking process.
Inventors
- 👤 Harry E. Robson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:15
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/90; C; C10; C10G; C10G47/00; C10G47/02; C10G47/10; C10G47/12; C10G47/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
A hydrocracking process which comprises contacting a hydrocarbon feedstock in the presence of hydrogen at hydrocracking conditions of temperature and pressure with a rejuvenated catalyst comprising a synthetic faujasite zeolite and a hydrogenation component, said rejuvenated catalyst (1) having previously become at least partially deactivated after being used in a hydrocracking process including periodic regeneration by contact with an oxygen-containing gas at a temperature within the range of 700° to 1100° F., and (2) having been rejuvenated to at least substantially its original fresh activity by an aqueous treating process restricted to a pH less than about 7.0, said catalyst being rejuvenated by (a) treating said partially deactivated catalyst with an aqueous solution containing ions selected from the group consisting of hydrogen ions, hydrogen precursor ions and mixtures thereof so that the alkali metal content of the zeolite component is less than the amount of alkali metal originally present in said catalyst prior to said treatment with aqueous solution; (b) washing said catalyst subsequent to said contacting; and (c) calcining said washed catalyst at a temperature within the range of about 50° to 1000° F.
Claim 2
Dependent Claim
185 words
A hydrocracking process which comprises contacting a hydrocarbon feedstock in the presence of hydrogen at hydrocracking conditions of temperature and pressure with a rejuvenated catalyst comprising a synthetic faujasite zeolite and a hydrogenation component, said rejuvenated catalyst (1) having previously become at least partially deactivated after being used in a hydrocracking process including periodic regeneration by contact with an oxygen-containing gas at a temperature within the range of 700° to 1100° F., and (2) having been rejuvenated to at least substantially its original fresh activity by an aqueous treating process restricted to a pH less than about 7.0, said catalyst being rejuvenated by (a) treating said partially deactivated catalyst with an aqueous solution containing ions selected from the group consisting of hydrogen ions, hydrogen precursor ions and mixtures thereof so that the alkali metal content of the zeolite component is less than the amount of alkali metal originally present in said catalyst prior to said treatment with aqueous solution; (b) washing said catalyst subsequent to said contacting; and (c) calcining said washed catalyst at a temperature within the range of about 50° to 1000° F.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said aqueous solution comprises ammonium ions.
Claim 4
Dependent Claim
26 words
The process of claim 2 wherein said contacting of the partially deactivated catalyst is carried out at a pH of from about 4.5 to about 6.5.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said solution comprises a solution of ammonium nitrate.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said metallic hydrogenation component comprises palladium.
Claim 7
Dependent Claim
168 words
A hydrocracking process which comprises contacting a hydrocarbon feedstock in the presence of hydrogen at hydrocracking conditions of temperature and pressure with a rejuvenated catalyst comprising a synthetic faujasite zeolite and a hydrogenation component, said rejuvenated catalyst (1) having previously become at least partially deactivated after being used in a hydrocracking process including periodic regeneration by contact with an oxygen-containing gas at a temperature within the range of 700° to 1100° F., and (2) having been rejuvenated to greater than its original fresh activity by an aqueous treating process restricted to a pH less than about 7.0, said catalyst being rejuvenated by (a) treating said partially deactivated catalyst with an aqueous solution containing ions selected from the group consisting of hydrogen ions, hydrogen precursor ions and mixtures thereof, to reduce the alkali metal content of said catalyst by at least about 30%; (b) washing said catalyst subsequent to said contacting; and (c) calcining said washed catalyst at a temperature within the range of about 50° to 1000° F.
Claim 8
Dependent Claim
168 words
A hydrocracking process which comprises contacting a hydrocarbon feedstock in the presence of hydrogen at hydrocracking conditions of temperature and pressure with a rejuvenated catalyst comprising a synthetic faujasite zeolite and a hydrogenation component, said rejuvenated catalyst (1) having previously become at least partially deactivated after being used in a hydrocracking process including periodic regeneration by contact with an oxygen-containing gas at a temperature within the range of 700° to 1100° F., and (2) having been rejuvenated to greater than its original fresh activity by an aqueous treating process restricted to a pH less than about 7.0, said catalyst being rejuvenated by (a) treating said partially deactivated catalyst with an aqueous solution containing ions selected from the group consisting of hydrogen ions, hydrogen precursor ions and mixtures thereof, to reduce the alkali metal content of said catalyst by at least about 30%; (b) washing said catalyst subsequent to said contacting; and (c) calcining said washed catalyst at a temperature within the range of about 50° to 1000° F.
Claim 9
Dependent Claim
11 words
The process of claim 6 wherein said solution comprises ammonium ions.
Claim 10
Dependent Claim
25 words
The process of claim 7 wherein said contacting of the partially deactivated catalyst is carried out at a pH of about 4.5 to about 6.5.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein said solution comprises a solution of ammonium nitrate.
Claim 12
Dependent Claim
12 words
The process of claim 9 wherein said metallic hydrogenation component comprises palladium.
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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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |