US4364847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passivation of metal contaminants on cracking catalyst with a lithium compound
Assignee: Honeywell UOP LLC
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Filing: 1981-05-26
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Granted: 1982-12-21
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Expires: 2001-05-26
Abstract
Abstract A contaminating metal on cracking catalyst used for the cracking of hydrocarbons is passivated by contacting the catalyst with a lithium compound at passivation reaction conditions. The passivation may be effected in a separate passivation zone with an aqueous solution of a water soluble lithium compound or in the cracking zone by dissolving an oil soluble lithium compound in the feedstock. The amount of lithium deposited on the catalyst is from about 0.5 wt. % to about 1.25 wt. % on an elemental basis.
Inventors
- 👤 Hosheng Tu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:50
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; B; B01; B01J; B01J21/00; B01J21/20; B01J23/00; B01J23/02; B01J23/04; B01J29/00; B01J29/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
156 words
A process for passivating a metal on fluidized cracking catalyst which has been contaminated with said metal due to the use of said catalyst in a fluidized cracking system and wherein said catalyst is cycled between a cracking zone, in which said catalyst is contacted at an elevated temperature with a hydrocarbon feedstock containing said metal contaminant which deposits on said catalyst, and a regeneration zone, in which carbon is oxidized and thereby removed from said catalyst, which process comprises contacting at least a portion of said catalyst at passivation reaction conditions with a lithium compound in an amount to deposit on the catalyst about 0.5 wt % to 1.25 wt % lithium on an elemental metal basis, to effect a passivation reaction between said metal and said lithium and the passivation of said metal contaminant so as to increase yield of C 5 + and reduce the yield of hydrogen in said fluidized cracking system.
Claim 2
Dependent Claim
156 words
A process for passivating a metal on fluidized cracking catalyst which has been contaminated with said metal due to the use of said catalyst in a fluidized cracking system and wherein said catalyst is cycled between a cracking zone, in which said catalyst is contacted at an elevated temperature with a hydrocarbon feedstock containing said metal contaminant which deposits on said catalyst, and a regeneration zone, in which carbon is oxidized and thereby removed from said catalyst, which process comprises contacting at least a portion of said catalyst at passivation reaction conditions with a lithium compound in an amount to deposit on the catalyst about 0.5 wt % to 1.25 wt % lithium on an elemental metal basis, to effect a passivation reaction between said metal and said lithium and the passivation of said metal contaminant so as to increase yield of C 5 + and reduce the yield of hydrogen in said fluidized cracking system.
Claim 3
Dependent Claim
12 words
A process in accordance with claim 1 wherein said catalyst comprises alumina.
Claim 4
Dependent Claim
13 words
A process in accordance with claim 1 wherein said catalyst comprises crystalline aluminosilicate.
Claim 5
Dependent Claim
44 words
A process in accordance with claim 1 wherein said contacting of said catalyst with said lithium compound occurs in a passivation zone with said catalyst being cycled from said regeneration zone to said passivation zone and from said passivation zone to said cracking zone.
Claim 6
Dependent Claim
38 words
A process in accordance with claim 4 wherein said lithium compound is water soluble and contained in an aqueous solution, said catalyst being impregnated and thereby passivated with said compound by contact of said solution with said catalyst.
Claim 7
Dependent Claim
34 words
A process in accordance with claim 5 wherein said lithium compound comprises one or more compounds included in the group comprising lithium acetate, lithium nitrate, lithium chloride, lithium benzoate, lithium carbonate or lithium metaborate.
Claim 8
Dependent Claim
23 words
A process in accordance with claim 5 wherein said contact of said portion of said catalyst and said solution is carried out batchwise.
Claim 9
Dependent Claim
28 words
A process in accordance with claim 5 wherein said contact is carried out by continuous percolation of said solution through a bed comprising said portion of said catalyst.
Claim 10
Dependent Claim
45 words
A process in accordance with claim 1 wherein said lithium compound is oil soluble and is added to the feedstock of said cracking system thereby effecting contact of said catalyst with said lithium compound and passivation of said metal contaminants occurs in said cracking zone.
Claim 11
Dependent Claim
29 words
A process in accordance with claim 9 wherein said lithium compound comprises one or more compounds selected from the group consisting of lithium phenylacetylide; lithium 2,4-pentanedionate; and lithium cyclohexanebutyrate.
Claim 12
Dependent Claim
22 words
A process in accordance with claim 1 wherein said metal contaminant is included in the group comprising nickel, vanadium, iron or copper.
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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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |