US4589978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for reduction of SOx emissions from FCC units
Assignee: Mobil Oil AS
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Filing: 1985-03-01
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Granted: 1986-05-20
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Expires: 2005-03-01
Abstract
Abstract SO x emission control from a catalytic cracking regenerator unit is improved by using a SO x transfer catalyst which has improved SO x adsorption capacity and which consists essentially of cerium or cerium and lanthanum or comprises cerium and/or lanthanum and alumina wherein cerium comprises at least about 1 wt. %.
Inventors
- 👤 Gary J. Green
- 👤 Tsoung Y. Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:17
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; B; B01; B01J; B01J23/00; B01J23/10; B01J37/00; B01J37/04; C10G11/05; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
113 words
In a process for reducing SO x emissions from flue gas in a hydrocarbon catalytic cracking system wherein a cracking catalyst and an SO x transfer catalyst are circulated between catalyst regeneration zone where sulfur oxides contained in said regeneration zone are reacted with said SO x transfer catalyst and a hydrocarbon cracking zone where hydrogen sulfide is formed by contacting said reacted SO x transfer catalyst with a hydrocarbon stream, the improvement comprising operating said regenerator at a temperature of at least 700° C. and using as said SO x transfer catalyst alumina and at least 1 wt. % of a rare earth mixture of cerium and lanthanum relative to said alumina.
Claim 2
Dependent Claim
113 words
In a process for reducing SO x emissions from flue gas in a hydrocarbon catalytic cracking system wherein a cracking catalyst and an SO x transfer catalyst are circulated between catalyst regeneration zone where sulfur oxides contained in said regeneration zone are reacted with said SO x transfer catalyst and a hydrocarbon cracking zone where hydrogen sulfide is formed by contacting said reacted SO x transfer catalyst with a hydrocarbon stream, the improvement comprising operating said regenerator at a temperature of at least 700° C. and using as said SO x transfer catalyst alumina and at least 1 wt. % of a rare earth mixture of cerium and lanthanum relative to said alumina.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the weight ratio of cerium to alumina is at least 0.1.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the weight ratio of cerium to lanthanum is 1:10 to 10:1.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein the weight ratio or cerium to lanthanum is 1:2 to 2:1.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein said alumina is selected from the group consisting of gamma, eta, theta synthetic alumina and natural alumina.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein said alumina is free of transition metals.
Claim 8
Dependent Claim
28 words
The process of claim 1 wherein said rare earth mixture is contained on said alumina, and further including a matrix to support said rare earth mixture and alumina.
Claim 9
Dependent Claim
22 words
The process of claim 7 wherein said support is selected from the group consisting of silica, silica-alumina, zeolites, kieselguhr, celite, and alumina.
Claim 10
Dependent Claim
10 words
The process of claim 8 wherein said support is silica.
Claim 11
Dependent Claim
21 words
The process of claim 1 wherein said SO x transfer catalyst is combined with a cracking catalyst as a single particle.
Claim 12
Dependent Claim
22 words
The process of claim 1 wherein said SO x transfer catalyst is circulated as a separate particle distinct from the cracking catalyst.
Claim 13
Dependent Claim
30 words
The process of claim 1 wherein said regenerator is operated at less than a 3 vol. % excess of O 2 required to completely oxidize CO to CO 2 .
Claim 14
Dependent Claim
15 words
The process of claim 12 wherein said excess of O 2 is 0-2 vol. %.
Claim 15
Dependent Claim
17 words
The process of claim 12 wherein the weight ratio of cerium to lanthanum is 1:10 to 10:1.
Claim 16
Dependent Claim
106 words
In a process for reducing SO x emissions from flue gas in a hydrocarbon catalytic cracking system wherein a cracking catalyst and an SO x transfer catalyst are circulated between a catalyst regeneration zone where sulfur oxides contained in said regeneration zone are reacted with said SO x transfer catalyst and a hydrocarbon cracking zone where hydrogen sulfide is formed by contacting said reacted SO x transfer catalyst with a hydrocarbon stream, the improvement comprising wherein said SO x transfer catalyst consists essentially of cerium or a combination of cerium and lanthanum supported on a silica matrix which is inert to reaction with SO x .
Claim 17
Dependent Claim
106 words
In a process for reducing SO x emissions from flue gas in a hydrocarbon catalytic cracking system wherein a cracking catalyst and an SO x transfer catalyst are circulated between a catalyst regeneration zone where sulfur oxides contained in said regeneration zone are reacted with said SO x transfer catalyst and a hydrocarbon cracking zone where hydrogen sulfide is formed by contacting said reacted SO x transfer catalyst with a hydrocarbon stream, the improvement comprising wherein said SO x transfer catalyst consists essentially of cerium or a combination of cerium and lanthanum supported on a silica matrix which is inert to reaction with SO x .
Claim 18
Dependent Claim
13 words
The process of claim 15 wherein said SO x transfer catalyst includes lathanum.
Claim 19
Dependent Claim
17 words
The process of claim 16 wherein the weight ratio of cerium to lanthanum is 1:10 to 10:1.
Claim 20
Dependent Claim
17 words
The process of claim 17 wherein the weight ratio of cerium to lanthanum is 1:2 to 2:1.
Claim 21
Dependent Claim
18 words
The process of claim 16 wherein the regenerator is operated at a temperature of at least 700° C.
Claim 22
Dependent Claim
17 words
The process of claim 19 wherein the weight ratio of cerium to lanthanum is 1:10 to 2:1.
Claim 23
Dependent Claim
22 words
The process of claim 15 wherein said SO x transfer catalyst is circulated as a separate particle distinct from the cracking catalyst.
Claim 24
Dependent Claim
29 words
The process of claim 15 wherein said rengenerator is operated at less than a 3 vol. % excess of O 2 required completely oxidize CO to CO 2 .
Claim 25
Dependent Claim
15 words
The process of claim 22 wherein said excess of 0 2 is 0-2 vol. %.
Claim 26
Dependent Claim
14 words
The process of claim 22 wherein said SO x transfer catalyst further includes lanthanum.
Claim 27
Dependent Claim
17 words
The process of claim 24 wherein the weight ratio of cerium to lanthanum is 1:10 to 10:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |