US5085762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic cracking of hydrocarbons
Assignee: Mobil Oil AS
•
Filing: 1990-07-05
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Granted: 1992-02-04
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Expires: 2010-07-05
Abstract
Abstract Emission of noxious nitrogen oxides with the flue gas from the regenerator of a fluid catalytic cracking plant are reduced by incorporating into the circulating inventory of cracking catalyst separate additive particles that contain a copper-loaded zeolite material having a characteristic structure with a defined X-ray diffraction pattern. The preferred material of this type is zeolite MCM-22. The copper may be exchanged onto the zeolite or impregnated into the catalyst. In addition, the catalyst may include titanium or zirconium to provide stability and further improvements in stability may be obtained with the addition of rareearth metal cations, especially cerium or yttrium. NOX and CO emissions from the regenerator are reduced, and the gasoline produced in the unit may have an improved octane number.
Inventors
- 👤 Robert P. L. Absil
- 👤 Emmerson Bowes
- 👤 Gary J. Green
- 👤 David O. Marler
- 👤 David S. Shihabi
- 👤 Richard F. Socha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:40
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/7038; B01J29/86; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
142 words
In a catalytic cracking process in which a hydrocarbon feed is cracked in a cracking zone in the absence of added hydrogen and in the presence of a circulating inventory of solid acidic cracking catalyst which acquires a deposit of coke that contains chemically bound nitrogen while the cracking catalyst is in the cracking zone, the coked catalyst being circulated to a regeneration zone to convert the coked catalyst to a regenerated catalyst with the formation of a flue gas comprising nitrogen oxides, the improvement comprising: incorporating into the circulating catalyst inventory an amount of additive particles comprising a synthetic porous crystalline material containing copper metal or cations, the synthetic crystalline material being characterized by an X-ray diffraction pattern including values substantially as set out in Table 1 of the specification, to reduce the content of nitrogen oxides in the flue gas.
Claim 2
Dependent Claim
142 words
In a catalytic cracking process in which a hydrocarbon feed is cracked in a cracking zone in the absence of added hydrogen and in the presence of a circulating inventory of solid acidic cracking catalyst which acquires a deposit of coke that contains chemically bound nitrogen while the cracking catalyst is in the cracking zone, the coked catalyst being circulated to a regeneration zone to convert the coked catalyst to a regenerated catalyst with the formation of a flue gas comprising nitrogen oxides, the improvement comprising: incorporating into the circulating catalyst inventory an amount of additive particles comprising a synthetic porous crystalline material containing copper metal or cations, the synthetic crystalline material being characterized by an X-ray diffraction pattern including values substantially as set out in Table 1 of the specification, to reduce the content of nitrogen oxides in the flue gas.
Claim 3
Dependent Claim
32 words
A process according to claim 1 in which the synthetic porous crystalline material is characterized by an X-ray diffraction pattern including values substantially as set forth in Table 2 of the specification.
Claim 4
Dependent Claim
32 words
A process according to claim 1 in which the synthetic porous crystalline material is characterized by an X-ray diffraction pattern including values substantially as set forth in Table 3 of the specification.
Claim 5
Dependent Claim
32 words
A process according to claim 1 in which the synthetic porous crystalline material is characterized by an X-ray diffraction pattern including values substantially as set forth in Table 4 of the specification.
Claim 6
Dependent Claim
41 words
A process according to claim 1 in which the synthetic porous crystalline material has a composition comprising the molar relationship X.sub.2 O.sub.3 :(n)YO.sub.2, wherein n is at least about 10, X is a trivalent element and Y is a tetravalent element.
Claim 7
Dependent Claim
18 words
A process according to claim 1 in which the synthetic porous crystalline material has the structure of MCM-22.
Claim 8
Dependent Claim
40 words
A process according to claim 1 in which the additive catalyst includes copper metal or cations in an amount equivalent to at least one half mole of CuO for ac mole of Al 2 O 3 in the crystalline material.
Claim 9
Dependent Claim
26 words
A process according to claim 1 in which the amount of additive particles is from 0.1 to 30 weight percent of said circulating inventory including additive.
Claim 10
Dependent Claim
26 words
A process according to claim 8 in which the amount of additive particles is from 0.1 to 10 weight percent of said circulating inventory including additive.
Claim 11
Dependent Claim
25 words
A process according to claim 1 in which the amount of additive particles contain a steam stabilizing amount of an inorganic titanium or zirconium compound.
Claim 12
Dependent Claim
21 words
A process according to claim 1 in which the crystalline material containing copper metal or cations is included in a binder.
Claim 13
Dependent Claim
18 words
A process according to claim 1 in which the additive particles comprise cations of a rare earth metal.
Claim 14
Dependent Claim
16 words
A process according to claim 12 in which the rare earth metal is cerium or yttrium.
Claim 15
Dependent Claim
29 words
A process according to claim 12 in which the amount of rare earth cations in the additive particles is from 0.1 to 10.0 weight percent of the additive particles.
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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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |