US4954243A
Expired / Lapsed
US
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Catalytic cracking with framework aluminum extracted zeolite
Assignee: Mobil Oil AS
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Filing: 1989-12-22
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Granted: 1990-09-04
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Expires: 2009-12-22
Abstract
Abstract A zeolite, its method of preparation and use is disclosed. The zeolite is characterized by a silica to alumina mole ratio greater than 12 and a Constraint Index of 1 to 12. The zeolite undergoes controlled alumina extraction by treatment with, e.g., strong mineral acid or chelating agent. Removal of aluminum increases the acid activity of the zeolite.
Inventors
- 👤 Guenter H. Kuehl
- 👤 Edward J. Rosinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:15
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; B01J2229/00; B01J2229/10; B01J2229/16; B01J2229/26; B01J2229/30; B01J2229/42
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
A process for catalytically cracking n-hexane in a chargestock containing n-hexane, comprising contacting said chargestock with a zeolite selected from the group consisting of ZSM-5 and ZSM-12 in the acid form, said zeolite having framework aluminum whereby the zeolite framework silica:alumina mole ratio is greater than about 12, wherein said zeolite has been treated to increase its acid activity by a treatment consisting of subjecting the zeolite with a silica:alumina ratio of greater than 12 to an extraction agent selected from the group consisting of sulfuric acid and ethylenediaminetetraacetic acid at a temperature of 50° to 300° C. at a pressure sufficient to maintain a liquid phase to increase the acid activity of said zeolite, wherein at least about 5% of said framework aluminum is extracted; and recovering products of n-hexane cracking.
Claim 2
Dependent Claim
132 words
A process for catalytically cracking n-hexane in a chargestock containing n-hexane, comprising contacting said chargestock with a zeolite selected from the group consisting of ZSM-5 and ZSM-12 in the acid form, said zeolite having framework aluminum whereby the zeolite framework silica:alumina mole ratio is greater than about 12, wherein said zeolite has been treated to increase its acid activity by a treatment consisting of subjecting the zeolite with a silica:alumina ratio of greater than 12 to an extraction agent selected from the group consisting of sulfuric acid and ethylenediaminetetraacetic acid at a temperature of 50° to 300° C. at a pressure sufficient to maintain a liquid phase to increase the acid activity of said zeolite, wherein at least about 5% of said framework aluminum is extracted; and recovering products of n-hexane cracking.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said extraction temperature is 90° to 180° C.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said zeolite, prior to contact with said aluminum extracting reagent, is in the hydrogen or NH 4 form.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said cracking process is fluidized catalytic cracking.
Claim 6
Dependent Claim
159 words
A process for converting a feedstock comprising hydrocarbon compounds to conversion product comprising hydrocarbon compounds of lower molecular weight than feedstock hydrocarbon compounds which comprises contacting said feedstock at conditions sufficient to convert said feedstock to said product with a catalyst composition comprising a zeolite selected from the group consisting of ZSM-5 and ZSM-12 in the acid form, said zeolite having framework aluminum whereby the zeolite framework silica:alumina mole ratio is greater than about 12, wherein said zeolite has been treated to increase its acid activity by a treatment consisting of subjecting the zeolite with a silica:alumina ratio of greater than 12 to an aluminum extraction reagent selected from the group consisting of sulfuric acid and ethylenediaminetetraacetic acid at a temperature of 50° to 300° C. at a pressure sufficient to maintain a liquid phase to increase the acid activity of said zeolite, wherein at least about 5% of said framework aluminum is extracted; and producing said conversion product.
Claim 7
Dependent Claim
159 words
A process for converting a feedstock comprising hydrocarbon compounds to conversion product comprising hydrocarbon compounds of lower molecular weight than feedstock hydrocarbon compounds which comprises contacting said feedstock at conditions sufficient to convert said feedstock to said product with a catalyst composition comprising a zeolite selected from the group consisting of ZSM-5 and ZSM-12 in the acid form, said zeolite having framework aluminum whereby the zeolite framework silica:alumina mole ratio is greater than about 12, wherein said zeolite has been treated to increase its acid activity by a treatment consisting of subjecting the zeolite with a silica:alumina ratio of greater than 12 to an aluminum extraction reagent selected from the group consisting of sulfuric acid and ethylenediaminetetraacetic acid at a temperature of 50° to 300° C. at a pressure sufficient to maintain a liquid phase to increase the acid activity of said zeolite, wherein at least about 5% of said framework aluminum is extracted; and producing said conversion product.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein said temperature is 90° to 180° C.
Claim 9
Dependent Claim
24 words
The process of claim 5 wherein said zeolite, prior to contact with said aluminum extraction reagent, is in the hydrogen or NH 4 form.
Claim 10
Dependent Claim
12 words
The process of claim 5 wherein said conversion process is catalytic cracking.
Claim 11
Dependent Claim
10 words
The process of claim 8, wherein said zeolite is ZSM-5.
Claim 12
Dependent Claim
13 words
The process of claim 5 wherein said conversion process is fluidized catalytic cracking.
Claim 13
Dependent Claim
10 words
The process of claim 5, wherein said zeolite is ZSM-5.
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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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |