US4443553A
Expired / Lapsed
US
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Production of fluid catalytic cracking catalysts
Assignee: HARSHAW/FILTROL PARTNERSHIP A PARTNERSHIP OF
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Filing: 1982-09-20
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Granted: 1984-04-17
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Expires: 2002-09-20
Abstract
Abstract In the process of preparing fluid catalytic cracking catalysts where an aqueous slurry, containing a zeolite, or zeolites, an alumina-containing binder, a clay and a silica source, is subjected to drying to form essentially water-free solid catalyst particles, the viscosity of the aqueous slurry can be significantly reduced by incorporation of a small but effective amount of [Al2(OH)6-yCly]x additive. Due to this decrease in viscosity, the solids content of the slurry can be raised until the original, additive-free viscosity level, is reached, which, in turn, results in increased solids throughput rate in the drying step with corresponding savings of thermal energy and improved catalyst production efficiency.
Inventors
- 👤 Robert L. Chiang
- 👤 Julius Scherzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:19
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
In the process of producing fluid catalytic cracking catalysts by spray drying, an aqueous slurry containing a mixture of a Y-type zeolite, an alumina-containing binder, and a silica source selected from naturally occurring and synthetic silica-containing materials and mixtures thereof, the improvement which comprises incorporating in the slurry a slurry viscosity-reducing additive of the general formula [Al 2 (OH) 6-y Cl y ] x , where x is within the range of 1 and 6, and y is in the range of 1 to 2, the additive being added to the slurry in an amount equivalent to from about 0.5% to about 2.5% by weight, calculated as Al 2 O 3 , based on the solids content of the slurry, spray drying the slurry, and recovering essentially water-free catalyst particles.
Claim 2
Dependent Claim
130 words
In the process of producing fluid catalytic cracking catalysts by spray drying, an aqueous slurry containing a mixture of a Y-type zeolite, an alumina-containing binder, and a silica source selected from naturally occurring and synthetic silica-containing materials and mixtures thereof, the improvement which comprises incorporating in the slurry a slurry viscosity-reducing additive of the general formula [Al 2 (OH) 6-y Cl y ] x , where x is within the range of 1 and 6, and y is in the range of 1 to 2, the additive being added to the slurry in an amount equivalent to from about 0.5% to about 2.5% by weight, calculated as Al 2 O 3 , based on the solids content of the slurry, spray drying the slurry, and recovering essentially water-free catalyst particles.
Claim 3
Dependent Claim
13 words
The process of claim 1, wherein the naturally occurring silica source is clay.
Claim 4
Dependent Claim
13 words
The process of claim 1, wherein the synthetic silica source is ammonium polysilicate.
Claim 5
Dependent Claim
21 words
The process of claim 1, wherein the alumina binder is an alpha alumina monohydrate derived from the hydrolysis of alkoxy aluminates.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein the alumina binder is a pseudoboehmitic alumina.
Claim 7
Dependent Claim
25 words
The process of claim 1, wherein the zeolite is selected from rare earth metal exchanged Y-zeolites, ammonium or hydrogen-exchanged Y-zeolites or from mixtures of these.
Claim 8
Dependent Claim
46 words
The process of claim 1, wherein the quantity of additive incorporated in the slurry is in the range from about 0.5% to about 2% by weight, calculated as Al 2 O 3 , and based on the solids content of the slurry to be spray dried.
References Cited (Backward Citations)
US4176090A
Cited
US4100108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |