US5063187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst based on crystalline aluminosilicate
Assignee: Sued Chemie AG
•
Filing: 1989-11-14
•
Granted: 1991-11-05
•
Expires: 2009-11-14
Abstract
Abstract A catalyst based on crystalline aluminosilicates of the pentasil type, having an Si/Al atomic ratio of at least 10, has the structure of primary crystallites of a mean diameter of at least 0.1 micron and at most 0.9 micron, which crystallites are partially combined into agglomerates the primary crystallites and/or agglomerates being mutually joined by finely disperse alumina obtainable by hydrolysis of aluminum-organic compounds, the BET surface area of the catalyst being 300 to 600 m2/g and its pore volume (determined by mercury porosimetry) being 0.3 to 0.8 cm3/g.
Inventors
- 👤 Gotz Burgfels
- 👤 Karl Kochloefl
- 👤 Jurgen Ladebeck
- 👤 Friedrich Schmidt
- 👤 Michael Schneider
- 👤 Hans J. Wernicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:52
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J35/00; B01J35/70; B01J35/77; C; C07; C07C; C07C1/00; C07C1/20; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P30/00; Y02P30/20
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
150 words
A catalyst based on crystalline aluminosilicates of the pentasil type, having an Si/Al atomic ratio of at least 10, said catalyst having a structure of primary crystallites of a mean diameter of about 0.1 micron to about 0.9 micron, wherein at least 20 percent of said crystallites are combined into agglomerates of about 5 to about 500 microns in size, the primary crystallites and agglomerates being mutually joined by finely divided alumina obtainable by hydrolysis of aluminum-organic compounds, wherein at least 95 percent (relative to the mean diameter) of the alumina particles being ≦55 microns in size, wherein the BET surface area of the catalyst is about 300 to about 600 m 2 /g, wherein the pore volume (determined by mercury porosity) is about 0.3 to about 0.8 cm 3 /g and wherein at least 60 percent of the pores have a diameter of about 14 to about 80 nm.
Claim 2
Dependent Claim
150 words
A catalyst based on crystalline aluminosilicates of the pentasil type, having an Si/Al atomic ratio of at least 10, said catalyst having a structure of primary crystallites of a mean diameter of about 0.1 micron to about 0.9 micron, wherein at least 20 percent of said crystallites are combined into agglomerates of about 5 to about 500 microns in size, the primary crystallites and agglomerates being mutually joined by finely divided alumina obtainable by hydrolysis of aluminum-organic compounds, wherein at least 95 percent (relative to the mean diameter) of the alumina particles being ≦55 microns in size, wherein the BET surface area of the catalyst is about 300 to about 600 m 2 /g, wherein the pore volume (determined by mercury porosity) is about 0.3 to about 0.8 cm 3 /g and wherein at least 60 percent of the pores have a diameter of about 14 to about 80 nm.
Claim 3
Dependent Claim
20 words
The catalyst of claim 1, wherein the mean diameter of the primary crystallites is about 0.1 to about 0.6 micron.
Claim 4
Dependent Claim
34 words
The catalyst of claim 1 wherein the finely divided alumina binder is present in the amount of about 10 to about 40 percent by weight relative to the weight of the end product catalyst.
Claim 5
Dependent Claim
19 words
The catalyst of claim 1 wherein the finely divided alumina binder is in the form of peptizable hydrated alumina.
Claim 6
Dependent Claim
21 words
The catalyst of claim 1 wherein the finely divided alumina binder is obtained by hydrolysis of aluminum trialkyls or aluminum alkoxides.
Claim 7
Dependent Claim
169 words
In a process for preparing the catalyst of claim 1 by the elevated temperature reaction in an aqueous medium of colloidal silica or alkali metal silicate, aluminum hydroxide or alkali metal aluminate, a source of alkali and a template to form an alkaline aluminosilicate gel with subsequent conversion to a crystalline aluminosilicate, the improvement which comprises: a) stopping the reaction when the primary crystallites have a mean diameter of about 0.1 to about 0.9 micron; b) separating the primary crystallites as pre-agglomerates from the aqueous reaction medium; c) drying the crystallites and subjecting them to an intermediate calcination; d) reacting the product of step (c) in an aqueous medium a substance containing protons or donating protons on heating; e) separating and drying the crystallites and subjecting them to intermediate calcination; f) separating out the agglomerates having a particle size of about 5 to about 500 microns; g) mixing the separated agglomerates of step (f) with finely divided alumina; and h) subjecting the product of step (g) to final calcination.
Claim 8
Dependent Claim
24 words
The process of claim 6 wherein the substance containing protons is an acid, and the substance donating protons or heating is an ammonium salt.
Claim 9
Dependent Claim
60 words
The process of claim 6 wherein the colloidal silica or alkali metal silicate, aluminum hydroxide or alkali metal aluminate, the source of alkali, the template and the water from the mother liquor of previous synthesis are used for producing the aluminosilicate gel and made up by the quantities required by the synthesis of the aluminosilicate gel of the said compounds.
Claim 10
Dependent Claim
16 words
The process of claim 6 wherein the template is tetrapropyl ammonium hydroxide or tetrapropyl ammonium bromide.
Claim 11
Dependent Claim
20 words
The process of claim 6 wherein the template is a mixture of ammonia or an organic amine in an alcohol.
Claim 12
Dependent Claim
10 words
The process of claim 10 wherein the alcohol is butanol.
Claim 13
Dependent Claim
40 words
The process of claim 6 wherein the aqueous medium (first occurrence) has a pH of about 10 to about 13, and the formation of the primary aluminosilicate crystallites takes place with stirring at about 90° C. to about 190° C.
Claim 14
Dependent Claim
16 words
The process of claim 12 wherein the temperature is about 90° C. to about 150° C.
Claim 15
Dependent Claim
17 words
The process of claim 12 wherein the stirring is conducted at a maximum speed of 900 rpm.
Claim 16
Dependent Claim
20 words
The process of claim 6 wherein the primary crystallites are separated in step (b) with the addition of a flocculant.
Claim 17
Dependent Claim
14 words
The process of claim 15 wherein the flocculant is a cationic organic macromolecular compound.
Claim 18
Dependent Claim
19 words
The process of claim 16 wherein the flocculant is a copolymer of acrylamide and a cationic acrylic acid derivative.
Claim 19
Dependent Claim
39 words
The process of claim 6 wherein the intermediate calcination step (c) is conducted in an inert atmosphere at about 200° C. to about 350° C. and then in an oxidizing atmosphere at about 500° C. to about 600° C.
Claim 20
Dependent Claim
38 words
The process of claim 6 wherein the intermediate calcination of step (e) and the final calcination of step (h) is conducted at temperature of about 400° C. to about 800° C. for about 5 to about 20 hours.
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) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |