US4594332A
Expired / Lapsed
US
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Preparation of hard, fracture-resistant catalysts from zeolite powder
Assignee: BASF SE
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Filing: 1985-08-02
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Granted: 1986-06-10
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Expires: 2005-08-02
Abstract
Abstract Hard, fracture-resistant catalysts are prepared from zeolites of the pentasil family by a process in which water, organic additives which increase the viscosity and a silicate are added to the zeolite powder, and the material is molded, dried and calcined. The fracture-resistant zeolites obtained are used as catalyst carriers.
Inventors
- 👤 Wolfgang Hoelderich
- 👤 Lothar Riekert
- 👤 Michael Kotter
- 👤 Ulrich Hammon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:51
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01J29/00; B01J29/04; B01J29/06; B01J29/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A process for the preparation of a hard, fracture-resistant zeolite catalyst of the pentasil family, wherein water, hydroxyethylcellulose and a silicate are added to the zeolite powder, and the material is molded, dried and calcined.
Claim 2
Dependent Claim
35 words
A process for the preparation of a hard, fracture-resistant zeolite catalyst of the pentasil family, wherein water, hydroxyethylcellulose and a silicate are added to the zeolite powder, and the material is molded, dried and calcined.
Claim 3
Dependent Claim
27 words
A process for the preparation of a zeolite catalyst as claimed in claim 1, wherein molding is carried out by spraying the material in a spray tower.
Claim 4
Dependent Claim
27 words
A process for the preparation of a zeolite catalyst as claimed in claim 1, wherein molding is carried out by kneading the material and then extruding it.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 3, wherein the extrudates are dried and then impregnated with a solution of 2.5% of tetramethyl orthosilicate in carbon tetrachloride.
Claim 6
Dependent Claim
12 words
The hard, fracture-resistant zeolite catalyst prepared by the process of claim 1.
Claim 7
Dependent Claim
12 words
The hard, fracture-resistant zeolite catalyst prepared by the process of claim 4.
References Cited (Backward Citations)
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |