US4404175A
Expired / Lapsed
US
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Preparation of zeolites
Assignee: BASF SE
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Filing: 1981-05-29
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Granted: 1983-09-13
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Expires: 2001-05-29
Abstract
Abstract A process for the preparation of zeolites of the ZSM-5 structural type from a mixture of SiO 2 and Al(OH) 3 by hydrothermal crystallization in an aqueous amine solution, in the absence of alkali, at from 100° to 200° C., wherein the crystallization is carried out in the presence of a triamine, tetraamine and/or higher amine and the reaction mixture is formulated to have an SiO 2 /Al 2 O 3 molar ratio defined by an equation which involves the chain length and number of amine groups of the amine employed, as well as to have certain molar ratios of H 2 O/amine and amine/Al 2 O 3 , and the use of these zeolites as catalysts for the conversion of alcohols and/or dialkyl ethers to olefins and/or aromatics
Inventors
- 👤 Laszlo Marosi
- 👤 Hans-Ulrich Schlimper
- 👤 Matthias Schwarzmann
- 👤 Joachim Stabenow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:37
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2876; C01B33/2884; C01B35/00; C01B35/08; C01B35/10; C01B35/1009; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y02P30/40; Y10; Y10S; Y10S423/00; Y10S423/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A process for obtaining a crystalline ZSM-5 structural type zeolite of the hydrogen cation form directly which comprises reacting at from 100° to 200° C. in an aqueous solution under autogenous pressure in the absence of both alkali metal ions and quaternary nitrogen bases, and in the presence of a triamine, tetraamine and/or higher amine, an aqueous reaction mixture of SiO 2 and Al(OH) 3 formulated to have a SiO 2 /Al 2 O 3 molar ratio ##EQU2## which depends on the chain length L R and number of amine groups n of the amine employed, and an H 2 O/amine molar ratio of from 0.4 to 100 and an amine/Al 2 O 3 molar ratio of from 5 to 400, and removing the amine from the zeolite pores by combustion.
Claim 2
Dependent Claim
131 words
A process for obtaining a crystalline ZSM-5 structural type zeolite of the hydrogen cation form directly which comprises reacting at from 100° to 200° C. in an aqueous solution under autogenous pressure in the absence of both alkali metal ions and quaternary nitrogen bases, and in the presence of a triamine, tetraamine and/or higher amine, an aqueous reaction mixture of SiO 2 and Al(OH) 3 formulated to have a SiO 2 /Al 2 O 3 molar ratio ##EQU2## which depends on the chain length L R and number of amine groups n of the amine employed, and an H 2 O/amine molar ratio of from 0.4 to 100 and an amine/Al 2 O 3 molar ratio of from 5 to 400, and removing the amine from the zeolite pores by combustion.
Claim 3
Dependent Claim
31 words
The process for obtaining a crystalline zeolite as recited in claim 1, wherein the aqueous solution has a concentration of triamine, tetraamine and/or higher amine of 10 to 70% by weight.
Claim 4
Dependent Claim
22 words
The process for obtaining a crystalline zeolite as recited in claim 1, wherein reaction takes place at from 140° to 170° C.
Claim 5
Dependent Claim
31 words
The process for obtaining a crystalline zeolite as recited in claim 1, wherein the aqueous solution has a concentration of triamine, tetraamine and/or higher amine of 40 to 60% by weight.
Claim 6
Dependent Claim
22 words
The process for obtaining a crystalline zeolite as recited in claim 1, wherein reaction takes place for from 2 to 8 days.
Claim 7
Dependent Claim
22 words
The process for obtaining a crystalline zeolite as recited in claim 3, wherein reaction takes place for from 1 to 4 days.
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |