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US4452769A
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Method of preparing crystalline zeolite
Assignee: Mobil Oil AS
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Filing: 1981-02-17
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Granted: 1984-06-05
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Expires: 2001-02-17
Abstract
Abstract A method of preparing a zeolite ZSM-12 type crystal which comprises crystallizing substantially pure ZSM-12 from a silica and optimally alumina gel mixture in the presence of a methyltriethylammonium cation, and the ZSM-12 product produced thereby.
Inventors
- 👤 Pochen Chu
- 👤 Guenter H. Kuehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:58
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/42; Y; Y10; Y10S; Y10S423/00; Y10S423/33
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A method for preparing a zeolite ZSM- 12 type crystalline material which comprises preparing a reaction mixture containing a source of an alkali metal oxide, an oxide of silicon, an oxide of aluminum, methyltriethylammonium ion, and water and having a composition, in terms of mole ratios of oxides, falling within the following ranges: SiO 2 /Al 2 O 3 =40 or higher to ∞ M 2 O/(MTEA) 2 O=0.2 to 2.0 H 2 O/OH - =50 to 400 OH - /SiO 2 =0.05 to 0.35 wherein M is an alkali or alkaline earth metal and MTEA + is a methyltriethylammonium ion and maintaining said mixture under crystallization conditions until crystals of said zeolite are formed.
Claim 2
Independent Claim
115 words
A method for preparing a zeolite ZSM- 12 type crystalline material which comprises preparing a reaction mixture containing a source of an alkali metal oxide, an oxide of silicon, an oxide of aluminum, methyltriethylammonium ion, and water and having a composition, in terms of mole ratios of oxides, falling within the following ranges: SiO 2 /Al 2 O 3 =40 or higher to ∞ M 2 O/(MTEA) 2 O=0.2 to 2.0 H 2 O/OH - =50 to 400 OH - /SiO 2 =0.05 to 0.35 wherein M is an alkali or alkaline earth metal and MTEA + is a methyltriethylammonium ion and maintaining said mixture under crystallization conditions until crystals of said zeolite are formed.
Claim 3
Dependent Claim
64 words
A method according to claim 1 wherein said mixture has a composition, in terms of mole ratios of oxides, falling within the following ranges: SiO 2 /Al 2 O 3 =80 or higher to ∞ M 2 O/(MTEA) 2 O=0.3 to 1.8 H 2 O/OH - =70 to 350 OH - /SiO 2 =0.10 to 0.30 wherein M and MTEA + are as before.
Claim 4
Dependent Claim
15 words
A method according to claim 1 or claim 2 wherein substantially no alumina is present.
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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |