EP0306238A2
Expired / Lapsed
EP
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ZSM-5 and its synthesis
Assignee: Mobil Oil AS
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Filing: 1988-08-26
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Granted: —
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Expires: 2008-08-26
Abstract
Abstract Preparation of porous crystalline silicates having the structure of ZSM-5 and a mesitylene sorption capacity of at least 3.0 weight percent from a non-organic reaction mixture having at least about 35 weight percent solids content and a OH⁻/SiO₂ molar ratio of at least about 0.11.
Inventors
- 👤 Donald Joseph Klocke
- 👤 Sowmithri Krishnomurthy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 01:21
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/36; C01B39/38; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
45 words
ZSM-5 in the form of a crystal having two dimensions of at least about 0.05 micron and a third dimension of less than about 0.02 micron, wherein the pore structure of the ZSM-5 comprises tortuous channels running substantially in the direction of said third dimension.
Claim 2
Dependent Claim
45 words
ZSM-5 in the form of a crystal having two dimensions of at least about 0.05 micron and a third dimension of less than about 0.02 micron, wherein the pore structure of the ZSM-5 comprises tortuous channels running substantially in the direction of said third dimension.
Claim 3
Dependent Claim
82 words
A process for preparing ZSM-5 as claimed in claim 1 comprising the steps of: a) providing an aqueous crystallization reaction mixture which is free of organic directing agents and which includes sources of silica, alumina and hydroxyl ions such that the solids content of the reaction mixture is at least 35 weight percent and the OH⁻/SiO₂ molar ratio is at least 0.11; b) effecting crystallization of said reaction mixture while continuously agitating the mixture; and c) recovering ZSM-5 crystals from the mixture.
Claim 4
Dependent Claim
26 words
The process of claim 2 wherein at least about 1% seeds based on total solids of the crystallization reaction mixture are present in said reaction mixture.
Claim 5
Dependent Claim
26 words
The process of claim 2 or claim 3 wherein the silica source is a silica precipitate formed by addition of acid to an aqueous silicate solution.
Claim 6
Dependent Claim
20 words
The process of any one of claims 2 to 4 wherein said solids content is at least 37 weight percent.
Claim 7
Dependent Claim
20 words
The process of any one of claims 2 to 5 wherein said OH⁻/SiO₂ molar ratio is greater than about 0.11.
Claim 8
Dependent Claim
19 words
The process of any one of claims 2 to 6 wherein the OH⁻/SiO₂ molar ratio is 0.12 - 0.20.
Claim 9
Dependent Claim
23 words
The process of any one of claims 2 to 7 wherein said reaction mixture has a SiO₂/Al₂O₃ molar ratio of 25 - 50.
Claim 10
Dependent Claim
14 words
The process of claim 8 wherein said SiO₂/Al₂O₃ molar ratio is 30 - 40.
References Cited (Backward Citations)
No citation records indexed.
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