EP0202797A2
Expired / Lapsed
EP
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A method for the synthesis of zeolites
Assignee: Mobil Oil AS
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Filing: 1986-04-29
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Granted: —
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Expires: 2006-04-29
Abstract
Abstract A method for making a zeolite comprises continuously contacting a solution of a silicate with a precipitating reagent to effect continuous change of concentration of the silicate solution and to form an insoluble silica precipitate having a particle size of 1-500 micron. The silica precipitate is then introduced into a reaction mixture, which is maintained under conditions effective to convert said silica into the required zeolite and which contains up to 40% silica solids loading and 0 to 10 weight percent seeds of the required zeolite
Inventors
- 👤 Thomas Richard Kiliany, Jr.
- 👤 Francis Gerard Dwyer
- 👤 John Paul Mcwilliams
- 👤 Yung-Feng Chu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 17:21
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2884; C01B35/00; C01B35/08; C01B35/10; C01B35/1009; C01B39/00; C01B39/02; C01B39/36; C01B39/38; C01B39/40; Y; Y10; Y10S; Y10S423/00; Y10S423/29
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
107 words
A method for making a zeolite comprising a) providing a solution of a silicate: b) providing a precipitating reagent which is effective to precipitate said silicate as silica from said solution; c) continuously contacting said solution with said precipitating reagent to effect continuous change of concentration of said silicate and to form an insoluble silica precipitat, having a particle size of 1-500 micron; and d) introducing said silica precipitate into a reaction mixture, which is maintained under conditions effective to convert said silica into the required zeolite and which contains up to 40% silica solids loading and 0 to 10 weight percent seed of the required zeolite.
Claim 2
Independent Claim
107 words
A method for making a zeolite comprising a) providing a solution of a silicate: b) providing a precipitating reagent which is effective to precipitate said silicate as silica from said solution; c) continuously contacting said solution with said precipitating reagent to effect continuous change of concentration of said silicate and to form an insoluble silica precipitat, having a particle size of 1-500 micron; and d) introducing said silica precipitate into a reaction mixture, which is maintained under conditions effective to convert said silica into the required zeolite and which contains up to 40% silica solids loading and 0 to 10 weight percent seed of the required zeolite.
Claim 3
Independent Claim
17 words
The method of Cliam 1 wherein a source of alumina is present in said crystallization reaction mixture.
Claim 4
Independent Claim
17 words
The method of Cliam 1 wherein a source of alumina is present in said crystallization reaction mixture.
Claim 5
Dependent Claim
22 words
The process of Claim 1 or Claim 2 wherein said precipitate is at least substantially free of aluminum or a source thereof.
Claim 6
Dependent Claim
12 words
The process of any preceding Claim wherein the zeolite produced is ZSM-5.
Claim 7
Dependent Claim
37 words
The method of Claim 4 wherein no organic directing agent is added to the crystallization reaction mixture and the mixture has the following molar composition: wherein M is an alkali or alkaline earth metal of valence n.
Claim 8
Dependent Claim
23 words
6) The method of claim 4 wherein said conditions employed in (d) include a temperature of 140-200°C for 2 hours to 150 days.
Claim 9
Dependent Claim
25 words
7) The method of Claim 4 wherein up to 10 mole % of an organic directing agent R is present in the crystallization reaction mixture.
Claim 10
Dependent Claim
28 words
8) The method of Claim 7 wherein the crystallization reaction mixture has the following molar composition: wherein M is an alkali or alkaline earth metal of valence n.
Claim 11
Dependent Claim
17 words
9) The method of Claim 7 or Claim 8 wherein the organic directing agent R is n-propylamine.
Claim 12
Dependent Claim
28 words
10) The method of any one of Claims 7 to 9 wherein said conditions employed in (d) include a temperature of 85-200°C for 2 hours to 150 days.
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