EP0093519A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of preparing high silica zeolites with control of zeolite morphology
Assignee: Mobil Oil AS
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Filing: 1983-04-13
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Granted: —
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Expires: 2003-04-13
Abstract
Abstract Process for crystallizing high silica zeolites, by control of the pH so as to obtain zeolitic compositions of a varying morphology depending on the final pH of the reaction medium.
Inventors
- 👤 Guenter Hinrich Kuehl
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 08:40
CPC Classifications
C; C01; C01B; C01B37/00; C01B37/02; B; B01; B01J; B01J29/00; B01J29/03; B01J29/035
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A process for producing high silica zeolites with control of the morphology of the zeolites so produced, which process comprises A) forming a reaction mixture containing a source of alkali metal oxide, a source of silica, a quaternary ammonium ion, water and a buffer capable of controlling the final pH of the reaction mixture to a value within the range of 9.5 to 12; and B) holding said reaction mixture at elevated temperature and pressure until zeolite crystals are formed.
Claim 2
Dependent Claim
80 words
A process for producing high silica zeolites with control of the morphology of the zeolites so produced, which process comprises A) forming a reaction mixture containing a source of alkali metal oxide, a source of silica, a quaternary ammonium ion, water and a buffer capable of controlling the final pH of the reaction mixture to a value within the range of 9.5 to 12; and B) holding said reaction mixture at elevated temperature and pressure until zeolite crystals are formed.
Claim 3
Dependent Claim
15 words
The process of Claim 1 wherein the high silica zeolite is a ZSM-5 type zeolite.
Claim 4
Dependent Claim
26 words
The process of Claim 1 or Claim 2 wherein the final pH is controlled within a range of 12-12.5 so as to obtain near spherulitic morphology.
Claim 5
Dependent Claim
27 words
The process of Claim 1 or Claim 2 wherein the final pH is controlled within a range of 10-10.5 in order to obtain rod-shaped ZSM-5 type crystals.
Claim 6
Dependent Claim
27 words
The process of any of Claims 1 to 4 wherein the buffer is selected from the group consisting of phosphate, tartrate, citrate, oxalate, ethylenediaminetetraacetate, acetate and carbonate.
Claim 7
Dependent Claim
14 words
The process of any of Claims 2 to 5 wherein the zeolite is ZSM-5.
Claim 8
Dependent Claim
14 words
The process of any of Claims 2 to 5 wherein the zeolite is ZSM-12.
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