EP0225785A2
Expired / Lapsed
EP
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Preparation of mono-disperse metal oxides
Assignee: Akzo NV
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Filing: 1986-12-04
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Granted: —
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Expires: 2006-12-04
Abstract
Abstract A process for the preparation of a mono-disperse metal oxide material characterised in that it comprises hydrolysing an alkoxide in the presence of a solvent at a temperature and pH necessary to produce a sol and super-critically treating the sol with an extraction fluid and adequate agitation to produce a mono-disperse metal oxide is disclosed. The present invention provides advantages over the prior art.
Inventors
- 👤 Paul Albert Iacobucci
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 23:02
CPC Classifications
B; B01; B01J; B01J2/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/157; C01B33/158; C01B33/1585; B01J13/00; B01J13/0091; C01B13/00; C01B13/14; C01B13/32; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/30; C01P2004/32; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/12; C01P2006/14; C01P2006/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
A process for the preparation of a mono-disperse metal oxide material characterised in that it comprises hydrolysing an alkoxide in the presence of a solvent at a temperature and pH necessary to produce a sol and super-critically treating the sol with an extraction fluid and adequate agitation to produce a mono-disperse metal oxide.
Claim 2
Dependent Claim
53 words
A process for the preparation of a mono-disperse metal oxide material characterised in that it comprises hydrolysing an alkoxide in the presence of a solvent at a temperature and pH necessary to produce a sol and super-critically treating the sol with an extraction fluid and adequate agitation to produce a mono-disperse metal oxide.
Claim 3
Dependent Claim
38 words
A process as claimed in claim 1 wherein the mono-disperse metal oxide comprises at least one metal oxide corresponding to metals of Groups IIA&B, IIIA&B, IVA&B, VA&B, VIA&B, VIIB and Group VIII of the Periodic Table of Elements.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 2 wherein the metal oxide comprises two or more metals of the listed group.
Claim 5
Dependent Claim
19 words
A process as claimed in any of claims 1 to 3 wherein the metal oxide is silica or titania.
Claim 6
Dependent Claim
23 words
A process as claimed in any of claims 1 to 4 wherein a catalyst is used which is an acid or a base.
Claim 7
Dependent Claim
18 words
A process as claimed in any of claims 1 to 5 wherein the solvent utilized is an alcohol.
Claim 8
Dependent Claim
19 words
A process as claimed in any of claims 1 to 5 wherein the solvent utilized is an alcohol-aromatic mixture.
Claim 9
Dependent Claim
14 words
A process as claimed in claim 7 wherein the solvent is a toluene-butanol mixture.
Claim 10
Dependent Claim
29 words
A process as claimed in any of claims 1 to 8 wherein the temperature during preparation of the sol ranges from -20°C to the boiling point of the solvent.
Claim 11
Dependent Claim
15 words
A process as claimed in claim 9 wherein the temperature ranges from 20 to 30°C.
References Cited (Backward Citations)
No citation records indexed.
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