US 7,572,423 B2Granted

Fumed metal oxide particles and process for producing the same

AssigneeCabot Corporation

InventorYakov E. Kutsovsky

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Abstract

The invention provides a process for producing fumed metal oxide particles comprising providing a stream of a liquid feedstock comprising a volatizable, non-halogenated metal oxide precursor, providing a stream of a combustion gas having a linear velocity sufficient to atomize and combust or pyrolyze the liquid feedstock, and injecting the stream of the liquid feedstock into the stream of combustion gas to form a reaction mixture such that the liquid feedstock is atomized and subjected to a sufficient temperature and residence time in the combination gas stream for fumed metal oxide particles to form before the combustion gas temperature is reduced below the solidifying temperature of the metal oxide particle. The invention further provides fumed silica particles having a relatively small aggregate size and/or narrow aggregate size distribution.

Claims30

Dependent claims

A process for producing fumed metal oxide particles comprising:

(a) providing a reactor comprising a combustion chamber having one or more inlets and an outlet,
(b) providing one or more streams of an oxidant and a liquid or gaseous fuel and delivering the oxidant and liquid or gaseous fuel via the one or more inlets to the combustion chamber,
(c) combusting the oxidant and liquid or gaseous fuel in the combustion chamber to form a stream of combustion gas which flows out of the combustion chamber via the outlet,
(d) providing a stream of a liquid feedstock comprising a volatizable non-halogenated metal oxide precursor and injecting the stream of the liquid feedstock into the stream of combustion gas to thereby atomize the liquid feedstock within the stream of combustion gas and form a reaction mixture comprising the combustion gas and the atomized liquid feedstock,
(e) subjecting the atomized liquid feedstock to a sufficient temperature and residence time in the stream of combustion gas for the liquid feedstock to combust or pyrolyze and thereby be converted to fumed metal oxide particles,
(f) reducing the temperature of the stream of combustion gas below the solidifying temperature of the fumed metal oxide particles, and recovering the fumed metal oxide particles.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/720,582Filed 24 Nov 2003 · us provisional application
Priority: 26 Nov 2002
Published: US 2004/0156773 A112 Aug 2004
Granted: 11 Aug 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C01B 13/20
Methods for preparing oxides or hydroxides in general: by oxidation of elements in the gaseous state; by oxidation or hydrolysis of compounds in…
B82Y 30/00
Nanotechnology for materials or surface science
C01B 13/24
Of halides or oxyhalides: in the presence of hot combustion gases
C01B 13/30
Of halides or oxyhalides: removal and cooling of the oxide-containing suspension