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Fumed metal oxide particles and process for producing the same

A technology of oxide particles and oxides, applied in the preparation of alumina/hydroxide, chemical instruments and methods, silicon oxide, etc., can solve problems such as expensive processing steps

Inactive Publication Date: 2006-02-22
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method produces metal oxide particles of satisfactory quality, it often includes costly post-product processing steps, such as removal of acids produced by the combustion of halogenated raw materials

Method used

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  • Fumed metal oxide particles and process for producing the same
  • Fumed metal oxide particles and process for producing the same
  • Fumed metal oxide particles and process for producing the same

Examples

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Embodiment 1-4

[0046] These examples illustrate the method of making fumed metal oxide particles according to the invention. In particular, these examples illustrate four methods for producing fumed silica particles with different surface areas. Use as above and asfigure 1 The described pilot scale reactor was used for the following process. refer to figure 1 , the approximate dimensions of the pilot scale reactor are as follows: D1 = 18.4 cm, D2 = 9.7 cm, D3 = 69 cm, and L1 = 213 cm. The liquid feedstock was commercially available octamethylcyclotetrasiloxane (OMTS) and the combustion gas flow was established by burning a mixture of air and natural gas. The amounts of air, natural gas, and OMTS used in each method are shown in Table 1. In the constriction 14 of the reactor (i.e., figure 1 The portion with diameter D2 in ) injects liquid feedstock (i.e. OMTS) into the combustion gas stream and uses water (which is in figure 1 The D position in is introduced into the reactor) to quench t...

Embodiment 5

[0052] This example demonstrates the unique particle size characteristics of the fumed silica particles of the present invention. The fumed silica granules of Examples 1-4 were analyzed according to the method described here to determine the primary Particle size d and aggregate size D of 2000 aggregates circ . Then calculate the average primary particle size d ave , average aggregate size D circ ave , and the geometric standard deviation σ of the aggregate size g (D circ ). Specifically, using the BET surface area (SA) measurement and the equation: d ave (nm)=1941 / SA(m 2 / g) Determination of the mean value d of the primary particle size of the fumed silica particles ave . Measure the area A of each aggregate using TEM image analysis and use the equation D circ = 4 A / π Calculate aggregate size D circ to determine the aggregate size D circ . Accordi...

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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.

Description

technical field [0001] The present invention relates to metal oxide particles and methods for their manufacture. Background technique [0002] Metal oxide particles have found widespread use in industry. For example, in the semiconductor industry, metal oxide particles are used as abrasives in polishing compounds. Metal oxides are also used in the preparation of coating components, such as paints, and in the manufacture of ink recording media. [0003] Various methods for producing metal oxide particles have been disclosed. For example, U.S. Patent 3,322,499 (Carpenter et al.) discloses the preparation of pyrogenic metal oxides by high temperature oxidation of volatile metal compounds such as metal halides or oxyhalides. While this method produces metal oxide particles of satisfactory quality, it often includes costly post-product treatment steps, such as removal of acids produced by the combustion of halogenated feedstock. [0004] Therefore, there is a need for a proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/34C01B33/18C01F7/30C01B3/20C01B13/20C01B13/24C01B13/30
CPCC01P2006/12C01B33/183C01B13/30C01P2004/64C01P2002/60B82Y30/00C01P2004/50C01P2004/62C01B13/24C01B13/20
Inventor 亚科夫·E·库索夫斯基
Owner CABOT CORP
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