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Auxiliarily burning reactor and its application in vapor process of preparing nano SiO2

A technology of combustion reaction and assisted combustion, applied in the direction of silicon oxide, etc., can solve the problems of difficulty in preparing high-quality nano-SiO2 products, uneven residence time distribution, uneven temperature field and concentration field, etc.

Inactive Publication Date: 2004-11-24
EAST CHINA UNIV OF SCI & TECH +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The advantages of this type of reactor are simple structure, convenient manufacture and maintenance, but there are uneven temperature field and concentration field in the combustion reaction zone, uneven distribution of material residence time in the combustion reaction zone, and easy scarring and blockage at the outlet of the nozzle. Defects, therefore, it is difficult to prepare high-quality nano-SiO using the existing auxiliary combustion reactor 2 product

Method used

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  • Auxiliarily burning reactor and its application in vapor process of preparing nano SiO2
  • Auxiliarily burning reactor and its application in vapor process of preparing nano SiO2
  • Auxiliarily burning reactor and its application in vapor process of preparing nano SiO2

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Embodiment

[0027] The liquid silicon tetrachloride is vaporized by electric heating, and its steam is mixed with the dried, purified and preheated air into the mixer through the tee, and at the same time, the hydrogen gas is also passed into the mixer after being dried and purified. After the three gases are pre-mixed according to the reaction theoretical ratio (considering that the first-time mixing is not necessarily uniform, so two mixers are connected in series), they are introduced into the central tube of the reactor and ejected at high speed, and the total gas velocity at the central tube outlet is 76.2 m / s (hydrogen, Air and silicon tetrachloride vapor according to the chemical ratio), ignition combustion reaction. Because the flame combustion of the above-mentioned mixed gas is easy to extinguish, so another purified air and excess hydrogen are mixed through a tee and then passed into the second ring of the reactor. "Long-lived fire" to ensure the stable burning of the central f...

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Abstract

The auxiliarily combustion reactor of the present invention has improved nozzle structure, and the vapor process of preparing nano SiO2 is superior to available process, which has non-homogeneous temperature field and concentration field in combustion reactor, uneven retention time of material in the combustion reaction area, and easy scaling in the nozzle outlet and other demerits. The present invention has raised nano SiO2 product quality.

Description

technical field [0001] The invention relates to a reactor for preparing nanometer particles and its application, in particular to an auxiliary combustion reactor and its application in preparing nano silicon dioxide by gas phase method. Background technique [0002] nano-SiO 2 It is a widely used nanoparticle product, which is widely used in the fields of rubber, coatings, plastics, medicine, adhesives, inks, pesticides, catalysis, electronics and fine ceramics. [0003] Preparation of nano-SiO by vapor phase method 2 is the use of silicon tetrachloride (SiCl 4 ) steam is produced by high-temperature hydrolysis in a hydrogen-oxygen flame, and its reaction equation is as follows: [0004] <chemistry num="001"> <chem file="03116946_cml001.xml" / > < / chemistry> [0005] <chemistry num="002"> <chem file="03116946_cml002.xml" / > < / chemistry> [0006] or <chemistry num="003"> <chem file="03116946_cml003.xml" / > < / chem...

Claims

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Application Information

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IPC IPC(8): C01B33/113
Inventor 李春忠张祖钧丛德滋岳群干路平胡彦杰
Owner EAST CHINA UNIV OF SCI & TECH
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