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Preparation method of gas phase nano titanium dioxide with average grain size

A nano-titanium dioxide, gas-phase technology, applied in the direction of titanium dioxide, nanostructure manufacturing, titanium oxide/hydroxide, etc., can solve problems such as uneven temperature field and concentration field, uneven residence time distribution, and easy scarring at the nozzle outlet , to achieve the effect of overcoming uneven temperature field and concentration field, and small particle size

Active Publication Date: 2006-02-22
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, the traditional gas phase combustion to prepare nano-TiO 2 Due to the defects of the combustion reactor, such as uneven temperature field and concentration field, uneven distribution of material residence time in the combustion zone, and easy scarring at the nozzle outlet, it is difficult to prepare by using the existing traditional gas phase combustion method. High-quality, uniform particle size nano-titanium dioxide products

Method used

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  • Preparation method of gas phase nano titanium dioxide with average grain size

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Embodiment

[0029] 12L / h liquid titanium tetrachloride is vaporized by electric heating, and its steam enters the mixer after being dried, purified and preheated, and at the same time there is another H 2 at 9.5m 3 / h and air at 30m 3 The / h gas is also passed into the mixer after being dried and purified. After the mixed gas is preheated to a certain temperature, it is introduced into the central tube of the reactor and ejected at a high speed. The total gas velocity at the outlet of the central tube is 85m / s. Another purified hydrogen is 9.8m 3 / h and air at 20m 3 / h mixed and passed into the second ring of the reactor, after being ignited and sprayed out at a high speed, the total gas velocity at the outlet of the second ring is 65m / s. The three rings of the reactor are at 40m 3 / h and the fourth ring at 100m 3 / h into the purified air to quench the reaction system, the gas velocity at the outlet of the third ring is 31m / s, and the gas velocity at the outlet of the fourth ring tang...

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Abstract

The invention discloses a process for preparing nano titanium dioxide with homogeneous grain sizes, which comprises using titanium tetrachloride, hydrogen and air as raw materials, premixing by a predetermined volumetric ratio, loading into various rings of the premixing combustion reactor for hydrolyzing reaction, growing in flocculator with hot water jacket, finally gathering with a bag filter and carrying out deacidification.

Description

technical field [0001] The invention relates to a method for preparing gas-phase nano titanium dioxide with uniform particle size. Background technique [0002] Nano-titanium dioxide is an important inorganic material with many unique physical and chemical properties, such as large specific surface area, high surface activity, excellent thermal conductivity, light absorption performance and good dispersion, etc. It is widely used in coatings, papermaking, plastics, Printing, chemical fiber, functional ceramics, advanced paint, rubber, cosmetics, catalysts, antibacterial agents, sewage treatment and other industries. The preparation methods of nano titanium dioxide include chemical precipitation method, sol-gel method, microemulsion method and gas phase reaction synthesis. The first three methods directly obtain amorphous or anatase titanium dioxide particles, which need to be calcined to obtain rutile particles. Calcination consumes a lot of energy and easily leads to sinte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/07B82B3/00
Inventor 李春忠胡彦杰蔡平雄丛德滋干路平
Owner EAST CHINA UNIV OF SCI & TECH
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