Preparing method for nano titanium dioxide

A nano-titanium dioxide and titanium raw material technology, applied in titanium dioxide, titanium oxide/hydroxide, chemical/physical/physical-chemical mobile reactors, etc., can solve the problem of slow speed, reduce the volume, strengthen the mass transfer process, The effect of shortening the reaction time

Inactive Publication Date: 2004-04-21
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is slow (Chemical Journal of Chinese Universities, 20(3): 467-469)

Method used

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  • Preparing method for nano titanium dioxide
  • Preparing method for nano titanium dioxide
  • Preparing method for nano titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] TiCl 4 As a precursor, ammonia is used as an alkaline gas to prepare nano-titanium dioxide image 3 The process flow shown.

[0042] Prepare TiCl with a concentration of 0.2mol / L 4 Solution, placed in the stirring tank 13. Turn on pump 12 to make TiCl 4 The solution flows through the regulating valve 11, the liquid flow meter 10, and enters the filler 8 through the inlet 6 through the liquid distributor 9, and flows from the inner edge of the rotor to the outer edge to control the TiCl 4 The flow rate of the solution is 200L / h; after the ammonia gas is decompressed from the gas source of the steel cylinder, it passes through the regulating valve 1 and the gas flow meter 2, and continuously enters the rotating bed from the air inlet 4, and flows from the outer edge of the rotor to the inner edge. It is 400L / h. TiCl 4 The solution and ammonia gas are in reverse contact in the filler layer of the rotor, neutralization and hydrolysis reactions occur, and hydrated tita...

Embodiment 2

[0046] Except following change, all the other are the same as embodiment 1.

[0047] The precursor was changed to Ti(SO 4 ) 2 , the concentration is 0.2mol / L, the flow rate is 200L / h, the obtained nano-titanium dioxide is also anatase type, and the particle size is about 20nm, such as Image 6 shown.

Embodiment 3

[0049] TiCl 4 As the precursor, ammonia water is used as the lye to prepare nano-titanium dioxide Figure 4 The process flow shown. Prepare TiCl with a concentration of 0.2mol / L 4 The solution is placed in the stirred tank 1, and the ammonia water with a concentration of 2.5% is placed in the stirred tank 8. After turning on pump 3 and pump 7 at the same time, the TiCl 4 The solution and ammonia water flow into the supergravity rotating packed bed reactor at the same time (such as figure 2 shown). TiCl 4 The solution and ammonia mix vigorously in the filler and react to form hydrated titanium dioxide. The reaction product leaves the high-gravity rotating bed reactor through the liquid outlet 5 after being thrown out from the filler. During the reaction TiCl 4 The flow rates of the solution and ammonia water were both 200 L / h, the rotational speed of the rotary bed rotor was 1200 r / min, and the reaction was carried out at room temperature.

[0050] The hydrated titani...

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Abstract

A process for preparing nano-class TiO2 by use of supergravitational rotating packed-bed reactor includes such steps as neutralizing-hydrolyzing reacting of TiCl4 or titanium oxygen sulfate to obtain hydrated TiO2, drying and calcining. Its advantages are uniform granularity, and high dispersity and productivity.

Description

[0001] The invention relates to a method for preparing nano titanium dioxide under the condition of high gravity in a rotating packed bed. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is an indispensable raw material for electronics, chemical industry, metallurgy and other industries. Due to the quantum effect and small size effect, nano titanium dioxide produces physical and chemical properties that ordinary titanium dioxide does not have, thus showing a broad application prospect. For example: nano-titanium dioxide can be used as a photocatalyst to degrade organic wastewater, harmful gases in the air, etc., and its activity is much higher than that of ordinary titanium dioxide; using its transparency and ability to scatter ultraviolet rays, it can be used as food packaging materials, wood protection paint, artificial Fiber additives, cosmetic sunscreens, etc.; using its photoconductivity and photosensitivity, titanium dioxide photosensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/28C01G23/047C01G23/053
Inventor 陈建峰邵磊张春光陈建铭初广文
Owner BEIJING UNIV OF CHEM TECH
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