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Synthesis method of nano titanium dioxide

A nano-titanium dioxide and synthesis method technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of difficult control of the ratio, complicated post-processing procedures, and potential safety hazards, and achieve good catalytic activity.

Pending Publication Date: 2021-09-07
GUANGZHOU HUIFU RES INST CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] Due to the by-product chlorine gas in the high-temperature oxidation method, the post-treatment process is complicated and there are potential safety hazards; the tail gas treatment of the high-temperature hydrolysis method is relatively easy, so the high-temperature hydrolysis method is common
However, the preparation of nano-titanium dioxide by high-temperature hydrolysis is prone to the problem that the crystal structure is difficult to control, especially for the ratio of anatase and rutile in the mixed crystal form with good catalytic activity prospects. The catalytic activity of nano-titanium dioxide is difficult to break through

Method used

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  • Synthesis method of nano titanium dioxide
  • Synthesis method of nano titanium dioxide
  • Synthesis method of nano titanium dioxide

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preparation example Construction

[0052] A kind of synthetic method of nano titanium dioxide, comprises the following steps:

[0053] The reaction raw materials are vaporized titanium tetrachloride, combustion-supporting gas and hydrogen mixed in the reactor, and the resulting mixture is ignited and enters the reaction furnace for combustion reaction. After the reaction, the obtained reaction product is input into the deacidification device and is flushed with the deacidification medium Carry out deacidification to obtain nano-titanium dioxide;

[0054] The temperature of the deacidification is 280~450°C, and the total time of the deacidification is 50~100min;

[0055] The temperature in the reaction furnace is 250-450°C.

[0056] In the process of preparing nano-titanium dioxide, the present invention finds that to realize the preparation of the rutile-anatase titanium dioxide mixed crystal form with a specific ratio of crystal form, especially to realize the preparation of the mixed crystal form of high-pro...

Embodiment 1

[0085] The device used in this example is figure 1 and figure 2 shown.

[0086] (1) Raw material TiCl 4 It flows into the vaporizer through the high level tank, the temperature of the vaporizer is controlled at 230°C, the outlet temperature of the vaporizer is greater than 150°C, the temperature of titanium tetrachloride is controlled at 160°C after vaporization, and the vaporization rate is 10kg / h;

[0087] (2) Vaporized TiCl 4 , enter the inner ring pipeline of the reactor 1 through the first feed port 14 together with the air after drying (control air carrier gas between 200-500 ℃) after the mass flowmeter metering; The reaction hydrogen is heated by the gas heater to Above 150°C, enter the inner ring pipe of the reactor from the second feed port 15. The flow rate of reaction air is 30kg / h, the flow rate of reaction hydrogen is 0.25kg / h; TiCl 4 1. After mixing air and hydrogen, the gas temperature is 200°C; a gas distribution plate is installed in the inner ring pipel...

Embodiment 2

[0091] The difference between this embodiment and embodiment 1 is:

[0092] In step (2), the flow rate of reaction hydrogen is 0.4kg / h, TiCl 4 1. After mixing air and hydrogen, the gas temperature is 220°C;

[0093] In step (3), the temperature in the reaction furnace 2 is 280° C., the auxiliary gas is air, the flow rate of the auxiliary gas is 5 kg / h, and the flow rate of the cooling gas is 0.2 kg / h.

[0094] Finally, the deacidified sample 2# was obtained.

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Abstract

The invention relates to a synthesis method of nano titanium dioxide. The synthesis method comprises the following steps: mixing reaction raw materials vaporized titanium tetrachloride, combustion-supporting gas and hydrogen in a reactor, igniting the obtained mixture, feeding the ignited mixture into a reaction furnace, carrying out a combustion reaction, after the reaction is completed, inputting the obtained reaction product into a deacidification device, and carrying out deacidification through mutual hedging with a deacidification medium to obtain nano titanium dioxide, wherein the deacidification temperature ranges from 280 DEG C to 450 DEG C, and the total deacidification time ranges from 50 min to 100 min; and the temperature in the reaction furnace ranges from 250 DEG C to 450 DEG C. According to the rutile type coated anatase type nano titanium dioxide provided by the invention, the proportion of anatase type titanium dioxide is high, and the rutile type coated anatase type nano titanium dioxide has efficient photocatalytic activity.

Description

technical field [0001] The invention relates to the field of inorganic chemistry, in particular to a synthesis method of nanometer titanium dioxide. Background technique [0002] Nano-titanium dioxide is a polycrystalline powder, and there are mainly three crystal forms in nature: anatase, rutile and brookite. Among them, neither the brookite type nor the rutile type structure is a stable crystal type, and both can be converted into rutile type at high temperature. Nano titanium dioxide has good photocatalytic performance, and the catalytic activity of anatase titanium dioxide is higher than that of rutile titanium dioxide, and the mixed crystal form of anatase and rutile titanium dioxide has better synergistic catalytic activity. Because titanium dioxide has semiconductor properties, and anatase TiO 2 and rutile TiO 2 There is a certain difference in the energy levels of the conduction band and the valence band. When titanium dioxide absorbs ultraviolet light, the photoe...

Claims

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Application Information

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IPC IPC(8): C01G23/07B82Y40/00
CPCC01G23/07B82Y40/00C01P2006/12
Inventor 段先健吴春蕾申士和李政法杜海晶许仕宇王跃林王成刚胡丹
Owner GUANGZHOU HUIFU RES INST CO LTD
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