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Deacidification method for vapor process of preparing nano SiO2

A technology of nano-silica and deacidification method, applied in the field of deacidification, can solve problems such as unsatisfactory deacidification effect and influence on product quality, and achieve the effect of good contact condition and fast deacidification time

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

AI Technical Summary

Problems solved by technology

The latter deacidification method artificially introduces impurities and affects product quality; while the first method has been proved to be unsatisfactory in deacidification effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Fluidizing gas (H 2 The volume ratio of air and air is 1:20) preheated to 600-700 ° C, and then passed through the ceramic ring evenly distributed to the fluidized section to the nano-SiO added from the upper part of the fluidized tower 2 Perform fluidized deacidification, the temperature of fluidized deacidification is 300°C, the fluidization gas velocity is 5cm / s, the fluidization expansion rate is 3, and the nano-SiO after fluidized deacidification for 30 minutes 2 The material is discharged from the outlet at the lower part of the fluidized tower for product analysis.

[0015] Product Analysis Results:

[0016] Before deacidification: nano-SiO 2 pH: 2.50, with H 2 O: 2.0%, specific surface area 201m 2 / g;

[0017] After deacidification: nano-SiO 2 pH: 4.19, containing H 2 O: 1.0%, specific surface area 200m 2 / g.

Embodiment 2

[0019] Fluidizing gas (H 2 The volume ratio of air and air is 1:10) preheated to 600-700 ° C, and then passed through the ceramic ring evenly distributed to the fluidized section to the nano-SiO added from the upper part of the fluidized tower 2 Carry out fluidized deacidification, the temperature of fluidized deacidification is 500°C, the fluidized gas velocity is 15cm / s, the fluidized expansion rate is 6, and the nano-SiO after fluidized deacidification for 90 minutes 2 The material is discharged from the outlet at the lower part of the fluidized tower for product analysis.

[0020] Product Analysis Results:

[0021] Before deacidification: nano-SiO 2 pH: 1.90, containing H 2 O: 4.6%, specific surface area 460m 2 / g;

[0022] After deacidification: nano-SiO 2 pH: 4.26, containing H 2 O: 2.0%, specific surface area 459m 2 / g.

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PUM

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Abstract

The deacidification method adopts the gas mixture obtained via hydrogen combustion as fluidizing gas to deacidify nano SiO2 inside the fluidizing reactor, with the fluidizing deacidification temperature being 300-500 deg.c, fluidizing gas speed being 2-15 cm / s, pH value of SiO2 after deacidification being greater than 4 and water content being lower than 2%.

Description

technical field [0001] The present invention relates to a kind of deacidification method, specifically, relate to a method for preparing nano silicon dioxide (SiO 2 ) deacidification method. Background technique [0002] Nano-SiO prepared by vapor phase method 2 It is a high-tech inorganic fine chemical product. Due to the unique properties of nanomaterials, it is widely used in many industrial fields such as rubber, coatings, adhesives, cosmetics, inks, plastics, and medicine. It has a very broad development prospect. of nanomaterials. [0003] Preparation of nano-SiO by vapor phase method 2 made of silicon tetrachloride (SiCl 4 ) is prepared through high-temperature hydrolysis reaction, and its reaction formula is as follows: [0004] <chemistry num="001"> <chem file="03116947_cml001.xml" / > < / chemistry> [0005] It can be seen from the above reaction formula that with SiO 2 At the same time, a large amount of hydrogen chloride (HCl) gas is prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14C01B33/18
Inventor 干路平岳群丛德滋张祖钧李春忠蔡平雄毛英俊
Owner EAST CHINA UNIV OF SCI & TECH
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