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Preparation method of SiO2 micro-nanosphere and micro-reaction system

A micro-nanosphere and microreaction technology, applied in nanotechnology, silicon dioxide, silicon oxide, etc., can solve the problems of low mass transfer mixing and dispersion strength, limiting the application of microreactors, and uneven microsphere particles, etc. Stable product performance, high processing cost and uniform morphology

Active Publication Date: 2013-03-13
SHENZHEN ACAD OF AEROSPACE TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ammonia-catalyzed preparation of SiO from ethyl orthosilicate in alcohol-water system 2 Micro-nanospheres are commonly used SiO 2 The preparation method of micro-nanospheres, due to the fast hydrolysis speed of ammonia-catalyzed tetraethyl orthosilicate, puts forward high requirements on the mass transfer speed and uniform mixing degree of materials in the reaction process. The mixing and dispersion strength of the mixture is low, resulting in the prepared SiO 2 Inhomogeneous microsphere particles, wide size distribution, severe agglomeration, difficult to control the shape
The newly developed microreactor has strong mass transfer capacity and mass transfer efficiency, but it is used in liquid phase reaction, especially in the liquid phase reaction that produces precipitation, there are problems such as large pressure difference, easy to block, difficult to mass production, etc., serious Limits the application of microreactors in liquid phase reactions that produce precipitation

Method used

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  • Preparation method of SiO2 micro-nanosphere and micro-reaction system
  • Preparation method of SiO2 micro-nanosphere and micro-reaction system
  • Preparation method of SiO2 micro-nanosphere and micro-reaction system

Examples

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Embodiment 1

[0032]This example provides a kind of micro reaction system, comprises a unit reaction device, and described unit reaction device is made up of feeding device, strengthened micro reaction device 3 and storage tank 5, and described feeding device is made up of liquid tank 1 and constant flow The pump 2 is connected to form, and the enhanced micro-reaction device 3 includes a micro-reactor 6 and an ultrasonic generator 9 staggered outside the reactor 6; The feed tank 5 is connected to the discharge port of the enhanced micro-reaction device 3 through a connecting pipe. Further, the enhanced micro-reaction device 3 also includes an ultrasonic groove, the ultrasonic groove surrounds the outside of the micro-reactor 6, and the ultrasonic generator 9 is installed in the ultrasonic groove. The ultrasonic tank is composed of an inner tank 7 and an outer tank 8 connected together. The ultrasonic generators 9 are evenly staggered and installed in the outer tank 8; the entire microreacto...

Embodiment 2

[0038] The two reaction unit devices described in Embodiment 1 are combined into a micro-reaction system according to the series connection. In the two liquid tanks of the first reaction unit device, an absolute ethanol solution with a molar concentration of tetraethyl orthosilicate of 0.8 mol / L, and a water molar concentration of 8 mol / L and an ammonia molar concentration of 1.6 mol / L are respectively arranged. mixed solution of absolute ethanol. Similarly, an absolute ethanol solution having a molar concentration of ethyl orthosilicate of 0.4 mol / L was configured in the liquid tank of the second reaction unit device. Then pass 30°C circulating water into the enhanced micro-reaction device of the first reaction unit device, and turn on and adjust the ultrasonic frequency to 25KHz, and the ultrasonic power to 200W, then turn on the two constant flow pumps of the first reaction unit device, and Control the flow rate of the two solutions to be 1.2L / min. After the reaction was ...

Embodiment 3

[0040] The four reaction unit devices described in Embodiment 1 are combined into a micro-reaction system according to the series connection. In the two liquid tanks of the first reaction unit device, configure an anhydrous ethanol solution with a molar concentration of tetraethyl orthosilicate of 1.0 mol / L, and an ethanol solution with a molar concentration of water of 11 mol / L and a molar concentration of ammonia of 2.1 mol / L. Anhydrous ethanol mixed solution. Similarly, in the liquid tank of the second reaction unit device, the molar concentration of ethyl orthosilicate is an absolute ethanol solution of 0.3mol / L, and the molar concentration of ethyl orthosilicate is configured in the liquid tank of the third reaction unit device. It is 0.45mol / L dehydrated ethanol solution, and the dehydrated ethanol solution whose molar concentration of ethyl tetrasilicate is 0.6mol / L is arranged in the liquid tank of the fourth reaction unit device. Then pass 35°C circulating water into...

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Abstract

The invention provides a preparation method of a SiO2 micro-nanosphere and a micro-reaction system. The micro-reaction system comprises a feeding device, an reinforced micro-reaction device and a stock chest, wherein the feeding device comprises a liquid groove and a constant current pump; the reinforced micro-reaction device comprises a micro-reactor and an ultrasonic generator; and the liquid groove of the feeding device is connected with the feeding port of the reinforced micro-reaction device, and the stock chest is connected with the discharge hole of the reinforced micro-reaction device. The double advantages of the micro-reactor and ultrasonic wave are cooperatively applied in the micro-reaction system, and the problems that the typical micro-reactor is big in differential pressure, is easy to jam, is difficult to product in quantity and the like when in liquid precipitation reaction. By using the preparation method, the controllable preparation of the SiO2 micro-nanoshpere in size and yield is achieved, the obtained SiO2 micro-nanoshpere is narrow in size, good in dispersibility and uniform in topography. The method has the advantages of simple process, strong operation controllability, stable production property and small investment, and is easy to enlarge and suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of micro-nano powder preparation, and specifically relates to a SiO 2 Preparation method of micro-nanosphere and micro-reaction system. Background technique [0002] Monodisperse micro-nano SiO 2 It is an amorphous spherical particle with uniform size distribution. It is widely used in photonic crystals, orderly assembled macroporous catalytic materials, chromatographic packing, biological materials, rheology research and other fields. In addition, micro-nano SiO 2 It is also an important chemical raw material and belongs to fine chemical products. It is a kind of micro-nano powder with the highest output in large-scale industrial production in the world. It is widely used in construction, chemical industry, light industry, textile, electronics, machinery, food, medicine, materials, It has important applications in aerospace, agriculture, etc., and enjoys the reputation of "industrial monosodium glutamate...

Claims

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Application Information

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IPC IPC(8): C01B33/18B82Y40/00
Inventor 万军喜曹海琳李霞张锦锋
Owner SHENZHEN ACAD OF AEROSPACE TECH
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