Solid conveying method based on Pickering emulsion in microreactor system

A microreactor and microchannel reactor technology, applied in the field of microfluidics, can solve the problems of small solid catalyst particles, easy adhesion, channel blockage, etc., to achieve the elimination of wall effects, easy transportation, and reduced operating pressure drop Effect

Active Publication Date: 2021-06-29
YANTAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solid catalyst particles are small in size and large in surface energy, and are prone to adhesion when in contact with the channel wall, which can lead to channel blockage in severe cases.
[0005] Avoiding channel blockage on the basis of utilizing the advantages of micro-suspended bed reactors has become the development direction for stable operation of heterogeneous selective oxidation reactions and improving performance of micro-channel reactors. However, the technology of using Pickering emulsion to transport solids has not been reported.

Method used

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  • Solid conveying method based on Pickering emulsion in microreactor system
  • Solid conveying method based on Pickering emulsion in microreactor system
  • Solid conveying method based on Pickering emulsion in microreactor system

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In order to verify the effect of the present invention, the material of the microreactor is quartz glass, the cross-sectional size of the channel is 0.3 mm × 0.3 mm, and a T-shaped convective microchannel is used. In order to better observe the flow pattern, a small amount of Sudan red is added to ethyl acetate for dyeing.

[0034] Before the experiment, the Pickering emulsion was first prepared, and 1.0 ml methyltrimethoxysilane was selected to react with 20 nm spherical SiO 2 Particles are surface modified, and the Pickering emulsion is prepared with the ethyl acetate-water experimental system, and the fixed oil-water ratio is 7ml:5ml, and the W / O type Pickering emulsion with a solid particle concentration of 5% is prepared (such as figure 2 shown); the amount of solid particles remains the same, 12 ml of ethyl acetate is added, and ultrasonic vibration is used to prepare a homogeneous suspension. The flow ratio of the two systems was 1:1, and the flow rate of the di...

Embodiment 2

[0040] Change the solid particle concentration to 10%, and all the other conditions are described in Example 1 with reference to. The water-Pickering emulsion system formed a stable slug-like flow pattern in the microchannel, and the length of the dispersed phase droplets gradually decreased with the increase of the flow rate; the water-suspension system could not form a stable slug-like flow pattern in the microchannel. And there is adhesion phenomenon, and the length of dispersed phase droplet basically decreases gradually with the increase of flow rate.

Embodiment 3

[0046] Change the solid particle concentration to 15%, and all the other conditions are referred to in Example 1. The water-Pickering emulsion system formed a stable slug-like flow pattern in the microchannel, and the length of the dispersed phase droplets gradually decreased with the increase of the flow rate; the water-suspension system could not form a stable slug-like flow pattern in the microchannel. And there is adhesion phenomenon, and the length of dispersed phase droplet basically decreases gradually with the increase of flow rate.

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Abstract

The invention provides a solid conveying method based on Pickering emulsion in a microreactor system. The characteristic that solid particles in the Pickering emulsion are self-assembled and tightly arranged on the surfaces of emulsion droplets is utilized, and solid conveying is achieved in the mode that the microreactor system and the Pickering emulsion are combined. Compared with the prior art, the method has the advantages that the Pickering emulsion is introduced, adhesion or accumulation with the wall surface can be reduced, blockage is avoided, meanwhile, the problems of filling and conveying of solid particles are solved, the Pickering emulsion is basically not affected by the external environment temperature and the salt ion concentration, and the particle emulsifier is small in dosage and easy to recycle and reuse. The invention opens up a new way for applying a micro-chemical technology to a heterogeneous catalysis process.

Description

technical field [0001] The invention relates to a pickering emulsion-based solid delivery method in a microreactor system, belonging to the technical field of microfluidics. Background technique [0002] Pickering emulsion is formed by high-speed homogenization or ultrasonic emulsification of water phase, oil phase, and solid particles. It has a unique interfacial particle self-assembly effect, that is, solid particles (usually nano or micron) are used instead of surfactants. Effectively prevent the coalescence of droplets. With the rapid development of materials science that offers many alternative particles, it is found that many more different designs can be realized by using particles as emulsion stabilizers. Moreover, Pickering emulsions have many unique properties, such as excellent stability and low toxicity, which cannot be achieved by conventional emulsions stabilized with surfactants. When the solid particle is the catalyst, the emulsion is exactly the oil, water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00
CPCB01J19/0093B01J2219/00891
Inventor 赵玉潮孙文星金楠王清强
Owner YANTAI UNIV
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