A method for pickering-based emulsion solids transport in a microreactor system

A technology of microreactor and microchannel reactor, which is applied in the field of microfluidics, can solve the problems of small solid catalyst particles, easy adhesion, and large surface energy, and achieve the effect of eliminating wall effect, easy transportation, and continuous process

Active Publication Date: 2022-07-01
YANTAI UNIV
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  • 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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  • A method for pickering-based emulsion solids transport in a microreactor system
  • A method for pickering-based emulsion solids transport in a microreactor system
  • A method for pickering-based emulsion solids transport in a microreactor system

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Effect test

Embodiment 1

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

[0034] Before the experiment, the Pickering emulsion was prepared first, and 1.0 ml of methyltrimethoxysilane was used to prepare 20 nm spherical SiO 2 The particles were surface-modified, and the Pickering emulsion was prepared with the ethyl acetate-water experimental system, and the fixed oil-water ratio was 7ml:5ml, and the W / O type Pickering emulsion with a solid particle concentration of 5% was prepared (such as figure 2 The amount of solid particles remained unchanged, 12 ml of ethyl acetate was added, and a homogeneous suspension was prepared by ultrasonic vibration. The flow ratio of the two systems was 1:1, and the flow ra...

Embodiment 2

[0040] Change the solid particle concentration to 10%, and refer to Example 1 for other conditions. The water-Pickering emulsion system forms a stable slug-like flow pattern in the microchannel, and the droplet length of the dispersed phase gradually decreases with the increase of the flow rate; the water-suspension system cannot form a stable slug-like flow pattern in the microchannel. And there is adhesion phenomenon, the droplet length of the dispersed phase decreases gradually with the increase of the flow rate.

Embodiment 3

[0046] Change the solid particle concentration to 15%, and refer to Example 1 for other conditions. The water-Pickering emulsion system forms a stable slug-like flow pattern in the microchannel, and the droplet length of the dispersed phase gradually decreases with the increase of the flow rate; the water-suspension system cannot form a stable slug-like flow pattern in the microchannel. And there is adhesion phenomenon, the droplet length of the dispersed phase decreases gradually with the increase of the flow rate.

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Abstract

The present invention provides a Pickering-based emulsion solids delivery method within a microreactor system. The invention utilizes the characteristics of the solid particles in the Pickering emulsion that are self-assembled and closely arranged on the surface of the emulsion droplets, and realizes the solid transportation by combining the microreactor system and the Pickering emulsion. Compared with the prior art, the introduction of Pickering emulsion in this method can reduce the adhesion or accumulation with the wall surface, avoid clogging, and solve the problem of filling and transporting solid particles at the same time. The dosage of granular emulsifier is small, and it is easy to recycle and reuse. The invention opens up a new way for the micro-chemical technology to be used in the heterogeneous catalysis process.

Description

technical field [0001] The invention relates to a method for conveying solids based on Pickering emulsion in a microreactor system, and belongs 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, solid particles, etc., and has a unique interface particle self-assembly effect, that is, solid particles (usually nano or micron) are used instead of surfactants. The coalescence between droplets is effectively prevented. With the rapid development of materials science that provides many alternative particles, research has found that the use of particles as emulsion stabilizers enables more diverse designs. Furthermore, Pickering emulsions have many unique properties, such as excellent stability and low toxicity, that cannot be achieved with conventional emulsions stabilized with surfactants. When the solid particle is the catalyst, the emulsion is ...

Claims

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Application Information

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Patent Type & Authority Patents(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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