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A method of enhancing fluid mixing in a microreactor

A technology of fluid mixing and micro-reactor, which is applied in the fields of ultrasonic application, chemical equipment, and chemical strengthening methods. It can solve the problems that the ultrasonic strengthening effect is difficult to run stably for a long time, the ultrasonic strengthening effect is poor, and the processing cost is high. Two-phase mixing effect, prevention and dredging of clogging, effect of simple microchannel structure

Active Publication Date: 2017-04-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, when the flow rate is high, the ultrasonic enhancement effect of a limited number of bubbles is poor, and it is necessary to process a large number of chambers, grooves and other structures on the wall of the microchannel to ensure the ultrasonic enhancement effect. Once the size is processed, it cannot be adjusted again
In addition, the ultrasonic enhancement effect of this method is difficult to operate stably for a long time

Method used

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  • A method of enhancing fluid mixing in a microreactor
  • A method of enhancing fluid mixing in a microreactor
  • A method of enhancing fluid mixing in a microreactor

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, the mixing process of the bubbly flowing fluid is strengthened

[0028] In this embodiment, the continuous introduction of bubbly flow bubbles into a microreactor to enhance fluid mixing is taken as an example. In order to observe the effect of ultrasonically enhanced mixing, deionized water and a solution made of deionized water and ink were respectively passed into the two liquid inlet channels 1 and 2 of the microchannel, and the flow rate was 5ml / min; in the gas inlet channel 3 Into the air, the flow rate is 1ml / min such as figure 2 As shown, the injected air forms a bubble-like flow in the main channel 4, and the lateral size of the bubbles is about 300 μm. Without ultrasound, the ink and water flow along both sides of channel 4 and mix poorly. When 20 kHz is applied in the microreactor, the sound intensity is 1.5W / cm 2 After the ultrasonic wave, that is, the product of the ultrasonic frequency f and the gas phase transverse equivalent diameter d ...

Embodiment 2

[0029] Embodiment 2, Slug flow fluid mixing process strengthening

[0030] In this embodiment, the continuous introduction of slug-like air bubbles into the microreactor to enhance fluid mixing is taken as an example. In the two liquid inlet channels 2 and 1 of the microchannel, the deionized water and the solution made of deionized water and ink are respectively introduced, and the flow rate is 1ml / min; the air is introduced into the gas inlet channel 3, and the flow rate is 2ml / min. like Figure 4 As shown, the injected air forms a slug flow in the main channel 4, and the lateral size of the bubbles is about 1000 μm. Without ultrasound, the ink and water flow along both sides of channel 4 and mix poorly. When ultrasound is applied in the microreactor, the mixing effect of water and ink in channel 4 is significantly enhanced, see Figure 5 . Figure 5 Ultrasonic frequency 18 kHz, sound intensity 1.5W / cm 2 When the mixing effect of water and ink, the product of ultrason...

Embodiment 3

[0031] Embodiment 3, liquid-liquid precipitation reaction process strengthening

[0032] In this embodiment, bubble-like flow bubbles are continuously introduced into the microreactor through the gas inlet to prevent and clear microchannel blockage. The two liquid inlet channels 1 and 2 of the microchannel are respectively fed with a zinc nitrate solution and a sodium carbonate solution, and the two solutions enter the main channel 4 and then mix and react to form zinc carbonate solid particles. The flow of zinc nitrate solution and sodium carbonate solution is 50ml / min, and the concentration is 0.5mol / L; in the gas inlet channel 3, the air flow rate is 10ml / min, and the air that is introduced forms bubbles in the main channel 4 Shaped flow, the lateral size of the bubbles is about 300 μm. Image 6 It is the curve of the pressure drop with time when the reactor is running. When no ultrasound is applied, the zinc carbonate solid particles generated in the microchannel 4 are d...

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Abstract

The present invention relates to a method for enhancing the mixing of multiple fluids in a microreactor. In the method, bubbles are continuously introduced into the fluid through one or more gas inlets arranged in the microchannel, and ultrasonic waves of a specific frequency and power are applied at the same time. Vigorous turbulence is caused in the medium to enhance the mixing between fluids, prevent and unclog blockages.

Description

technical field [0001] The invention belongs to the fields of chemical strengthening method, chemical equipment, ultrasonic application, etc., and specifically relates to a method for using ultrasonic to strengthen fluid mixing in a microchannel, preventing and dredging blockage. Background technique [0002] Microreactors refer to chemical equipment with internal structural feature sizes ranging from several microns to several millimeters. Such internal structures are also commonly referred to as microchannels. Compared with traditional large-scale chemical equipment, microreactor has the advantages of high specific surface area, fast heat and mass transfer, safe operation, easy to scale up, and small footprint, making microreactor one of the most promising chemical technologies. [0003] However, there are also some new problems that need to be solved urgently in the development process of microreactor technology. Due to the small size of the microchannel, the flow is us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00B01F11/02
Inventor 陈光文董正亚袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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