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Method for enhancing gas-liquid process in micro-reactor

A micro-reactor, gas-liquid technology, applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physical chemical processes, etc., can solve problems such as poor mass transfer effect, to prevent dredging blockage, gas absorption rate Improved effect

Active Publication Date: 2014-11-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is generally only applicable to occasions where the flow rate is relatively high, and the mass transfer effect is relatively poor when the flow rate is relatively low.

Method used

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  • Method for enhancing gas-liquid process in micro-reactor
  • Method for enhancing gas-liquid process in micro-reactor

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1 gas-liquid physical absorption process strengthening

[0023] This embodiment takes the use of ultrasound to strengthen the physical absorption process in a gas-liquid microreactor as an example. In the liquid inlet channel 1 of the microchannel, deionized water was introduced with a flow rate of 2ml / min, and pure carbon dioxide was introduced into the gas inlet channel 2 with a flow rate of 1.65ml / min. like figure 2 As shown, the injected gas forms a continuous slug flow in the main channel 3, and the transverse equivalent diameter of the bubbles is about 1000 μm. When no ultrasound is added, the absorption rate is 26.7% due to the absorption of carbon dioxide by water. When the working frequency is 20kHz and the sound intensity is 1.5W / cm 2 During ultrasonication, the gas-liquid mass transfer is accelerated, and the absorption rate of carbon dioxide is 56.3%. According to the mass transfer model, the gas-liquid total volume mass transfer coefficient ...

Embodiment 2

[0024] Embodiment 2 gas-liquid chemical absorption process intensification

[0025] This embodiment takes the use of ultrasound to strengthen the chemical absorption process in a gas-liquid microreactor as an example. In the liquid inlet channel 1 of the microchannel, 20% mass fraction of monoethanolamine MEA (molecular formula NH 2 CH 2 CH 2 OH) solution, the flow rate is 1ml / min, and 10% carbon dioxide gas (the balance gas is nitrogen gas) is introduced into the gas inlet channel 2, and the flow rate is 20ml / min. The cross-sectional diameter is about 900 μm. After the gas and the MEA solution pass into the main channel 3, they contact each other for mass transfer and chemical reaction occurs so that carbon dioxide is chemically absorbed by the MEA solution. The material that has been reacted at the outlet of the reactor is separated from gas and liquid by a commonly used gas-liquid separation tank, and the concentration of carbon dioxide in the gas is measured by a carbo...

Embodiment 3

[0026] Embodiment 3, the gas-liquid reaction process strengthening of generating solid

[0027] In this embodiment, the gas-liquid reaction process of solid formation is strengthened by ultrasound in a gas-liquid microreactor as an example. In the liquid inlet channel 1 of the microchannel, 5% (NH 4 ) 2 SiF 6 Solution, flow rate 10ml / min, feed pure NH in gas inlet channel 2 3 Gas, flow rate 10ml / min. (NH 4 ) 2 SiF 6 solution and NH 3 After the gas is passed into the main channel 3, a slug flow is formed, and the mass transfer occurs through contact with each other, and a chemical reaction occurs to form silicon oxide solid particles. When no ultrasound is applied, the silicon oxide solid particles generated in the main channel 3 are deposited on the wall of the channel, and accumulate more and more over time, and the pressure drop gradually increases accordingly. After about 15 minutes, channel 3 is blocked, and the pressure drop rises to 0.95MPa (see figure 2), no ...

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Abstract

The invention relates to a method for enhancing a gas-liquid process in a micro-reactor. The method comprises the following steps: applying ultrasound of a specific frequency to a gas-liquid micro-reactor in which gas liquid two-phase flow is bubble flow, slug flow, slug annular flow, stirring flow or annular flow; and regulating and controlling the transverse equivalent diameter of a gas phase in the gas-liquid two-phase flow and the ultrasonic frequency till a product of the ultrasonic frequency and the transverse equivalent diameter of the gas phase is up to 1-40 mm.kHz. According to the method, disturbance and acoustic streaming are caused in liquid by using the ultrasound and the cavitation effect of the gas phase, so that gas-liquid mass transfer is enhanced; and meanwhile, agglomeration between a solid or a sticky substance in fluid or the adhesion to the wall surface of a micro channel can be broken, so that blockage is prevented and dredged. The method for enhancing the gas-liquid process disclosed by the invention is suitable for the fields of various gas-liquid reactions, gas absorption, gas separation and purification, and the like.

Description

technical field [0001] The invention belongs to the fields of chemical process strengthening method, chemical equipment, ultrasonic application, etc., and specifically relates to a method for using ultrasonic to strengthen gas-liquid mass transfer in a microchannel while preventing 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 gas-liquid contactors or reactors, such as stirred tanks, bubble columns, falling film contactors, etc., gas-liquid microreactors have high specific surface area, fast heat and mass transfer, safe operation, easy scale-up, and Advantages such as small space. Therefore, the gas-liquid microreactor has broad application prospects in the fields of gas-liquid reaction, gas absorption, gas separation and purification. [0003] But ...

Claims

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Application Information

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IPC IPC(8): B01J19/10B01J19/00
Inventor 陈光文董正亚袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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