Membrane dispersion type micro-channel reactor

A channel reactor and reactor technology, applied in chemical instruments and methods, chemical/physical/physicochemical processes, chemical/physical processes, etc., can solve the problem that the mixed characteristic fluid layer is not well controlled and lacks micro-size restrictions , large particle size and other problems, to achieve the effect of low operating cost, increased cross-sectional area, and simple operation

Active Publication Date: 2009-05-20
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

Because the extractor is for the purpose of extraction and lacks the micro-size restriction after fluid contact, it is not suitable for the process of rapid reaction synthesis of nanoparticles, such as CN 1318429A, a method for preparing ultrafine particles by membrane dispersion, that is, using Use this type of reactor to prepare barium sulfate particles, disperse

Method used

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  • Membrane dispersion type micro-channel reactor
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  • Membrane dispersion type micro-channel reactor

Examples

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Embodiment 1

[0018] Embodiment 1: adopt BaCl 2 and Na 2 SO 4 Preparation of ultrafine barium sulfate particles in a liquid phase reaction system.

[0019] 1) Dissolve barium chloride in deionized water with a concentration of 0.35mol / L as the dispersed phase. Dissolve sodium sulfate in deionized water at a concentration of 0.1 mol / L as the continuous phase. Using the reactor of the present invention, the outer diameter of the inner tube is 15 millimeters, the inner diameter of the outer tube is 16.5 millimeters, the radial spacing of the annular microchannels formed is 750 microns, and one end of the inner tube circumferentially distributes microporous membranes with a diameter of 40 microns , The porosity is 30%.

[0020] 2) The barium chloride solution enters the inner tube from the inlet under the action of the peristaltic pump, and disperses into the continuous phase through the micropores to form micron-scale droplets. The inlet volume flow rate of barium chloride is 2L / min, sodiu...

Embodiment 2

[0022] Example 2: Preparation of ultra-fine cefuroxime axetil particles using a solvent-anti-solvent system.

[0023] 1) Dissolve cefuroxime axetil in acetone at a concentration of 10g / 100ml as the dispersed phase. The anti-solvent, deionized water, was used as the continuous phase.

[0024] 2) The outer diameter of the inner tube is 15 millimeters, the inner diameter of the outer tube is 16 millimeters, the radial spacing of the annular microchannel is 500 microns, and one end of the inner tube is a microporous membrane with a pore diameter of 5 microns distributed along the circumferential direction, and the opening rate is 55%.

[0025] 3) The cefuroxime axetil acetone solution is dispersed into the continuous phase through the micropores under the action of the peristaltic pump to form micron-scale droplets, and its inlet volume flow rate is 300ml / min. It is 6L / min. The cefuroxime axetil in the droplet contacts with water, the cefuroxime axetil reaches supersaturation i...

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Abstract

The invention provides a membrane dispersion microchannel reactor. An outer pipe and an inner pipe form a bushing, an annular microchannel is formed between the inner pipe and the outer pipe, and the outer pipe is provided with a fluid inlet and a fluid outlet; and one end of the inner pipe is provided with a fluid inlet, while the other end is distributed with a micrporous membrane with a plurality of micropores along the circumferential direction of the pipe wall. Compared with the prior microchannel reactor, the cross section of the channel of the reactor is increased, and the treatment capacity is increased. The mixing and the mass transfer between fluids are strengthened. The stronger micromixing is also guaranteed when the large treatment capacity is achieved. Particularly the rapid micromixing is realized in the synthesis of nanometer particles, and barium sulfate particles with the average particle size of 37 nanometers are synthesized. The reactor has the advantages of simple operation, low operation cost, and large treatment capacity, and has good application prospect in the industrial production relating to the rapid process.

Description

technical field [0001] The invention relates to a micro-reactor, especially a membrane-distributed micro-channel reactor, which is used for chemical reaction process and nano particle preparation. Background technique [0002] Since the 1990s, an important trend in the development of natural science and engineering technology is to move towards miniaturization, especially the development of nanomaterials, which has aroused researchers' great interest in small-scale and fast processes. Microreactor generally refers to a small reaction system manufactured by micromachining and precision machining technology. The microchannel size of the fluid in the microreactor is on the order of submicron to submillimeter. [0003] For liquid or gas phase mixing processes, molecular diffusion is the final step in the mixing process. According to Fick's law, t~d 2 / D, where D is the diffusion coefficient, d is the characteristic scale of diffusion, and t is the mixing time. It can be seen ...

Claims

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Application Information

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IPC IPC(8): B01J19/00
Inventor 陈建峰余文邵磊李敏王琦安王洁欣初广文
Owner BEIJING UNIV OF CHEM TECH
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