Membrane dispersion type micro-channel reactor

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 ...

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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 the sulfuric acid-n-butanol solution through the microporous membrane into tiny droplets, and then react with the barium chloride solution to prepare barium sulfate particles. This patent only uses the microporous membrane to The initial particle size of the droplets is limited, but the mixing characteristics (such as flow velocity, fluid layer thickness, etc.) )

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