Microporous eddy double-tube reactor and application thereof

Abstract

The invention provides a microporous eddy double-tube reactor and application thereof. The microporous eddy double-tube reactor comprises basic combination units, every basic combination unit is composed of an outer tube and an inner tube, the inner tube comprises a continuous phase inlet and outlet, one end of the outer tube is a dispersed phase inlet, and the other end of the outer tube is a closed end; between both ends of the inner tube, a group of continuous microporous arrays or a plurality of groups of discontinuous microporous arrays are distributed in the circumferential and axial directions of the tube wall, so that dispersed phase can form eddies inside the inner tube when passing through the wall of the inner tube. The microporous eddy double-tube reactor enables the dispersedphase to form eddies inside the inner tube after passing through the pores of the wall of the inner tube to strengthen mixing of process fluid, and particularly, can retard the phase separating process for processes long in reaction time. Meanwhile, the microporous eddy double-tube reactor can effectively divide the mass transfer and heat exchange process of dispersed phase and continuous phase into a plurality of different sections to effectively relieve acute heat exchange processes during process scale-up.

Description

technical field [0001] The invention relates to a microporous vortex sleeve reactor, and also relates to the application of the microporous vortex sleeve reactor, which belongs to the field of chemical industry. Background technique [0002] Regarding gas-liquid mixing, gas absorption and liquid-liquid mixing, especially the reaction of water-oil two-phase mixing or liquid-liquid mixing to produce small particles of solid precipitation, there are fluid distributors designed in literature or industry, such as using fluid distributors and mixing microchannels Combination of technologies, falling film reactor or shell-and-tube design, sleeve-type design is compact, process is simple, easy to operate and easy to manufacture (suitable for large, medium and small devices; can be used alone or integrated to form tubes), and its specific surface area / volume ratio and heat transfer coefficient are relatively high. [0003] Since the 1990s, an important trend in the development of na...

AI Technical Summary

Problems solved by technology

However, it is not possible to systematically design the size and distribution of the micropores and the injection direction of the micropores relative to the tube wall to form a vortex, and there is no specific design that can effectively decompose the mass transfer and heat exchange process between the dispersed phase and the continuous phase into several different segments. Alleviate the violent heat exchange process

2) Another type of microporous material using Teflon (such as AF-2400) is designed as a tube-in-tube reactor ("tube-in-tube reactor") after a polymer inner tube made of a variety of gas permeability but good liquid tightness, but limited The characteristics of polymer materials (temperature resistance and pressure resistance problems in large sizes, etc.) The Teflon tube used in the tube-in-tube reactor has a small diameter (for example, the outer diameter is only 1 mm). At present, only laboratory-level equipment has been successfully developed. It is only suitable for gas-liquid two-phase mixed heat exchange, and requires longer pipes to increase the flux and improve the mixing effect; the micropore size and micropore distribution on the inner tube of this type of polymer sleeve and the relative distance to the tube wall The injection direction also cannot realize the system design and form a vortex

[0004] Chinese patent 001057790 discloses a membrane dispersing extractor, which is equipped with a membrane tube or a flat membrane in a cylindrical barrel, with micropores of 0.01-60 microns on the membrane, which disperses the liquid into tiny droplets, increasing the The large mass transfer area improves the extraction effect, but the extractor is for the purpose of extraction and lacks the micro-size restriction after fluid contact, so it is not suitable for the process of rapid reaction synthesis of nanoparticles

Such as CN1318429A (CN01115332.6) a kind of film dispersion method for preparing ultrafine particles, that is, adopt this type of reactor to prepare barium sulfate particles, and disperse the sulfuric acid-n-butanol solution into tiny droplets through a microporous membrane, and then Barium sulfate particles are prepared by reacting with barium chloride solution. This patent only uses microporous membranes to limit the initial particle size of droplets, but the mixing characteristics (such as flow rate, fluid layer thickness, etc.) after fluid contact have not been compared. Good control, so the particle size produced is relatively large (average particle size is 1 micron)

[0005] In summary, the sleeve-type microchannel mixers or reactors reported in the literature or commercially available at present, whether they use sintered metal or wire mesh microporous membranes or use special polymer microporous tubes, generally can only be fixed in the circumferential direction of the tube wall. The jet flow is formed uniformly or randomly in the range, and it is difficult to design the system for the size and distribution of the microholes and the jetting direction of the microholes relative to the tube wall to form vortices and turbulent flows

The casing micro-mixer made of polymer microporous tube is only suitable for the gas-liquid mixing process and the scale is limited; the casing micro-mixer made of sintered metal or wire mesh can also be used for liquid-liquid emulsification or liquid-liquid formation Solid precipitation to synthesize micro-nano particles, but there is no additional mixing means in the annular channel. For the reaction process with a long reaction time, phase separation may occur. For the strong exothermic process, there may still be instantaneous hot spots during the process amplification process.

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