An internal mixing supercritical hydrothermal synthesis nano-powder reactor

Abstract

An internal mixing supercritical hydrothermal synthesis nano-powder reactor, including a reaction shell with a split top cover and a bottom cover, a reaction thread channel is formed between the inner wall of the reaction shell and a threaded sleeve, and the threaded sleeve is embedded The outer threaded matrix forms the thermal insulation water screw channel, and the top of the reaction shell is provided with a mixed matrix, and the mixed matrix is ​​provided with a supercritical water inlet channel, a material inlet channel, a thermal insulation water inlet channel, a mixed straight channel and a connecting channel 1, and the bottom of the mixed matrix A dispersing cone is set, and a conical mixing channel is formed between the two. The outlets of the supercritical water inlet channel and the material inlet channel are collected in the mixing straight channel, and the outlet of the mixing straight channel is connected with the cone top of the conical mixing channel, and the conical mixing The bottom of the channel communicates with the top of the reaction threaded channel through connecting channel one. The invention can increase the flow rate and degree of turbulence of the fluid, improve the stability and economy of the system, realize efficient mixing and prevent agglomeration, and accelerate the industrialization process of SCHS technology.

Description

technical field [0001] The invention relates to a device used in technical fields such as energy, chemical industry, and synthetic materials, which can efficiently mix and improve efficiency, and particularly relates to an internal mixing type supercritical hydrothermal synthesis nanometer powder reactor. Background technique [0002] Nanotechnology is the most promising cutting-edge advanced technology in the 21st century. It has unique electrical, thermal, magnetic, optical and mechanical properties. The application of nanomaterials has triggered a revolutionary technological breakthrough in the field and has extremely bright application prospects, and the preparation of nanomaterials is the foundation and core of nanotechnology. [0003] Supercritical hydrothermal synthesis (SCHS) refers to that in a supercritical water environment (T>374.15°C, P>22.12MPa), due to the extremely low solubility of metal salts in supercritical water, rapid hydrolysis and dehydration re...

AI Technical Summary

Problems solved by technology

[0005] At present, most of the reactors used in continuous supercritical hydrothermal synthesis are tubular reactors combined with three-way mixers or countercurrent mixing reactors, but their technical problems include: (1) supercritical preheating water will inevitably The temperature is lowered by the heat absorption of the reaction fluid in the tube, the temperature cannot be maintained, and it may not be effectively injected into the low-temperature solution

(2) The reactor and the inlet are prone to particle aggregation and agglomeration, and the process pipeline will become more and more narrow and lead to final blockage, which will easily lead to valve failure and severe wear and corrosion of the components in the valve; (3) The reaction time cannot be precisely controlled , the reaction time is too long, resulting in agglomeration of nanoparticles during the growth process, producing products with larger particle sizes and reducing product quality

(4) The mixing effect of the three-way mixer is not ideal due to the low flow rate during the mixing process, while the countercurrent mixer is in the mixing process, the primary particles will be heated by the supercritical preheated water in the inner tube in the annular flow channel and easily Stagnation at right angles to exit, prone to uncontrolled thermal growth

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