A supercritical hydrothermal synthesis reaction device coupled with online ultrasonic crushing technology and its hydrothermal synthesis method

Abstract

The invention discloses a supercritical hydrothermal synthesis reaction device coupled with an online ultrasonic crushing technology, and a hydrothermal synthesis method thereof, and belongs to the technical field of chemical engineering. An ultrasonic autoclave with mature and reliable products on the market is adopted, and a pipeline of a supercritical hydrothermal synthesis reactor is placed inthe autoclave, so ultrasonic enhanced particle crushing and dispersion in the supercritical hydrothermal synthesis reaction process are achieved to obtain a product with low particle size and high value, and supercritical water in the autoclave can also serve as a heat preservation medium to prevent the situation that the product quality is affected by heat dissipation of materials in the reactorin the reaction process. Meanwhile, a plurality of pipelines are connected in parallel by arranging a flow divider, and the reaction time is controlled by controlling the total through-flow time. Theproblem that a traditional ultrasonic transducer cannot be attached to the outer surface of a high-temperature superfine pipeline of a supercritical hydrothermal synthesis tubular reactor is effectively solved, and the product quality of nano-metal powder prepared through the supercritical hydrothermal synthesis technology is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a supercritical hydrothermal synthesis reaction device coupled with online ultrasonic crushing technology and a hydrothermal synthesis method thereof. Background technique [0002] Supercritical hydrothermal synthesis technology is a green synthesis technology for the preparation of nano-metal powders. The basic principle of supercritical hydrothermal synthesis technology is to use supercritical water as the reaction medium in a closed high-pressure vessel to form nano-metal or metal oxide powder with extremely small particle size. The particles prepared in the supercritical hydrothermal synthesis process have relatively uniform particle size distribution, complete grain development, high purity, and light particle agglomeration, which can be applied to relatively cheap raw materials. Compared with traditional preparation methods, the operating cost is lower...

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Problems solved by technology

[0010] In order to overcome the above technical problems, the present invention discloses a supercritical hydrothermal synthesis reaction device coupled with online ultrasonic crushing technology and its hydrothermal synthesis method, which can solve the problem that traditional ultrasonic transducers cannot be used in supercritical hydrothermal synthesis tubular reactions. The problem of the high temperature of the device and the outer surface of the ultra-fine pipe is used

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