Supercritical fine particle preparation device_Supercritical fine particle preparation device and equipment

%> : :r> >Supercritical fine particle preparation device

: %>1. Overview:
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: %>Ultra-fine particles, especially nanometer The development of ultra-high-grade particles has become a popular field in the current high-tech industry and is widely used in materials, chemical industry, light industry, metallurgy, electronics, biomedicine and other fields. There are many ways to prepare ultrafine particles. Supercritical fluid deposition technology is a new technology under research. In supercritical conditions, reducing the pressure can lead to the generation of supersaturation, and a high saturation rate can be achieved, and solid solutes can crystallize out of the supercritical solution. Since this process takes place in a quasi-homogeneous medium, the crystallization process can be controlled more accurately. It can be seen that solid deposition from supercritical solutions is a promising new technology that can produce fine particles with very small average particles and can control their size distribution.
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: %>Several different supercritical fluid deposition technologies have been proposed, such as
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:r>2.
> : :r>Supercritical fine particle preparation device
: :r>Example process:
: r>The following mainly introduces the experimental device of the continuously operated gas antisolvent crystallization process (
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:r>). When performing
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:r> operation, use a
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:r> pump to send
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:r> to the top of the crystallizer , the pressure of the crystallizer is controlled through the back pressure valve.
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: :r>Use a cooler to cool it down to
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: :r>°C before entering the pump to prevent cavitation. The crystallizer is installed in an air bath, and its temperature is adjusted by a temperature controller, a heater and a circulating fan. The separator is installed after the crystallization kettle, and the temperature is controlled by water bath circulation. When the
> :r>supercritical fine particle preparation device
:r> system is stable, use a high-pressure pump to move the solution from the storage bottle through the nozzle into the crystallizer. The sub-millimeter suction droplets ejected from the nozzle are dispersed in a continuous medium composed of anti-solvent gas, and solute particles are precipitated due to the expansion and evaporation of the droplets. There are glass cylinders and metal filter plates in the crystallizer to collect particles. After the fluid mixture leaves the crystallizer, it is depressurized in the separator. When enough particles are collected, stop the solution supply and continue to pass
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: :r>, and use
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: :r> to remove the particles in the crystallizer residual solvent on the
< r:%> :r>Telephone:
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< r:%> :r>Mobile phone:
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< r:%> :r> Address: Donghuan Road, Puyang City, Henan Province
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:r>No.