Methods involved in ultrasonic crushing extraction

Extraction of natural ingredients: the energy coalescence of ultrasonic cavitation produces local high temperature and high pressure, which can break the cell wall, shorten the extraction time, reduce the extraction temperature and reduce the amount of extraction solvent. The extraction rate of ultrasonic extraction of Chinese herbal medicine increased with the increase of ultrasonic time. When the time increased to a certain extent, the extraction rate increased slowly, but decreased after reaching the critical point.

Leaching: ultrasonic wave can change the surface properties of solid particles and destroy the passivation coating, so as to promote the leaching reaction of the leaching agent, strengthen the soaking efficiency and shorten the soaking time

Flotation: ultrasonic wave can change the particle size, surface activity and dispersion of flotation materials, and can improve the flotation speed.

Electrodialysis: ultrasonic can also play a role in electrodialysis separation.

Membrane separation: ultrasonic wave can improve water permeability and salt permeability of cellulose acetate membrane, improve microfiltration efficiency, reduce membrane surface attachments, and reduce energy consumption of microfiltration pump. However, excessive sound power will affect membrane life, so it is necessary to select appropriate sound pressure and frequency range.

Precipitation: at the initial stage of precipitation formation, ultrasound can break large ice crystals, which is conducive to crystal growth and accelerate precipitation. In the process of precipitation and aging, the ultrasonic wave collides violently and the adhesion becomes larger, which can play a role in coagulation and accelerate the sedimentation.

Crystallization: ultrasound can affect the crystal growth of supersaturated solution and the crystal structure during crystal solidification. Cavitation can adjust the crystal size distribution during initial nucleation to produce more secondary nuclei, making crystallization easier and faster, thus improving efficiency.