The ultrasonic extraction equipment has high efficiency. Based on the original ultrasonic dynamic extraction machine, this equipment optimizes the product structure and integrates the small vacuum decompression concentration equipment into this equipment, so that the production processes such as ultrasonic dynamic extraction, extraction, filtration, decompression concentration and essential oil condensation can be completed in one step, greatly saving raw materials and working time, The working efficiency is about 300% higher than that of general multifunctional extraction equipment. Reducing the extraction temperature by 20 ~ 30 ℃ is conducive to the extraction of volatile components, reduce the content of impurities and reduce energy consumption.
The ultrasonic extraction equipment can add a separate essential oil collector and separator according to the actual needs of customers. The ultrasonic extraction equipment has an exquisite structure and gives full play to the characteristics of ultrasonic energy concentrating generator. Ultrasonic directly acts on materials, and uses ultrasonic to strengthen the mechanical effect, cavitation effect, local high vibration, high impact and high sound pressure shear effect of traditional Chinese medicine extraction, Compared with the traditional method, the extraction time is greatly shortened by more than 4 / 5, and the processing capacity of raw materials is large.
When the high-energy ultrasonic wave acts on the extraction medium, when the vibration is in a sparse state, the medium is torn into many small holes by the natural product extraction equipment. These small holes are closed instantaneously, and when closed, an instantaneous pressure of up to thousands of atmospheres is generated, that is, cavitation phenomenon. The strengthening effect of ultrasonic on the extraction and separation of various components mainly comes from its cavitation. The great pressure generated by the bursting of small bubbles in cavitation makes the rupture of the cell wall of the broken object and the whole organism complete in an instant, which shortens the crushing time. At the same time, the vibration generated by ultrasound strengthens the release, diffusion and dissolution of intracellular substances, which can significantly improve the extraction efficiency. Ultrasonic crushing process is a physical process. There is no chemical reaction in the process, and the extracted bioactive substances remain unchanged.
When cavitation occurs, a series of dynamic processes such as oscillation, growth, contraction and collapse occur in the micro bubble core in the liquid under the action of high-intensity ultrasound. At the same time, in a very short time of collapse, high temperature, high pressure, strong shock wave and micro jet with a speed of more than 400km ö h are generated around the cavitation bubble, which peel off the solid surface Concave erosion and comminution create new active surfaces, and this interface effect increases the mass transfer surface area. The turbulent effect caused by cavitation makes the mass transfer boundary layer in the solid-liquid interface thinner, resulting in the decrease of solute concentration gradient in the interface layer, which is much faster than other methods.
The perturbation effect produced by cavitation strengthens the microporous diffusion in the solid-liquid mass transfer process, strengthens the eddy current diffusion and speeds up the extraction process. With the increase of ultrasonic frequency and extraction time, the energy accumulation effect produced by ultrasonic extraction equipment leads to the increase of extraction solution temperature. Turbulence effect, perturbation effect, interface effect and energy accumulation effect are related to the frequency, power and temperature of the ultrasonic field. In the extraction process of natural products, cell wall breaking, solute diffusion and equilibrium velocity are related to ultrasonic power per unit area, and will affect the extraction efficiency and recovery. Therefore, low-frequency high-power ultrasound is generally selected.
Although ultrasonic extraction equipment has a good effect in the preparation of small samples in the laboratory and has been widely used, especially in the processing of analytical samples, its fast and efficient characteristics have been widely recognized, the range and intensity of ultrasonic field limit the amount of materials processed each time, and the lack of effective engineering amplification means and methods limits its application in large-scale production.