Principle of microwave extraction in microwave chemical equipment

- Jun 30, 2019-

1. Microwave radiation: The microwave radiation process is a process in which high-frequency electromagnetic waves penetrate the extraction medium to reach the microtubule bundle and the gland system inside the material. Due to the absorption of microwave energy, the temperature inside the battery rises rapidly, so the pressure inside the battery exceeds the capacity of the battery wall to expand. As a result, the cells rupture, and the active component therein freely flows out and dissolves at a lower temperature. In the extraction medium. The desired extract can be obtained by further filtration and separation.


2. Microwave electromagnetic field: The electromagnetic field generated by microwave accelerates the rate at which the extracted component molecules diffuse from the interior of the solid to the solid-liquid interface. For example, when water is used as a solvent, water molecules change from a high-speed rotation state to an excited state under the action of a microwave field, which is a high-energy unstable state. At this time, the water molecules are evaporated to enhance the driving force of the extracted components, or their excess energy is released back to the ground state, and the released energy is transferred to molecules of other substances to accelerate the heat movement, thereby shortening the extracted components. The time during which the molecules diffuse from the interior of the solid to the solid-liquid interface results in several times the extraction rate and lowers the extraction temperature, thereby maximizing the quality of the extract.


3. Microwave frequency: Since the microwave frequency is related to the molecular rotation frequency, the microwave energy is a non-ionizing radiant energy, causing molecular motion caused by ion migration and dipole rotation. When it acts on a molecule, it can promote the rotational motion of the molecule. If the molecule has a certain polarity, it can generate instantaneous polarization under the action of the microwave field and perform the polarity change motion at a rate of 2.45 billion times per second. This produces vibration and tearing of the key. Cracks and collisions between particles and particles, and quickly generate a large amount of heat, causing the cells to rupture, allowing the cell fluid to overflow and diffuse into the solvent. In microwave extraction, the difference in the ability to absorb microwaves allows certain regions of the matrix material or certain components of the extraction system to be selectively heated to separate the extracted material from the substrate or system into smaller media. The conductivity of the extraction constant and the microwave absorption capacity are relatively low.