What is the working principle of the supercritical co2 extraction machine?

The principle of the supercritical co2 extraction and separation process is that the supercritical co2 extraction machine uses supercritical co2 to have a special dissolution effect on some special natural products, and uses the relationship between the dissolution capacity of supercritical co2 and its density, that is, the influence of pressure and temperature on the dissolution capacity of supercritical co2. This article mainly introduces the working principle of the supercritical co2 extraction machine.

The following knowledge points are listed below:

Technology principle of supercritical co2 extraction machine

How the supercritical co2 extraction machine works?

Classification of the supercritical co2 extraction machine

 

1.        Technology principle of supercritical co2 extraction machine

The principle of the supercritical co2 extraction and separation process is that the supercritical co2 extraction machine uses supercritical co2 to have a special dissolution effect on some special natural products, and uses the relationship between the dissolution capacity of supercritical co2 and its density, that is, the influence of pressure and temperature on the dissolution capacity of supercritical co2. In the supercritical state, the supercritical co2 extraction machine contacts the supercritical carbon dioxide with the material to be separated, making it selectively extract the components with different polarity, boiling point and molecular weight successively.Corresponding to various pressure range, of course, the resulting extracts are not single, but the supercritical co2 extraction machine can get the best proportion of mixture composition control condition, and then with the help of decompression, heating method of supercritical fluid into normal gas, by extraction substance is full or basic precipitation, so as to achieve the purpose of the separation and purification, so co2 supercritical fluid extraction process is made up by extraction and separation.

 

2.        How the supercritical co2 extraction machine works?

The supercritical fluid extraction and separation process is carried out by using the relationship between the solubility of supercritical fluid and its density of the supercritical co2 extraction machine, that is, the influence of pressure and temperature on the solubility of supercritical fluid. When the gas is in the supercritical state, it becomes a single phase state with properties between liquid and gas. It has a density similar to that of liquid. Although the viscosity is higher than that of gas, it is obviously lower than that of liquid.Therefore, the supercritical co2 extraction machine has good permeability and strong solubility to the material, and can extract some components from the material.

In the supercritical state, the supercritical co2 extraction machine contacts the supercritical fluid with the material to be separated, enabling the supercritical co2 extraction machine to selectively extract the components of polarity, boiling point and relative molecular mass successively.In addition, the density and dielectric constant of supercritical fluid increase with the increase of pressure in the closed system, and the polarity increases.Of course, the extractions corresponding to the pressure range cannot be single, but the best proportion of the mixture can be obtained by controlling the conditions.Then the supercritical co2 extraction machine changes the supercritical fluid into the ordinary gas phase by means of decompression and temperature rise, and the extracted material is completely or basically precipitated automatically, so as to achieve the purpose of separation and purification, and integrate the extraction and separation processes, which is the basic working principle of supercritical fluid extraction and separation.

 

3.        Classification of the supercritical co2 extraction machine

The supercritical co2 extraction machine can be divided into two types. One is the research and analysis type. The supercritical co2 extraction machine is mainly used for the analysis of small quantities of materials or to provide data for production. The second is to prepare the production type of the supercritical co2 extraction machine, which is mainly applied to batch or mass production.

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